Method and apparatus for detecting movement of an electro-optical transducer
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United States of America Patent
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Jul 6, 1993
Issued Date -
N/A
app pub date -
Oct 3, 1991
filing date -
Oct 3, 1990
priority date (Note) -
Expired
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Abstract
An apparatus for photo-optically detecting transducer motion using a photodetector resiliently suspended inside the transducer housing and photo-optically coupled to a light source. During movement the inertia effect of the photodetector along with the resilient suspension system causes the changes in the photo-optical coupling between the photodetector and the light source. The inertia effect of the photodetector is enhanced by adding a mass to the photodetector. Either the magnitude or the phase of the photodetector output is monitored to detect movement. In another embodiment, a light emitter is resiliently suspended so that movement induced changes in the position of the light emitter alter the coupling of light to one or more light detectors.
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