woah

Homeschooling dad here, you are an inspiration and a blueprint for my little boy.

I assume this set-up you're describing essentially destructively interferes with the carrier signal, leaving the sample signal largely untouched so instead of filtering the noise, you can simply threshold it?

@@dittilio no it's about direct cancelling the magnet field. I actually discussed the principle in a video I made some years ago: kzfaq.info/get/bejne/e8mlh9aay7nLcqc.html (around 3.50 min)

Ah, of course! Very neat idea. I think you’d need to tune each part separately, but at least that’s a lot easier than remaking the output coupling filter. Could even automate a scan using varactors, or those funky current-controlled inductors.

It's called induction balance and yes, it works.

@@HuygensOptics Oh damn! Huygens Optics stopped by! Been following your videos on the mini-monolithic telescope and those dirty lenses. Now I gotta stop by your channel and finally get around to those grinding videos Ive been sitting on watching! Love when these home science on complicated subject channels get together, it makes for an awesome community with a mix of interested amateurs fully invested in everything knowledgeable professionals have to share. And sharing the knowledge its what its all about. Thumbs up to all in the community! You're all awesome, the pros in the know, and the amateurs just looking to expand their knowledge set!😎👍

That's a good thing. I find that things are often easier than people say they are. If this guy can make something sound easy it's probably 'cause he knows what he talkign about

If you can't explain it simply you don't understand it

That’s because he is doing it himself and doesn’t have to wade through the constant beating around the bush colleges make you do to get simple information.

That's because humans tend to make things complicated, especially when you add money with them.

Hi Big Clive!

Nice to see you here sir.

He needs a forum to have people help draft them. Mmm maybe I should support though patreon and see activity there. Does he even accept support that way?

@@MrOlivm Yes, read through the description of this video and you'll find his patreon link. Might be elsewhere found on his channel when clicking on his name and maybe somewhere like in the about section?

Can’t only your subscribers see shorts or did they change that?

ppl who compalin about youtube premium cant appreciate this content. this is priceless.

not sure when you did that, but I was studying Chemistry in the late 1970's. Bruker was our NMR. Brings back old memories - some of which were even quite good! :)

Back in 2012 I was visiting universities to pick which one to go to and which degree to pick. I ended up touring the physics department at The University of Sheffield (I ended up doing Mechanical Engineering there instead) and I remember them talking about a device to detect the nitrogen or high energy nitrogen bonds (can't remember exactly) in explosives in plane luggage using some technique similar to MRI. I'm guessing it's something similar to this.

A little Diagram/Map Trap to catch the unsuspecting. Good catch!

The main similarity between the Hahn echo Ben is doing and Ramsey experiments is just that they are both pulsed experiments. Standard Ramsey is limited by T2*, the signal is dead if the space between the pulses is beyond this, whereas Hahn's echo refocuses T2*. You can combine the two, either by reading off the Ramsey signal with an echo (pi) pulse, and/or by inserting a series of pi pulses between the Ramsey pulses to extend the resolution beyound T2*. Ben mentioned T1, but more often than not, T2 (non-refocussable dephasing) is the bigger problem.

DIY!!

Lab equipment costing thousands upon thousands of dollars come with precision, repeatability, accuracy, a maintenance plan, and a fancy case. No building filters, or hand tuning, just plop the sample in and hit the go button. But when you understand the mechanisms involved, it really is amazing the kinds of instruments that can be built in a garage that can return useful data! This channel is a great example of what is possible with just some know how and a bloke in his garage!

@@josseman somethings are unavoidable, also some things are being thrown in the dumpster, or have a simple electrical fault yet being sold 'as parts', or hand me downs, or gifted, or on clearance, etc. Hell, I have a $5000 gilderfluke ride-car controller I acquired through work on theme park animatronics and stage production technology. An expensive piece of equipment doesnt necessarily mean the person who owns it bought it new, or at all. Besides, if you're crafty, you can cover a fair bit of signal inspection with a parallel port and a high sample rate soundcard, or some basic rf/sdr bits and bobs. Sure, a 'real' o-scope, even the cheapest one being sold new, would blow it out of the water. But its technically possible to cover some low hanging bases, just dont expect miracles. Its about using what you can get your hands on. What should they be doing? Judging the waveform by touching wires to their tongue?

@@josseman how else are you supposed to measure signals accurately? You and everyone and their mother can buy a Oscilloscope, try buying an MRI... You seem like the type of person that can't believe being driven means something."Wow I can't put my head around how you came up with this idea." Or "I don't know how YT Content creators do what they do." This channel may not go into his reasoning for tinkering but human nature is curiosity.

@@zombieregime Imagine if a small fraction of the money that the US gifts to foreign countries, were used to set up a few hundred MakerSpace DYI labs across the country, with equipment to loan out like libraries. Where would we be?

Cocaine?

Gamma Wave? as in human brain waves or Gamma RAY as in ionizing radiation?

@@c2n10 Ah, yea, good catch. This was like 15 years ago .... Gamma source. Not sure they still offer the VACIS (Vehicle and Cargo Inspection Systems - port entry, trains, mobile).

@@TheBackyardChemist Ha ... no, more like dirty nuc bombs.

@@truegret7778 Man, I hope they're performing more samples tested and with better accuracy so no false negatives.

Its almost like he's designed a RADAR TR tube self-switching system!

NQR is closely related to NMR, but not the same. NQR is only for quadrupolar nuclei with a decent quadrupolar moment, like 14N and 35/37Cl. NMR without a magnet is more difficult, you basically have to use hyperpolarization

Was also wndering if a directional coupler could be used to measure the return signal ?

i have to agree - I've been working with NMR as an analytical tool for a decade went on courses and the last part about pulse sequences and the quadruple aspect is very fascinating and has given me new inspiration to consider approaches like for in the field diagnostics

This is the guy that bought an Xray tube via eBay and turned it into all kinds of DIY mastery. If he had MRI parts he'd likely build a quantum computer for shits n giggles.

"always feel a bit smarter after you release a video" - I experience the exact opposite of that ;)

I noticed that too, and was wondering if it didn't matter because the amplifier may have been producing enough voltage to overcome the reverse breakdown voltage of the diode. It would be interesting to know if this was a mistake, and if it may have interfered with his experiment results.

what you mean by pair diode ????

We told them what units to use so the Voyager golden record could be decoded correctly. They have to use the hyperfine transition of neutral atomic hydrogen, which we tell them one cycle of which corresponds to 0.7 billionths of one of our "seconds".

Nope it's definitely light magic 😬🤭.

@@WowUrFcknHxC that illicited an actual groan 🤣

Agreed

😂

It is science...

Maybe you can find a crystallographer (X-ray?) who can work some wonders for you or at least give you some input on how to process the material most effectively. Definitely make a video if you can showing. Will be a neat addition on YT for the World to see. I would like to see at least. This topic and microwave spectroscopy (even the synthetic chemistry) seem like have big gaps in demonstrations on KZfaq.

You're lucky. The most I get out of my dad is suggested improvements to my Goulasch recipe.

Carrier lifetimes at 3.6 MHz get kinda iffy for a PIN diide ... standard diodes can be used as switches too, they just require a bit more current to get a low 'ON' resistance'. In the past I've used 1N4148 diodes to switch quartz crystals in receiver and transmitter circuits using either PIN or simple 1N914/1N4148 diodes; PIN at 48 MHz 3rd overtone and simple diode at 12 MHz fundamental frequency.

It is possible, but only in solids. :)

there is even such a thing a zero or near zero field MRI. The images are surprisingly usable and comparable at least to the first generation of MRI machine image quality in the early 80s.

@@Muonium1 As I understand (and here to be honest I'm an electrical engineer and not physicist) You are talking abour near zero field MRI, that is using Earth magnetic fileds? I heard abouth something like that few years ago from a friend who works as a physical chemist and they are using it to immage small lab animals. Quadruple resonance does not need any external field so it is called zero field resonance, and as I remember it is possible only in solids since in fluids the quadruple moment averages out. Again maybe I'm wrong, I have only the basic knowledge in nuclear resonance, my field of expertise is EE. :)

@@ivanpopovic9503 yes see the video here "Portable MRI developed at Los Alamos "

I heard the Combine use an unusual one with a veeery long rise time.

with application to hydroponics and the nutrient concentrations

Yes I noticed that also, he physical has 1 more set[4x] of diodes than on the schematic[3x]. Yes I was wondering the same questions

Hah! I'm surprised it works. I'll have to go see tomorrow if it's just a strange lighting effect on video. Certainly looks wrong.

@UCeAfLSBX2qycMZDr4siuuAQ 13:03

@@AppliedScience Hey, I noticed the same thing. I wonder if the voltage the amplifier is transmitting may be above the reverse breakdown voltage of the diodes you used, making the flipped ones act as zener diodes. This may be why the setup still worked even with this mistake. I'd love to know if this was just a strange lighting effect though, or if not, if correcting it may improve your experiment results. Love your videos!

I thought so too! As it turns out, Litz is only beneficial between 50KHz and 1.5MHz, at least according to the ref that I added to the description. The "proximity effect" eventually becomes worse than the "skin effect". I didn't know this, but thought it was weird that all of the NQR researchers used solid wire for their coils. Silver plating seems like it would help. Plain old thermal noise is also a big problem, and I saw some references using chilled (liquid nitrogen) coils.

I found @warecreepers comment about "litz wire...high Q" to be interesting so I asked ChatGPT the following question and got the following agreeable result: me: explain the RF nature of Litz wire used in a coil inductor for high Q at 3.6 ghz ChatGPT: Litz wire is a type of wire that is made up of multiple strands of insulated wire that are twisted together. It is often used in the construction of high-frequency inductors and transformers, as it has a number of advantages over traditional wire constructions at radio frequencies (RF) such as 3.6 GHz. The main advantage of Litz wire is that it reduces the skin effect, which is the tendency of high-frequency currents to flow primarily on the surface of a conductor. This effect is caused by the fact that the resistance of a conductor increases as the frequency of the current increases. By using multiple strands of wire in a Litz construction, the skin effect is reduced, and the current is distributed more evenly across the entire cross-section of the wire. This leads to a reduction in the AC resistance of the wire, which in turn leads to a higher Q factor in the coil inductor. A higher Q factor means that the coil inductor is more efficient at storing energy in the magnetic field, which is important for high-frequency applications such as RF communication systems. Another advantage of Litz wire is its flexibility and ability to handle high current density. This makes it ideal for high-frequency applications, where the current density can be very high. It also allows for a more compact design, which is often a requirement in high-frequency applications. In summary, Litz wire is a type of wire that is made up of multiple strands of insulated wire that are twisted together. It is often used in the construction of high-frequency inductors and transformers because it reduces the skin effect and leads to a higher Q factor in the coil inductor at RF frequencies such as 3.6 GHz, also it has a better current density handling, flexibility and it allows for a more compact design.

They are known, and taught if you know where to go. It's not more widely used as it's limitations make it applicable for niche scenarios only

Hi Ben.,did you recognize the scam here?