Optical humidity sensor
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United States of America Patent
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-
Feb 10, 1987
Grant Date -
N/A
app pub date -
Aug 15, 1985
filing date -
Aug 15, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical dielectric humidity sensor which includes a dielectric mirror having multiple alternating layers of two porous water-adsorbent dielectric materials with differing indices of refraction carried by a translucent substrate. A narrow-band polarized light source is positioned to direct light energy onto the mirror, and detectors are positioned to receive light energy transmitted through and reflected by the mirror. A ratiometer indicates humidity in the atmosphere which surrounds the dielectric mirror as a function of a ratio of light energies incident on the detectors.
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