Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-10-22
1983-03-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, G02B 514
Patent
active
043784968
ABSTRACT:
The invention relates to a device for measuring current which traverses a light-emitting structure, the current passage thus causing emission of light. It is characterized in that the emitted light signal is adapted to be supplied to two photo-detectors having different sensitivity spectra and/or with at least one photo-detector being provided with an optical filter. The output signals of the photo-detectors are adapted to be supplied to a quotient forming member and/or a calculating member for obtaining a signal which is compensated for temperature variations in the light-emitting structure and other sources of error.
REFERENCES:
patent: 3244894 (1966-04-01), Steele et al.
patent: 3327124 (1967-06-01), Plum
patent: 4041308 (1977-08-01), Fujita
"Dual-Wavelength Demultiplexing InGaAsP Photodiode," Campbell et al., Appl. Phys. Lett. 34(6), Mar. 15, 1979.
Brogardh Torgny
Engstrom Olof
Ovren Christer
Sander Lars
ASEA Aktiebolag
Hostetter Darwin R.
Nelms David C.
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