Pressure sensor
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United States of America Patent
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May 27, 2003
Grant Date -
Aug 9, 2001
app pub date -
Dec 5, 2000
filing date -
May 28, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor for detecting localized pressure bearing on the sensor, comprises a volume of compressible, light translucent material having light-scattering centers evenly dispersed throughout the material. A light emitter communicates with the material to form a virtual optical cavity within the material; the intensity of scattered light is detected by a detector. A second detector is positioned at some distance removed from the first detector, outside the virtual optical cavity. Pressure bearing on the material increases the intensity of scattered light within the optical cavity. The decreased intensity is measured by the second detector. A signal processor receives signals from the first and second detectors, and resolves these signals into information indicative of pressure bearing on the sensor.
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