Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-30
1993-10-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73705, G01D 534
Patent
active
052528260
ABSTRACT:
A differential pressure sensor utilizing an opto-reflective sensor comprising a diaphragm with a top and a bottom, the diaphragm having an optical reflector mounted upon it. The diaphragm is mounted in a housing, wherein the housing has a first inlet port and a second inlet port, the first inlet port providing a first pressure to the top of the diaphragm and the second inlet port providing a second pressure to the bottom of the diaphragm. An opto-reflective sensor is mounted in the housing, wherein the opto-reflective sensor provides an optical signal to the optical reflector. The optical reflector reflects the signal back to the opto-reflective sensor, wherein the differential pressure sensor calculates the distance of the optical reflector from the opto-reflective sensor in relation to the relative intensity of the reflected optical signal. The differential pressure sensor then calculates the differential pressure between the first pressure and the second pressure based on the relative intensity of the reflected optical signal.
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Honeywell Brochure, "C6065A Differential Pressure Switch", Publication date unknown.
OMRON Brochure, "Photomicrosensors", Publication date unknown.
Honeywell Inc.
MacKinnon Ian D.
Nelms David C.
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