Optical humidity sensor

Details Optical humidity sensor Optical humidity sensor

1985-08-15

1987-02-10

Levy, Stewart J.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

733365, G01W 100

Patent

active

046415246

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.

REFERENCES:
patent: 3192426 (1965-06-01), Feuer
patent: 3528278 (1970-09-01), Sterling
patent: 3926052 (1975-12-01), Bechtel
patent: 3972619 (1976-08-01), Stevens
patent: 4083249 (1978-04-01), Gerber
patent: 4539521 (1985-09-01), Matsumoto

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