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lainchan archive - /diy/ - 3351



File: 1487008514643.png (27.29 KB, 300x225, mikrofon-laserowy-spectra-laser-m-podsluch-przez-szyby-i-sciany.jpg)

No.3351

https://www.youtube.com/watch?v=K-96dX8ltO8

What do you think about such mics, does anyone of you Lain ma this?

  No.3374

Never built one, but I can give a few pointers based on what I do know.

First of all you really don't want to use a visible light laser, an inferred or near infrared one is probably better since you can get pretty bright without being visibly noticeable. Though I don't know how reflective glass is to such wavelengths.

Also, if you want to actually hear anything any real distance away you'll probably need some form of optics to concentrate and likely collimate the light into your receptor.

Anyways, like I said I never built one so I can't give you any nitty gritty so sorry about that. Oh and on a related note your post reminded me about something I saw a few years back, this same principle can potentially be used to recover sound from even videos. https://www.youtube.com/watch?v=FKXOucXB4a8

  No.3380

I had goggles that had a low-pass filter filtering out anything above near-infrared. Glass tended to be reasonably reflective. There were some reflective window treatments that didn't reflect IR, but the glass underneath still seemed to do what glass does.

In short, at least for the near infrared expect to treat it like glass.

  No.3382

They're OK, but they require you to be at near-zero angle of incidence. Otherwise fairly simple.