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Old 06-03-2008, 05:05 PM #1
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Default laser listening device?

If you used a laser, and reflect a beam off of a window pane, you should be able to pick up sound from the beam, and if you did it right, you could use interference to create an extremely sensitive listening device! I would think the higher the frequency of the laser the more sensitive this could be made. This would be a cool project to try with a bluray diode.


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Old 06-03-2008, 06:30 PM #2
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Default Re: laser listening device?

Unfortunately the actual site seems down, but there was an article on Hack-a-Day about it; I can't post the link, but it is on hackaday.com, posted march 22nd, 2006.

There is a discussion there in the comments, and the williamson-labs link has good information still.
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Old 06-03-2008, 09:53 PM #3
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Default Re: laser listening device?

This has been done before.All you need is a laser, a photodiode and a microfone jack.Of course this would turn out very choppy , but you can improve on it. :P
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Old 06-04-2008, 01:03 AM #4
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Default Re: laser listening device?

Quote:
Originally Posted by Switch
This has been done before.All you need is a laser, a photodiode and a microfone jack.Of course this would turn out very choppy , but you can improve on it. :P
it's very, VERY annoying.

i wonder if you could add like a vocoder and turn the sound into music or a sample

(farts into music, anyone?)
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Old 06-04-2008, 03:47 PM #5
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Default Re: laser listening device?

[link=http://www.hackaday.com/2006/03/22/laser-listening-device/]http://www.hackaday.com/2006/03/22/laser-listening-device/[/link]

here's the original post from hackaday
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Old 06-04-2008, 08:37 PM #6
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Default Re: laser listening device?

cool, thanks, I will have to try this out. 8-)

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Old 06-05-2008, 02:38 AM #7
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Default Re: laser listening device?

that's the post I was talking about; thanks for posting it (I need 10 posts before I can submit links)
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Old 10-17-2011, 04:26 AM #8
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Default Re: laser listening device?

wow that is very cool.......i hope i can ty this one
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Old 10-17-2011, 04:33 AM #9
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Default Re: laser listening device?

if you guys eve watched eagle eye movie....maybe it kindof like that rite?
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Old 10-17-2011, 04:59 AM #10
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Default Re: laser listening device?

Why did you resurrect a 3-year-old thread just to type some inane "wow that is very cool" message?

These old threads should auto-lock after a year.
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Old 10-17-2011, 05:00 AM #11
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Default Re: laser listening device?

Two things;

1. Don't necropost. The last reply on this thread prior to you was in 2008... it's been over three years.

2. Learn to use the EDIT button instead of posting twice.
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Old 10-17-2011, 11:56 AM #12
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Default Re: laser listening device?

Quote:
Originally Posted by Bionic-Badger View Post
Why did you resurrect a 3-year-old thread just to type some inane "wow that is very cool" message?

These old threads should auto-lock after a year.
I agree....
That would stop a lot of NecroPosting by new members...


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Old 10-17-2011, 12:45 PM #13
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Default Re: laser listening device?

Since this has been necroposted I'll post some actual relavent info!

A tv show called "Penn and Teller tell a lie" recently did a segment about this exact scenario and claim that it works. They used about $20 worth of parts to do it.

Note. Yes in the vid you see Teller (guy on the right) shine a green laser into his eye...... yeah no comment. Hope it was <5mw?

Penn & Teller Tell A Lie - Laser Pointer Listener? - YouTube
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Old 10-17-2011, 03:33 PM #14
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Default Re: laser listening device?

I've seen that too, but already knew it works from other websites etc describing the system.

Downside is that it works only when you are looking straight onto the window, or you would need different locations for the laser and the receiver.
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