View single post by EVPDave
 Posted: Apr 17th, 2011 07:20 AM
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EVPDave

 

Joined: Mar 7th, 2007
Location: USA
Posts: 206
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  Good to see someone finally experimenting in this area.  I wrote that article as a follow-up article to one about the optical flame microphone.

 I have two recorders I modified by removing the internal microphones, completely replacing the element with a photodiode. Under certain lighting conditions some photodiodes can become quite microphonic, an interesting internal effect.

 Of the various devices I tested such as phototube, photomultiplier tube and photodiode, a simple solar cell arrangement proves most sensitive. Here is a liink to a demo video I made a few years back demonstrating the optical flame microphone.

 http://www.youtube.com/watch?v=j5-WOuWPHOY

Looking forward to reading of your future experiments.

Dave


P.S. Link to the very first optical microphone article I wrote from 2006, using the very sensitive OPT101 .  http://atransc.org/techniques/techniques_optical_microphone.htm