A scientist here yesterday was talking to me about his technology white whale he’s been chasing for like three decades now. He used to do be research in Tucson Arizona, and there was an older guy working there who built a kind of really cool optical microphone.
He apparently used a like rangefinder/ focusing thing from an old SLR camera. And put like a lens in front of it into a little tube and then just had an analog amps and output to a sound thing. The scientists kept wanting the older guy to build another one for him or teach him how to build it but the older guy was a little stubborn I guess and then he died unfortunately.
The guy who made the things was named dr Hayward spangler Interview with Dr. Hayward Spangler on ant sounds, Acoustic Atlas Recording - Montana State University (MSU) Library
(The guy has done a lot of cool research projects, and also kind of sounds like Kermit the frog).
Does anyone here have any experience with this kind of design of an optical microphone? Or a different way of producing a really low cost optical microphone that can sense surface vibrations?
Basically the scientists here usually have to use a laser microphone for this kind of thing which cost like 20k.