Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-03-15
1989-11-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250226, 250227, 250231P, G02F 101
Patent
active
048839523
ABSTRACT:
An optical sensor comprises a polychromatic light source (3), a detector (4), and first and second polarizers (7) (8) disposed in the light path between the source and the detector. The polarization axis of the first polarizer (7) is substantially orthogonal to that of the second (8), and there is a modulating element (6) of birefringent material disposed therebetween. The modulating element is disposed such that a change in the parameter to be measured alters the optical path length of the polychromatic light through the modulating element, thereby changing the color of the light incident on the detector (4). The detector comprises first and second photo-responsive elements (9) (10), the responsivity with respect to wavelength of the first element (9) being different from that of the second (10). Signals from the photo-responsive elements are fed to a microprocessor (13) which calculates the color of the light incident on the detector as represented by two or more parameters on the Chromaticity (CIE) Diagram, and interprets this color in terms of the parameter to be measured.
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Allen Stephone B.
Hale John S.
Nelms David C.
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