Abstract

The direct optical digital detection of analog mechanical motion of a diaphragm is described both experimentally and theoretically. The conversion is made by a Michelson interferometer which detects deformation of the diaphragm caused by acoustic pressure. Theoretical calculation shows that the maximum resolution is strongly dependent on the detector width, it becomes 9 bits when a single-mode optical fiber is used as the detector. An 8-bit A–D conversion is experimentally obtained using a Michelson interferometer constructed with a He–Ne laser, a 2.54-cm (1-in.) diam diaphragm, and a detector of 50-μm diam multimode optical fibers.

© 1986 Optical Society of America

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