DIY sonar scanner (practical experiments)

Рет қаралды 1,035,419

Күн бұрын

Starlink, Medical Ultrasound, 5G and my DIY sonar scanner have one thing in common: Phased arrays. Phased what..? My practical experiments convey the physics behind the manipulation of waves in a playful manner. The result is a real DIY sonar scanner. Check it out!
Give my sponsor Aisler a try: aisler.de
My board: aisler.net/p/QYYBVKUH
Browser based simulator: www.shadertoy.com/view/NdXfDl
Scanner code: github.com/bitluni/SonarScann...
Links to parts and tools (affiliate links):
4 Channel Mosfet Switch: aliexpress.bitluni.net/4chMosfet
Solenoid: aliexpress.bitluni.net/solenoid
Soldering iron: aliexpress.bitluni.net/TS80P
Miniware Hot Plate: aliexpress.bitluni.net/hotPlate
Flux: aliexpress.bitluni.net/flux
Syringe Pusher: aliexpress.bitluni.net/pusher
Variable Power Supply: aliexpress.bitluni.net/kjsPSU
Arduino Nano clone: aliexpress.bitluni.net/nano
ESP32 Mini KIT: aliexpress.bitluni.net/ESP32mini
Mini Breadboards: aliexpress.bitluni.net/miniBr...
My camera and lens (4k 60fps): amazon.bitluni.net/gh5
Github Sponsors: github.com/sponsors/bitluni
Patreon: / bitluni
Channel membership: / @bitluni
Paypal: paypal.me/bitluni
Twitter: @bitluni
Discord: / discord
0:00 Intro
0:32 Ultrasonic sensor basics
1:52 Phased arrays
2:26 Water wave experiment
3:11 Phase simulation
5:02 Starlink
5:44 Medical ultrasound
6:07 Mechanical phased array experiment
7:55 Ultrasound array design
8:20 Sponsor: Aisler
8:58 Array assembly
9:57 Software
10:38 Visualization CNC experiment
12:29 Sonar build and results
Media sources:
• Hackaday Supercon - HunterScott : Why Phased Arrays are Cool ... • Hackaday Supercon - Hu...
• Wikipedia - Phased array: en.m.wikipedia.org/wiki/Phase...
• Hearing frequencies: anatomypubs.onlinelibrary.wil...
• Demi, L. Practical Guide to Ultrasound Beam Forming doi.org/10.3390/app8091544
• Starlink auto-adjust - Simon Miller • Starlink auto-adjust
• Starlink Teardown: DISHY DESTROYED! Ken Keiter • Starlink Teardown: DIS...
• Antennas - Matthias Groeneveld on Pexels
• Starlink Tracker 1: starlink.sx/
• Starlink Tracker 2: satellitemap.space/
• Starlink cats - Aaron Taylor / 1476985855981993984
#electronics #maker

Пікірлер: 1 700

@stevejohnson1685 11 ай бұрын

I worked for a medical ultrasound company in the late 1980s, where we did phased array beam steering with very elaborate FPGAs, DSPs, and only the very highest level processing with general-purpose microprocessors. Staff was dozens and dozens of very talented electrical engineers and programmers. What you've done by yourself with just a contemporary microcontroller is extremely impressive!

@MrScooter46290 7 ай бұрын

Great comment. This is incredible.

@mphRagnarok 6 ай бұрын

Well he's standing on the shoulders of hundreds of thousands or millions of engineers and corporations that made all the ready to use tools he's using...

@tessierdsl 6 ай бұрын

@@mphRagnarokWell, you use the same engineers to write condescending comments... 🤷‍♂️

@lokeshchandak3660 6 ай бұрын

@@tessierdslIt does not read as condescending to me.

@Out_of_order 6 ай бұрын

You should make some videos about your experience what you have done in the past

@AppliedScience 2 жыл бұрын

Really really nice work!

@joseparedesalbuja8293 2 жыл бұрын

You are like twin brothers. Thank you for the many amazing vídeos. Greetings from Ecuador

@Timsturbs 2 жыл бұрын

@@joseparedesalbuja8293 Escuchame!!!

@PilotPlater 2 жыл бұрын

I knew I'd see applied science in the comments!

@Scrogan 2 жыл бұрын

Inb4 phased X-ray array

@Reth_Hard 2 жыл бұрын

Yeah! I already watched a video about Starlink's phased array but this one really made me understand how it works!

@JohnBysinger 2 жыл бұрын

I don't comment often, but man, after two decades working in cellular wireless data network engineering, this is the best phased array explanation I've ever seen. The visualization you did, the solenoids in water, the pick and place plotting, and the overlay at the end each by themselves were awesome. But showing all three was just amazing. I've tried to explain this to peers on numerous occasions and it's a difficult concept to grasp without seeing it. Very well done.

@KhaladFaraday Жыл бұрын

Yes.

@sentiparole1165 Жыл бұрын

@@KhaladFaradayIndeed

@danoneill8751 7 ай бұрын

Funny thing: having only ever seen this one explanation, my reaction to your comment is: nah, you're clearly not so bright, its a very simple idea. I feel robbed of the experience of reading about it in a physics or engineering textbook, being flummoxed and then finding this superb, absolutely excellent video.

@JohnBysinger 7 ай бұрын

@@danoneill8751 I've been working with it in practical application long before it made it into any textbooks. Frankly if it is in them now, I'm impressed, usually engineering texts lag a good decade or two behind current tech. We were testing 5G phased array hardware in 2014-15 and planning for it around 2010. So yes, a video like this would have been immensely useful a decade ago. Oh and often the simplest of ideas can be both completely non-obvious and even difficult to explain to an audience that's never been exposed to it.

@ryaneGT 5 ай бұрын

@@danoneill8751 such an interesting point! I have also spent a lot of academic and professional effort as an engineer trying to understand phased arrays and agreed this video does it better than anything I've encountered so far! Would love a better explanation from a signal isolation/receiving perspective as much as the beam forming.

@quetzalcoatl-pl 2 жыл бұрын

As a professional programmer, I really love your 'coding' intermissions xD the one with drill and glove was hilarious!

@pskcalvo Жыл бұрын

After almost 40 years coding I found my lifetime goal... I want to type like him !! 🤣

@markgoogolplex2572 Жыл бұрын

I've tried all of them but much prefer the roller pin method. It seems slightly faster than the glove-drill with less strain on the hands.

@Sylfa Жыл бұрын

I'm just glad he didn't resort to cookie cutters, that would really take things too far…

@Albtraum_TDDC Жыл бұрын

@@pskcalvo chatGPT got you covered now.

@denizcancgsar2810 7 ай бұрын

Roller is my favorite.. xD

@antonmilosevic 2 жыл бұрын

I have to say it. THIS IS YOUR BEST VIDEO EVER. I was kinda getting sad that you didn't upload that frequently anymore, but the wait was well worth it! Hut ab mein Freund :)

@magge7910 2 жыл бұрын

Can only underline that. So good. Well done.

@Francois_Dupont 2 жыл бұрын

i agree

@mayankraichura 2 жыл бұрын

Totally agree 👍🏻

@Mr_Ponzo 2 жыл бұрын

Me too

@maicod 2 жыл бұрын

I guess the low frequency lies in the fact there's so much pcb waiting time and video segments filming and testing etc. etc. time needed

@thethoughtemporium 2 жыл бұрын

That was absolutely outstanding. Incredibly good job! Very cool project

@mrbane2000 9 ай бұрын

You two guys have so much knowledge and put up effort, i subbed you both. This guy put effort even in analyzing beam and having simulation. Props to you

@Nets-nutsBr 5 ай бұрын

13:48 - "Let me display the sonar as an overlay": Blew my mind. I understood how it works. Tks

@amazing763 Ай бұрын

Same technology used at the lab where I worked 50 years ago to steer seismic arrays, spread out over hundreds of miles, to locate earthquakes. Obviously can't pick up seismometers and move them about, but phased array math does it just fine. Good collaboration of geophysicists and electrical engineers.

@Maxjoker98 2 жыл бұрын

Wow, you visualizations are top-notch! The best visualization I've seen on the subject, and mostly practical too!

@kennethhicks2113 2 жыл бұрын

I agree, was introduced to pesa in 80's and the water demo is the best I've ever seem to demo.

@subminuentisch 2 жыл бұрын

I never comment on KZfaq but that reminded me of a little visualizationproject i made a while back i never published it though. When i saw 3:13 i thought how the hell did he get his hands on my private videos. If you are interested i just unprivated all the related videos i have. Includes PAR dipole and singlepoles and some other stuff.

@subminuentisch 2 жыл бұрын

Also when i realized back then that em waves pretty much behave like water waves a lot of things became way more intuitive so that water experiment was pretty good

@sumduma55 2 жыл бұрын

@@subminuentisch back in the 90s, I was experimenting with much similar techniques but my goal was to isolate sounds within a crowd of noises. Of course I was severely limited on processing power and it didn't go far outsideof some limited success with tones. I hear that in the mid 2000s, somebody created an algorithm that was way more efficient. Anyways, I'm pretty sure the same effects can work backwards where an aray of sensors can be used to pick the same wave anomaly from natural sounds or even a focused beam like this returning. I used recordings to vary the timing in playback of three to six microphones placed a few millimeters apart to isolate waves from specific targets. I think this can be done in real time today to discriminate the sonar response to just the target area increasing the resolution somewhat significantly. I haven't played in this arena in a long time. My memory could be rusty on it. I'm just tossing it out there in case anyone else might be interested in taking things further.

@bardenegri21 2 жыл бұрын

Holy production quality batman! Good job and it was real fun watching you toil over this project on livestream.

@ted_van_loon 2 жыл бұрын

now just wait untill he makes a headband with frequency controllable vibration actuators so he can feel what the scanner scans. so he can literally see like badman(or feel), and even see/feel behind objects.

@djdurban3294 2 жыл бұрын

If you have taught yourself about phased arrays and gone on to develop this experiment without help from anyone else then I truly admire you. This is brilliant work. 👏🏽

@janlinzmaier2930 11 ай бұрын

Finally someone with a local pcb manufacturer as sponsor instead of a chinese one.

@MrTegidTathal 2 жыл бұрын

Very cool! You can actually use alternating scan rates to see further than your sample rate. Assuming you are scanning/listening constantly (so you transmit a pulse, wait to receive for t time then transmit again exactly when that time is over) you are actually seeing distant items in your near field as their echoes are still returning to your receiver (2t period). The only time you cannot hear them is during the transmit period. If you alter the scan rate, you can cohere them together (only the coherent signals will add up) over time and extend your physical scan distance. The different transmit rates are effectively a distance phase.

@jamesbaker7112 2 жыл бұрын

I helped remove the sonar transducers from USS Fox CG 39 during an overhaul in '89. It took two men to lift them. They were covered in sharp cooling fins and there was no good way to hold them. We had to carry them up six decks of ladders, the length of the ship to the quarterdeck and down the gangplank to a truck.

@markb1911 Ай бұрын

This just blew my mind. Everything about it. The Presentation, examples, explanation, shots, editing, and method used to impart understanding on this topic are just… It’s just art at this level. also… The rolling pin got me.

@paulatreides6779 Жыл бұрын

Your effort in making this, from the device design itself to the video filming/editing is OUTSTANDING!

@HennerZeller 2 жыл бұрын

Really well done, in particular the effort that went into explaining phase arrays on a level better than most science communicators would do. Happy beamforming!

@Ry_TSG 2 жыл бұрын

this is legitimately the coolest DIY project I've ever seen. I've seen the videos of the little Arduino sonar projects that rotate back and forth like old fashioned radars, but to see a demonstration of a modern phased array radar using the same method is absolutely amazing.

@bobrowland6936 Жыл бұрын

Great demonstration! You did an outstanding job using water waves to show wave interference patterns. Back in 1985 I was using ultrasonic transducers similar to the ones you are using to create a binocular sonar system with a single transmitter and two receivers. Unfortunately, I did not realize how large the amplitude of the sonar signal was and over a single weekend I damaged my hearing. That was a real bummer and I stopped working with ultrasonic transducers. But about ten years ago I started working again on a binocular sonar system for my robot. This time my transmit level is much lower. It took me a while to create the algorithms to correlate the two echoes, but after a couple years I now have a working binocular system which can map object ( X & Y) six feet in front of the robot within a +/-15° cone. The accuracy is better than I expected, about +/-3.5cm.

@kierancampbell3322 Жыл бұрын

Apart from being a great explanation of phased arrays, the production quality is awesome in its own right. The visuals, including overlaying the dolls, are so good! And I too enjoyed the coding 'methodologies' :) And the reversing skit!

@peterbonham5540 2 жыл бұрын

As an aircraft avoincs apprentice in the 70's I worked on weather radar systems that had multi KW magnetrons, physical wave guides and mechanical dishes that swept an arc. At that time the new tech stuff was coming in with phased slot arrays, gunn diodes and digital signal processing. Absolutely mind blowing shift in tech. Got a lot of redundant really strong magnets out of it though.

@robwilton9539 2 жыл бұрын

The Sonar 195M wasn't new then Pete, it was invented in 1935 if my memory serves me correctly. It was probably the first phased array device ever.

@muniswamy100 2 жыл бұрын

bro, you nailed it, synthetic aperture sonar theory and working in under 15 mins. great apprecciation for all the deligence put for making this amazing video.

@TheRationalPi 2 жыл бұрын

Did I miss the part where he used a synthetic aperture? He certainly *could* have done it with CNC, but I don't think he did.

@muniswamy100 2 жыл бұрын

@@TheRationalPi, well, he wasn't specific about synthetic aperture, but i felt the video basically conceptualized it. However, for Synthetic aperture, the array needs to be moved.

@TheRationalPi 2 жыл бұрын

@@muniswamy100 I think he stayed pretty specifically on phased arrays. It would be really cool to see him go back and do some synthetic aperture stuff with that CNC though. He could hook the rig from the end of the video to it and get some really great resolution out of it!

@muniswamy100 2 жыл бұрын

@@TheRationalPi i'd love to see that. Above all, video was highly educative..

@tymofiichashurin1602 Жыл бұрын

This is precisely the density of information, which nearly every course should have. It is a lot of work has been done and that is why it is such a cool and concise explanation. Thank you for that! :)

@PabloMayrgundter 2 жыл бұрын

Great work! An idea: since you have a closed loop testing rig, maybe you could tune the emitters with a matrix of weights. For each sensing location record the decibel level, with perhaps a bit of modulation of each emitter's output level. let's say you expect to receive X dB at that point, and you vary emitter A +- 5 dB, but only record -4.8 to +4.7, you can then correct the power output on each to reach the desired output. Repeat this for each emitter, so you have a vector of tuning weights for the target location. Repeat that yet again for each target location (could be 1, 2 or 3 dimensions). So you end up with a calibration matrix and can use it to precisely tune the emitted waveforms to have more consistent power densities where your beam intersects the target, and so a more consistent return to analyze and then a higher resolution display result. Maybe :)

@joshielexable Жыл бұрын

Genius...

@rammss 2 жыл бұрын

I'm amazed by your roller coding skills xD

@MattAtHazmat 2 жыл бұрын

Long time ago, I tried to build something similar- the biggest issue with doing a phased array like this is the sidelobes. You really need some small transducers- if memory serves (without my handy copy of Skolnik's Radar handbook nearby), best spacing is about 0.7 of the wavelength. without that kind of spacing, the sidelobes (things outside the 60 degree sweep) have nearly as big a return as the objects within the sweep. Your simulation seems to show this? What may get you even better resolution is a Synthetic aperture setup (SAR, or sidescan sonar) Cool thing about SAR is that you can do it with an FFT. At 40KHz, you need about 5mm spacing. Way smaller than any transducers I could source at the time (25ish years ago). Mind you, I did this with a PIC16C71 (UV Eraseable!) that has 288 BYTES of RAM and an 8 bit A/D converter, and all in assembly! You can do a variant with a "zig-zag" of the transducers so at least in the far field, the spacing is pretty close and you can reduce the sidelobes. Worked on it for a bit but... LOOK A SQUIRREL!

@firstmkb 2 жыл бұрын

Amazing work! I am burdened by so many herds of SHINY squirrels, so I have never gotten that far. This does reawaken my desire for an open source sonar for pleasure craft. I don’t want to spend $1,000 for a commercial system OR run aground!

@upendrahatiya5686 2 жыл бұрын

well side lobes can be reduced by using amplitude control as well with phase control in a binomial distribution. this way one can significantly reduce side lobes but with a cost of directvity.

@MattAtHazmat 2 жыл бұрын

@@upendrahatiya5686 Huh? modulating the phase is exactly what is happening here- and the directivity is reduced exactly because of the sidelobes. Directivity is exactly the parameter that this setup lacks. I believe what you're talking about is the cross range apodization in a focusing sense. Still, you need to get the individual elements much closer together- shorter than a wavelength.

@MattAtHazmat 2 жыл бұрын

@@firstmkb thanks. A side-scan sonar is *relatively* straightforward math. You make a 2D array of your data- for example columns are individual readings, increasing in time as you (radar speak: "range bins"). Take time domain measurements at a regular (distance/cross-range) interval. Do an FFT across the rows ( the same "range" bins, but differing in cross range): BAM. the output of your FFT is your synthetic aperture at that range. It took me a while to catch on, with the help of some very smart radar engineers, but the "focusing" is done with well established algorithms.

@jtjames79 2 жыл бұрын

@@firstmkb I remember reading an old story about how maybe seals use an array of electrodes on their tongues connected to sonar. Back then the hardware was ridiculously expensive (particularly processing power), bulky, and power hungry. I want to use this technology to create "sonar" for the blind. So I would also mix in radar, IR, visual spectrum, etc. So you could switch around like predator vision. So even non-disabled could use it like let's say an electrician, who could then walk into a room and sense any shorts. Or IR so fireman can sense the strength of flames that they can't see. Etc.

@CarlMahnke 2 жыл бұрын

The work you put into this is insane.

@markTheWoodlands Жыл бұрын

Excellent combination of theory and practice. This is the best introductory tutorial on beamforming that I have seen to date.

@rayh594 2 жыл бұрын

You can probably improve this a lot by transmitting using CDMA, such as using Gold sequences that are mostly orthogonal. Then you don't have to wait for the echo of a pulse before doing the next one. You can just step through Gold sequences and decorrelate them in the receiver. You need good linearity on the receiver + rx amplifier to do this. The echo delay does not have to limit your update rate at all.

@linhthai75 2 жыл бұрын

I second motion this comment, and hope your comment would reach the author of this video. But, after a little thought I think this quite a tall order. As for such develoment attempt CDMA+PhaseModulation would required RF and digital engineering skills (ie. VHDL/Verilog for the FPGA). CDMA is one of the coolest tech this century, so cool that everyone ran off and bought a +$USD300 piece of CDMA eleclectronic and stuff it in our pant pocket, every other year.

@rayh594 2 жыл бұрын

@@linhthai75 There is no need to go the lengths you are talking about. The transmit waveform could be generated using an SPI port and a shift register (74HC595 is around 30c for one), so that is very easy. Shift rate would be 40kHz times 8, but PN sequence data rate is still 40 kbits/sec. The ESP32-S3 has two CPUs, so one could be used for transmit, but honestly it could be easily done using 1% of a CPU, or the low power IO CPU in the ESP32. Then, suppose that one measurement normally takes 100ms, to speed it up by 8, we'd use 8 Gold sequences, and transmit them in sequence, for 12 ms each. The, we'd collect data at the normal rate, but correlate it in software with the gold sequences. The sequences would overlap in flight, but would not overlap during transmission, so the TX circuit would be unchanged. The receive side would receive overlapping gold sequences from the last 100ms, and would figure out the time of flight using correlation. This would be CPU intensive, but I think could still be done completely in software. If one sequence is 12ms, then it has to be around 512 bits long. Correlation would be around 16 million operations, per 100ms, which I think is quite doable on the two 240 MHz LX-6 CPU cores in the ESP32. That's doing it the "dumb" brute force way. I've seen correlation sped up by an order of magnitude by using bitwise operations in a CPU followed by a bit count, at the cost of a some loss in sensitivity.

@roba2440 2 жыл бұрын

@@rayh594 the only thing you have to watch for is that the transmitter can withstand the ~50% transmit duty cycle and doesn’t melt! :)

@zaccrisp9988 Жыл бұрын

@Linh Thai Your level of understanding is great, what do you do for work?

@stevejohnson1685 11 ай бұрын

Or look at the technique that HP patented for laser rangefinders - a swept frequency transmitted, beat against the delayed "chirped" echoes. If the frequency of the sweep and the carrier frequency have the right relationship, out pops the distance.

@TheHookUp 2 жыл бұрын

Saw you previewing this in the last Makercast, but this turned out better than I could have imagined. Awesome project and awesome video.

@amitsci 2 жыл бұрын

What’s the makercast? Sounds like I should be attending!

@claytonhutton3695 2 жыл бұрын

@@amitsci It's on youtube. Just search there. But it's a cast of a few different people/makers going over different projects, ideas, etc. It's pretty cool.

@kelvinchow3663 3 ай бұрын

Awesome, I had a final year project for ultrasonic detection using DSP around 1996. Although I had exposure in beam forming in the later study, I stopped doing practical hardware experience after the project. I am really appreciate of what you did. Indeed this is what I want to start again. Your inputs and materials should be valuables resources that I can start again.

@sandman94 Жыл бұрын

The amount of work that went into this video... Just wow.

@o0julek0o 2 жыл бұрын

The glove+drill coding really got me.

@taterbits 2 жыл бұрын

This is an awesomely made and put together (edited) video. Very well done mate. Two thumbs up!

@dsuess 2 жыл бұрын

Mind blown!! This is truely amazing to see how you broke down a complex topic into something more simple. You sir, are an amazing engineer. Thank you for sharing!

@pronouncedoiler7193 2 жыл бұрын

I'm a medical ultrasound researcher, and this is a really good primer on beamformation theory without digging into the math. Though in medical ultrasound "phased array" means an array with at most half wavelength spacing, I understand radar guys are a bit more liberal with the usage. Still, it's important to know that this is just the tip of the iceberg. This is just fixed transmit steering for narrowband signals in the far field with fixed weights. Dynamic nearfield focusing of broadband signals in both transmission and reception is standard operating procedure these days, and there is a ton of nuance in optimizing the parameters. Also, your main sidelobe bottleneck here is your grating lobes, which are the result of the transducer spacing. Those cannot be easily tuned on the fly, and thus are critical hardware considerations for the array designer. The other side lobes can be tuned by adjusting the weights before summation, which we US folks call apodization. Still this is pretty impressive for doing this on the cheap side of things. Would love to build something like this myself.

@erygion 2 жыл бұрын

This is a great video! I was laughing at the "hacking" (a rolling pin!? 🤣) and besides that the information was very interesting and well explained with visuals. I've never seen ultrasonic sensors set-up like this, definitely new to me and I just made a "radar" using two servos but THIS is 5 levels next level, I had no idea you could have control like this... and how it's done, fascinating! Very well done but that's no surprise coming from you.

@jafinch78 2 жыл бұрын

Will be interesting to see if bitluni advances the development into a cost effective larger array like the transducer array boards used in the Soundlazer. There is more that can be done with these for directing ultrasonic beams as well as detecting also. I actually thought he was going to make a synthetic stone skipping effect on water at first... of course only with the sound beam and not a stone. Surprised actually he didn't focus an ultrasonic beam on water... then I thought about and this is more for the specific application. Was thinking he can use an array for detecting and emitting.

@samarpan.das. 2 жыл бұрын

This video is too good. Well produced and scientific. 🔥🇮🇳

@danriches7328 2 жыл бұрын

Could not have said it better myself!

@geoffscott265 2 жыл бұрын

I had always put phased arrays in the "too difficult for me" camp. Thank you for a wonderfully straightforward and easy to understand explanation. You can't put a price on this kind of teaching skill ...well you probably can but I'm not paying it 😀 Seriously though, great video (I did LOL a couple of times) and your project was brilliant.

@lloydrmc Жыл бұрын

Subscribed. I appreciate the high quality, thematically representative music, and the zany keyboard manipulation cutaways.

@PrashantKarade85 2 жыл бұрын

This visualising of phased array is amazing. I've worked with antennas but never thought it can be implemented with ultrasonic sensors. Great work 👏

@Nicolas_dG 2 жыл бұрын

The quality of this video is amazing! A real pleasure to watch :)

@ronidaffan5904 Жыл бұрын

Wow !!! The most comprehensive video about phase array by far !!! Weldone !!!

@NorroTaku Жыл бұрын

The water was just killer production effort Loved it Very satisfying video Super informative Also the overlays and editing was top

@viniciusfriasaleite8016 2 жыл бұрын

What a good video! To make something similar, I would use an array of receivers and measure the direction of arrival like an automotive radar. It's probably faster, but needs more signal processing and signal modulation. Take a look at FMCW radars!

@maicod 2 жыл бұрын

ofcourse it triggers my curiosity. You are a real master making and especially clearly explaining it all ! Thanks Bitluni, this video deserves a large audience !

@Audio_Simon 2 жыл бұрын

As someone who plays in acoustics and electronics this video impressed me so much! The content is great but the production is amazing too! 👏

@Fabri91 2 ай бұрын

Instant subscription, with the bell and everything. Interesting and accessible topic, insane production quality, and the best coding technique I've ever seen (powerdrill with gloves is the future).

@DantalionNl 2 жыл бұрын

Intuitive, easy and effective. This could have many applications such as passive non-intrusive presence detection and crowd estimations. In this field I believe it to be highly important to perform the detection without using cameras for obvious privact reasons.!

@JBrierley02 2 жыл бұрын

This is fantastic. Well explained, extremely well illustrated, with excellent working examples and perfect pacing. I wish all such video’s were as good!

@gmag11 2 жыл бұрын

The way you visually explain this topic is wonderful. My congratulations

@IndependentNewsMedia 2 жыл бұрын

A method of improving the the resolution is to place a cone in front of the receiving sensor, as the transmitters can cause interference due to their close proximity, a second method is to have a transmit, receive, sleep cycles, transmit short burst e.g. 100ms and during transmit period the receiver is switched off, and then receiver switched on period 50ms and the transmitter is switched off, and and third period both transmitter and receiver switched off 20ms (sleep cycle save battery), varying these parameters can set the distance of detection. Please also be a ware the weather effects detection distance and resolution, on damp days speed of sound varies, in fog the transmissions are dispersed, and in heavy rain or snow false triggering. This method is utilised in the Railway industry to detect a train has stop in a platform. Great video, keep up the good work. 👍

@TorbjrnViemNess 2 жыл бұрын

Really cool project! I made a single transmitter ultrasonic ranging system once, and there's one more trick you might want to consider implementing (if you haven't already) for better sensitivity along the sensing range: make an adjustable gain for the receive amplifier and program that with the controller (I used a JFET as one of the resistors in an opamp circuit and had a filtered PWM signal to drive the gate, but other solutions might exist). That way you can start out with a low amplification (to avoid saturation and picking up unnecessary noise for close ranges) and gradually increase it as the sound waves travel to increase range.

@Farming-Technology 2 жыл бұрын

This is amazing. Your proof of concept at 7:00 was more effort than some put into a whole video. Subbed!

@MikeDQB 2 жыл бұрын

I had a basic understanding of how this worked before this video... Your visualizations really helped it sink in and I feel like I have a much greater understanding now. Thank you!

@michaelbishton9439 2 жыл бұрын

I appreciate the time and effort you put into explaining and visualizing phased arrays. This is an outstanding production on many levels.

@nenioc187 2 жыл бұрын

Excellent video! And as a programmer, I can tell: yes, that's exactly how we program stuff! ;-)

@quetzalcoatl-pl 2 жыл бұрын

Yup. Totally. And when we "go for a lunch break" we really are just taking our time to recharge drills' batteries.

@mattstaab6399 Жыл бұрын

i suprised he decided to show all his time spent programming, most people skip it

@tommysecondspace6977 2 жыл бұрын

Great video! The amount of work that went into the projekt and the video really shows. It is fascinating to me how all the little parts and projects, the 3d printing, the cnc, the micoprozessors, the programming come together and we are able to create something like this on our own.

@MikePorterII 2 жыл бұрын

I can't say thank you enough. This was such a hard concept to grasp without being able to visualize it. Thank you so much for what had to be quite the labor of love to make this!

@marsvandeplaneet7786 2 жыл бұрын

Currently I;m working on placing muliple type of sensors on my rc truck.Your 'array story' gives me a whole mew dimension. Tnx a lot!

@alexkram 2 жыл бұрын

This is amazing! Super impressed with the engineering and especially the visual displays. I have never known about your channel before but I am an instant subscriber. The automated coding with rolling pin, etc is freaking hilarious too.

@73Ferret Жыл бұрын

Really interesting - I used to work with underwater survey systems and when multi beam echo sounder came along they changed what was possible on a massive scale. An imaging sonar system I worked with later had 56000 beam elements…

@RADARTechie 3 ай бұрын

I am an IFF technician and use phased array every day. I love this technology.

@ClaymateDesigner 2 жыл бұрын

That's the best explanation of a phased array I have ever seen. Well done...

@mpja 2 жыл бұрын

This video really impressed me! It was a great demonstration of applied physics to solve a problem. The visualizations were also great to watch.

@ClokworkGremlin 2 жыл бұрын

The fact that the phased array allows you to move the beam without needing any moving parts (besides the transducer diaphragms, of course) is really cool. I'll have to keep that in mind for future design ideas. [edit]You could use a low-pass RC filter to smooth out the hard edges and feed the transducers with a pure sine wave. Might improve your scan quality. Might not.

@stevejohnson1685 11 ай бұрын

And further refinement by "fading in" and "fading out" the train of sine waves ("Chebyshev windowing") ...

@robiniuteee 4 ай бұрын

13 years in telco career, this was the first time actually and visually it got clear what happens in the real world. I practically was on my toe how fast i can give a compliment after watching 7 mins of the video. Great job, really appreciate

@miltonlai4850 2 жыл бұрын

I see a major commitment of money and time behind this 14 minutes video. Very good work!

@NathanOKane 2 жыл бұрын

Absolutely incredible explanation, experiment, and testing. I'm floored by this video wow!

@ArktikosAdventures Жыл бұрын

I'm so glad there are intelligent passionate people out there like you who do the things that us mere mortals could only dream of doing. You guys advance our civilization in so many ways. Thanks for a great video.

@BalefulBunyip 2 жыл бұрын

I really enjoyed this. I have wondered what phased array radar was for quite a while, your explanation was excellent. The electronic demos were cream on the cake, and every one was entertaining. Thanks again.

@88njtrigg88 2 жыл бұрын

The visuals in you're videos, make them incredibly intuitive. Thank you very much kind Sir.

@rockyhill3 2 жыл бұрын

That was amazing! I wish youtube would allow me to give you way more likes! You've inspired me to make a coding bot with a drill and a glove! Great video!

@roba2440 2 жыл бұрын

If you had an array of receivers, instead of transmitters, and used a single wide angle transmitter, you could form your beams on receive, _ in parallel_ , in software. This would allow your frame rate to be much faster, as you would be scanning all the angles with one transmitted pulse. Your frame rate would be limited to the echo return time. You would need to simultaneously capture the signal from each receiver separately.

@transient0126 2 жыл бұрын

Yes but you won’t have directional control of the pulse…this is necessary to focus the energy on all objects in front of your system. A single pulse will produce a stronger response directly in front. Not ideal.

@roba2440 2 жыл бұрын

@@transient0126 the transmitted beam pattern is the product of the element factor and the array factor. The element factor, ie the angular response of the projector must be broad enough to insonify the sector in front of you, or it wouldn’t have worked as well as it did. The array factor can only restrict the insonified sector - it can’t make sound go where the element can’t transmit but it can focus it as you said. The lack of focus from a single projector allows you to fully insonify the whole sector in front of the projector all at once - good thing, but the lack of focus also reduces the intensity on the target, bad thing - made up for by the improved receive gain reducing the background noise level. You need to think about both the signal and the noise, because it is signal to noise ratio that you need and you are detecting signal against a background noise level. It would be useful for you to measure the beam pattern of a single projector and then of your full array.

@philliprhyner850 2 жыл бұрын

Excellent work! If you switch the transmit array to a receive array and perform an FFT across the array (not time domain but the array domain at every point in time). This is closer how underwater acoustics, and likely Starlink, is done for receive 2D arrays (a 2D FFT). Your example is actually similar in hardware to most side scan sonar systems for underwater, just with piezo-ceramic transducers. The other difference is that the array is used only for receive while the single transducer is only used in transmit. The transmit transducer is meant to have as perfectly spherical beam pattern as possible. If you have the results of a beam pattern of a single transducer, you can use "window" function of the array to minimize the side lobes for both transmit and receive. One common window for acoustics is the "Hamming Window". If the transmit transducer does not have a perfect spherical beam pattern, you can modify the window to increase or decrease sensitivities at specific angle. For your inverse application, the window algorithms would improve the transmit signal. Also for the underwater acoustics realm , the shape of the piezo has direct affect on the beam pattern. Transducers used in arrays are specifically shaped like narrow rectangles. An array would look something like this, IIIIIIIIIIIII. The beam pattern coming off in the narrow width is very wide while the beam pattern coming off the wide dimension is very narrow (~ 1 degree). This is how the array can digitally process along one dimension (out lateral from the center line of a vessel), while repeat transmits and receives along the tow track at specific intervals have the high resolution along the tow track, due to the tight physical beam pattern. Having examples performed on the table create multi-path. Hanging the test in open air would improve the result, along with using a receive array normal to the transmit array. Apply a hamming window to the transmit array will create a line transmit window that would minimize multipath. Subscribed and impressed!

@melkerper 2 жыл бұрын

I'm so impressed by how he just build, prints, codes all this and it seems so easy

@zachcrawford5 2 жыл бұрын

Very cool, I wonder if having more "ears" and only one transmitter would be a better approach. Biological sonar seem to take this approach (and it seems to be very fast and accurate). Phased arrays are good for "digitally" moving a beam around, which is great for speed, if you can take advantage of it but it seems to come at the cost of more noise in the returning data since you now have to deal with the interfering information from multiple wave fronts.

@basecius 2 жыл бұрын

Yes indeed. The receiver part is a bit more complicated than the transmitter, so over all it would be a more complicated setup. But with the benefit that you could send a pulse, receive the response (keep the data from the multiple receivers separate), and then decide in what directions you want to look. I.e. many directions for each pulse. And then of course, you could have multiple Rx AND Tx. Lets say a vertical Tx array, and a horizontal Rx array. That way, you could do a full 3D scan.

@kevin42 2 жыл бұрын

One key advantage of the multi transmitter approach is that it blasts stuff with a lot higher power density, thus leading to a stronger response.

@Breeegz 2 жыл бұрын

@@basecius If you are investing in the multiple Tx & Rx, then you could decide at time of pulse which array is the Tx and which is the Rx. You could switch back and forth like the single ultrasonic sensor does, but with more channels.

@Vega3gx Жыл бұрын

@@basecius rx phased array is complicated, but not as complicated as the beam steering algorithm needed to do tx effectively. I'm not sure but I strongly suspect much of the noise and side lobes we see is due to the methods he used for active scanning. RX can all be done in post

@steve0steel 2 жыл бұрын

It would be interesting to see if a sine wave would create a clearer signal since the square wave includes multiple frequency components.

@maxhouseman3129 2 жыл бұрын

Sure. But a true sine is difficult to create digitally. Theoretically in a square wave there are infinite frequencies, practically its depending on the slew rate.

@DjWojtas1 2 жыл бұрын

Visualizations are great but sound effect and music is just sooo perfect

@Arrogan28 2 жыл бұрын

Wow, i had no idea what the deal was with phased arrays, but in one short video you opened my eyes to so much possibilities. Thank-you!!!

@EatRawGarlic 2 жыл бұрын

Very cool! I noticed Matlab has a phased array toolbox and I have been wanting to play around with that for a while myself. Looking forward to you adding the third dimension to your setup, and maybe switching to RF in time? If you get that to work, mount an array in front of a VR headset, to scan your environment and then show a 3D representation of it inside the headset.

@edward17829991 2 жыл бұрын

so coooooooool~ how about 2d array? I've learned the theory, but your execution is top-notch. It's a pleasure to watch you doing these!

@sharonbraselton4302 2 жыл бұрын

giid údeàr

@gasparem16 2 жыл бұрын

bro, this channel. I loved the representation of the waves, so clean and well explained. Cheers mate. Keep it up.

@peter.stimpel 2 жыл бұрын

Haha, I know what your neighbors are saying when you walk through the forest carrying all this gear: Look, he is now as well into finding strange energy, poor boy ... LOL. That was a fun journey.

@muriatik_ 11 ай бұрын

i learned about phased arrays in my undergrad and was just visualising it in my head the whole time, which worked for me but it's not as exciting. i've never seen a visualisation as good as this!! really makes you appreciate the physics behind the tools we use everyday.

@chase2496 2 жыл бұрын

This is so cool. I deal a lot with networking equipment so being able to visualize beam forming was awesome! Even knowing how it worked already, this video helped to fill that visualization void I was missing. Thank you for such an awesome video!

@derekerickson1992 2 жыл бұрын

This is probably the most well done video I have seen on KZfaq recently. I am not an engineer, physicist, or mathematician, but I feel like I could at least have a logical conversation with someone regarding how a phased array actually works. Excellent video!

@jaapodac 2 жыл бұрын

Consider my curiosity tickled! Thank you for an outstanding presentation. I thought I had understood phased arrays but didn't have time to experiment with my understanding and now you've done that for me. Wonderful!

@MikeNoce 2 жыл бұрын

The visual aids you used are incredible and I wish I had them when I was in engineering school. Well done. People can learn so much faster from better teachers.

@_dml Жыл бұрын

What a serious work You've put down in the pedagogics. Absolutely amazing! 👍

@mickeyfilmer5551 4 ай бұрын

I knew about phased arrays - but couldn't find ANY explanation as to how they worked-your video did that. Subscribed forever and looking forward to learning much more from you - even in my advanced age! Thank you Young Man : Sir! big respect to you!

@BrunoHenriqueMattos Жыл бұрын

How can this be a work of only one person? Incredible 😮 👏🏻

@arshamskrenes 2 жыл бұрын

Incredible video!! You had me AND my children (all way down to 4 years old) intrigued! Definitely the best demonstration of phase arrays and beam forming! Thank you!

@JustAnotherAlchemist 2 жыл бұрын

This video puts me in quite the emotional conflict. On the one hand, I get strong "they stole my idea!" vibes, even though that's, of course, totally absurd. Truly though, I must have thought this up nearly 17 years ago now, when I first heard of those cheap two element sonar range finders. On the other hand, I'm pretty ecstatic to see something I had through of years ago actually realized. It's amazingly vindicating to see an old "crackpot theory" I had was grounded in reality all along. I applaud the uploader for the fine work. On a tangential note, and something of a PSA. *Don't let pessimistic people in your life hold you back from doing something.* The primary reason I never made this exact thing that many years ago is that I had bounced the idea off a (then!) most trusted person to me, and they shat all over it; even as far as saying it was impossible. Seeing it here, now, in the flesh, I now know I could have had this with a PIC, some transducers, and about a month's worth of coffee all those years ago.

@ColdWarVet607 10 ай бұрын

Nicely done! Took a very difficult concept and factor'd it to easy to understand segments. Really well done. Thank you!

@DerSolinski 2 жыл бұрын

Hands on the best explanation on phase arrays I have seen so far. Well done, I enjoyed it.

@gregorymccoy6797 2 жыл бұрын

This is best video I've seen in a while. Love the preparation you took and the brief lesson. I think the wavelength of audible frequencies are pretty limiting but you've done extremely well.

@DaveTheYellowDart Жыл бұрын

Dude, nice job! So cool. About 15 years ago or so I built a very crude audible beamformer to play with for fun. I just used an Arduino and 10 piezo transducers that have a resonant frequency around 3 kHz IIRC, held in a laser-cut acrylic frame. I would read in the value from a pot and convert that into a desired azimuth angle, and then calculate the appropriate offset between pulses. It was a good simple project because I could drive the transducers directly from the GPIOs of the Arduino so the circuit was simple, just an Arduino on a breadboard, a pot, and then the 10 piezo transducers. (I also drove the transducers differentially, so each transducer would connect to 2 GPIOs, and I would set them to 0,1 to drive them forward and 1,0 to drive them back, doubling the amplitude compared to just on/off.) It wasn't particularly practical, it just made this annoying drone sound, but you could definitely tell that it was directional, by moving your head, or sweeping the signal. Not bad for an 8-bit processor running at a few MHz. Really awesome video, well done.