Time Harmonic Electromagnetic Wave Propagation Demo

[dailypinoyshowbiz]

I want this video on my Cubo phone.

[lifehackertips]

i dont care how it's done, i just want to see what it looks like when it's done

[scoobyroo06]

so is this a running play or passing play?

[Ducky1138]

I want a basement-laboratory... :(

[TurboLoveTrain]

neat. please use darker ink next time..

[KurosakiYasutora]

Very nice indeed!!! I only wish that the drawings on the whiteboard were a bit bolder... You mentioned something about a 2.4 GHz frequency, so what is this frequency? only the carrier? or the central frequency of a wider spectrum wave? Maybe is clearer if i ask what are the properties of the wave you are using for the radar system and how to produce in a basement lab?

[luxfx]

This could be expanded to demonstrate the wave pattern in the double slit experiment, yes?

[charvatg]

@luxfx Yes, absolutely. That would be a very interesting visualization. I will keep this in mind next time i create another demo.

[Ajahanfard]

I wanted to say your brilliant and i am glad they are people out there who are still able to pioneer simple devices to show simple ideas .

A++++

[nikolaiyk]

Nice!

[proudsnowtiger]

Should really be using (James Clerk) Maxwell House coffee cans...

[emarnold5]

Cool

[KB8VAO]

Great video! Thanks for sharing. I would be interested in an experiment moving the placement of the feed, to see if / how the pattern might be affected. Don't know if you are an amateur radio operator, but if so, I hope to work you on the microwaves. I'm on all bands from 160 Meters to 80 GHz. 73 de KB8VAO, Steve

[jasonholland]

This method is a good way to show what a 2D cross-section plane would look like. I would suggest using the Kinect sensor (for example,) to map out a 3D view of the wavefront. Cross this experiment with a Kinect hack - that would be cool.

[joeteejoetee]

The last 2 minutes were the best ever! You made it look easy, so expect copycats of your scenario on video = Earth gets smarter = WIN!!! Thank you very much!

[monarchham]

Very cool! Are we seeing an actual wave front or simply a standing wave? It seems that the demo is illistrating the positions of the peaks/valleys of the RF wave thereby a standing wave.

How about a radar building workshop at FDIM/Dayton????

73

Herb/WR9H

[charvatg]

@monarchham Although it looks similar, it is not a standing wave, it is a coherent detector. You are viewing the phase of the traveling wave wrt its reference.

[gthomas]

Great stuff. This reminds me of a project I always wanted to build, a pair of RF Binoculars.

George, W5JDX

[jeriellsworth]

Very nice. I reproduced this with sounds after seeing the old RCA photos of standing waves.

[charvatg]

@jeriellsworth That is fantastic! I just looked at your demo. This one is different in that i am using a coherent detector to detect traveling, rather than a standing wave. By coherent detector i mean that i am continuously multiplying my transmitted CW tone by what i receive and this is what drives the LEDs. Therefore the LEDs are phase coherent with the microwave source. It should be even more clean than this but i think the problem was that my arm was not at the same height all the time.

[jeriellsworth]

@charvatg Sweet!

[scottrharris]

Very nice visualization! I need to get back to the coffee can radar. The last time I was working on my copy I rebuilt the circuitry on a protoboard to make it sturdier. I just need to get outside and take some good data. Thanks!