Measuring and testing – Liquid level or depth gauge – Float
Patent
1997-04-30
1999-04-06
Williams, Hezron
Measuring and testing
Liquid level or depth gauge
Float
73 315, 2503381, G01N 700, H01J 502
Patent
active
058921400
ABSTRACT:
A micromachined integrated opto-thermal sensor having a rapidly intensity varying or pulsing light source, an interference filter, shadow masking or reflective blocking of light from thermal sensors, or differential operation, a gas cavity into which the detected gas can flow into via a channel or filter, and a thermal detector elements to sense the heating of the gas caused by the absorption of light at a particular wavelength by the specific gas to be detected. Another version of the sensor is one with a dual cavity. One cavity contains the gas to be detected and the other cavity is sealed from the ambient environment and contains no gas. Signals from the detectors from the cavities are subtracted from each other resulting in the elimination of a fixed signal due to radiation impinging the detectors.
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Patent Abstracts of Japan, vol. 097, No. 008, 29 Aug. 1997 & JP 09 089773A (Horiba Ltd), 4 Apr. 1997, See Abstract.
Honeywell Inc.
Politzer Jay L.
Shudy Jr. John G.
Williams Hezron
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