Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-01-06
1989-06-20
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356342, G01N 1507, G01N 2149
Patent
active
048411574
ABSTRACT:
There is disclosed a turbidimeter with an optical sensor having an IRED surrounded by four radiation detecting solar cells mounted on a printed circuit board which is encapsulated by a transparent potting material in a cavity of a housing. Additionally, the printed circuit board has a temperature sensor mounted thereon which is utilized by a sensor operating circuit to control the magnitude of the diode energizing current to compensate for variations in component response due to temperature variations.
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Downing, "An Optical Instrument for Monitoring Suspended Particulate in Ocean and Laboratory", Proceedings Oceans '83 IEEE, Sep. 1, 1983.
OBS-2 brochure, Downing & Associates.
OBS--3 brochure, Downing & Associates.
OBS-4 brochure, Downing & Associates, with Drawings "85-03" and 85-01 and FIGS. A & B.
Nelms David C.
Oen William L.
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