optical microphone
optical microphone
[¦äp·tə·kəl ′mī·krə‚fōn] (engineering acoustics)
A microphone in which the motion of a membrane is detected using a light beam reflected from it, either with the aid of an interferometer or by detecting the deflection of the beam.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.