Faraday effect

Рет қаралды 63,313

11 жыл бұрын

Effetto Faraday
E' un effetto magneto-ottico che mostra l'interazione della luce con un campo magnetico. Produce una rotazione del piano di polarizzazione della luce.
Un elettromagnete è dotato di un analizzatore (a sinistra), l'altro di un polarizzatore (a destra). Due espansioni polari perforate sono avvitate sugli elettromagneti.
Un blocchetto di vetro denso è inserito fra le espansioni polari dell'elettromagnete.
La luce di un becco a gas e polarizzata e attraversa il blocchetto di vetro e l'analizzatore. Questo viene ruotato sino ad essere perpendicolare al polarizzatore: si ha l'estinzione del raggio luminoso.
Quando la corrente è inserita il campo magnetico ruota il piano di polarizzazione della luce e non vi è più estinzione del raggio luminoso. La rotazione è proporzionale alla componete del campo nella direzione di propagazione della luce.

Пікірлер: 38

@kentvandervelden 7 жыл бұрын

Vintage lab equipment is the most exciting to see. Bravo

@LilyMyLolita 7 жыл бұрын

This effect gave Maxwell a hint that light is also an "electromagnetic wave", which was a term he invented and is common sense today.

@florencefst 11 жыл бұрын

Thank you! We have decided to produce short videos and further explanations will make it too long and heavy. We only illustrate the manipulations and the phenomena of classical 19th century experiments, which are described in many treatises of the time. We also decided to limit the descriptions and to avoid comments. The videos remains “open” so that teachers, professors, museum curators, etc. can use them with their own comments and observations following their particular needs.

@matheuspereira5153 3 жыл бұрын

Hello there. Do you have any references where i can read about it?

@abdelalinaitbrahim62 Жыл бұрын

omg long live ty

@joaopaulocoelho5401 11 жыл бұрын

This video should be extended by explaining the operation of each aparatus part. For example how the burner light is polarized, why the use of the glass piece in between the coils, what's the magnetic field strenght and is this magnetic field static. Nevertheless I loved the video.

@Hopeless_and_Forlorn Жыл бұрын

Now that is what I call a by-god rheostat! In more modern times, I have seen a practical use of this effect on aircraft weather radar: with a parabolic dish antenna used to send and receive pulses of radar energy, a blocking grid could added to one part of the face of the parabolic dish. With the radio waves having a horizontal polarization in normal mode, a narrow beam was produced to seek out detail in rain clouds. By flipping a switch, the pilot could energize a coil in the waveguide that rotated the polarization to horizontal. The radio beam would then reflect off of the grid, radically changing the shape and angle of the beam coming off of the dish to efficiently "map" ground targets below the airplane. As far as I know, this feature was lost when parabolic dish antennas began to be replaced with more efficient flat-plate types. Of course, antennae for military uses have all sorts of fancy beam-steering capabilities.

@The__Outlaw 6 жыл бұрын

I wish my little brain could understand what I just saw. )o:

@jeanfrederik5969 4 жыл бұрын

I absolutely loved this video!

@thehouseofautomata 11 жыл бұрын

An illuminating demonstration, fantastic to see.

@softsquishyfoam 11 жыл бұрын

I cryed. Beautiful

@chahituppal262 4 жыл бұрын

everything just went above my head

@FreemanBG 11 жыл бұрын

Thank you. This helped a lot :)

@espenaskeladd8934 9 жыл бұрын

One of the most important physical experiment to perform for young students. Light not only have mass as photons, but also an electromagnetic polarisation as a wave. So - let's combine them in the double slit experiment in 3D.

@ahmadkasa6510 11 жыл бұрын

Perfect.

@mustafaawadelseed1962 7 жыл бұрын

amazing

@TheWorldBelow360 Жыл бұрын

Are we sure there aren’t analyzed beams already there waiting to be organized, stretching out all over the Universe, yearning to once again be recognized, as something more than wavy grains of light?

@ingus6629 8 жыл бұрын

I have no clue what happened.

@hypnocoder 8 жыл бұрын

+MCIngus Read this 0:11 the same effect works in any LCD screen

@ingus6629 8 жыл бұрын

+hypnocoder Thanks

@sterlingtodd1669 6 жыл бұрын

Excellent! Was that a reproduction piece?

@florencefst 6 жыл бұрын

No...original 19th century apparatus

@rogeronslow1498 Жыл бұрын

Are the magnetic fields adding or subtracting in the airgap (where the glass is)?

@user-scienceislove 9 ай бұрын

YES

@HitAndMissLab 9 жыл бұрын

Impressive, didn't know that this effect existed. So a very strong magnetic field in the light's direction of propagation can "twist" the light? Magnetic field has no effect on glass, because glass is dielectric. Or doesn't it?

@blueberry1c2 8 жыл бұрын

+HitAndMissLab its the light itself. the glass just detects the rotation, or so ive read

@serendipitousbliss6548 5 жыл бұрын

What's even more interesting is the Inverse Faraday Effect. Instead of using magnetic field to polarized light ... You use circular polarized light to create a magnetic field running through the center of the circular polarized light. Essentially the same way a solenoid works. The direction of the field is dependant on the left or right handedness of the light poliarization. So essentially a polarized light beam creates it's own a magnetic field in the direction of propogation. This indeed can been seen in nature in the scarab beetle. It has a bizarre irradecent shell which is caused by tiny helical pits in the shell which allows circular polarized light in but reflects back all other light. These tiny pits allows only the light which matches into tiny helical orbits which then create tiny magnetic fields in the beetles shell which it uses for navigation ... Like a compass. It's why the Egyptians used the scarab as a myth to explain how the sun moves through the sky. It's also how our solar system works -A giant solenoid with the sun at the center. Where do you think all that energy comes from ;)

@tomb816 Жыл бұрын

So, you can turn the light on and off w/ electricity!

@ratnajoybhowmick7889 6 жыл бұрын

Sir, will you please suggest what things are happening here?????......To me the experiment appears to be a short story in literature.....a complete one, but still incomplete....

@fondazionescienzaetecnicaf5410 6 жыл бұрын

Faraday discovered that light is influenced by a strong magnetic field . The experiment simply show how a polarized beam of light changes the plane of polarisation when it goes trough a prism of glass in a strong magnetic field. Suggestions: en.wikipedia.org/wiki/Faraday_effect Thank you for following us!

@ikeben400 6 жыл бұрын

"The problem with Physics is that the people who KNOW Physics don't know how to Explain Physics..."

@BoWeava 5 жыл бұрын

kzfaq.info/get/bejne/js6FYNF_zqfLpH0.html. This is a different take on the same experiment. Looks kinda like this device turned inside out, where the polarized sheets take the place of the dense glass and the viewfinder, and there's only one coil 🤔

@apotter8888 4 жыл бұрын

It was beautifully done, but I have no idea what you did or why it is important.

@A____G Жыл бұрын

@@roxannemackinnon2213 Thank you, I needed this explained at a kindergarten level lol

@danielpartida2424 5 жыл бұрын

this video did not help at all to undersatnd the faraday effect, needs an audio explanation

@florencefst 5 жыл бұрын

Dear Dani, We are sorry that you did not find our video clear enough. Generally it is considered well done and understandable. Sincerely yours P.Brenni A.Giatti

@whocanseemyname-2450 3 жыл бұрын

@@florencefst literally everyone says they don't understand it, though...