Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-02-14
1981-04-07
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250345, G01N 222
Patent
active
042608830
ABSTRACT:
An optical measurement system for eliminating the influences of time variations on light sources, transmission lines, photo detectors, etc. The system includes light sources which generate two pulse-shaped optical signals of different light wavelengths with a portion of the optical signals being transmitted to a measuring part in a distant place by a transmission line. In the measuring part, a change of a measured object is converted into a variation in the quantity of transmission of light, and the optical signal subjected to the variation is transmitted to a signal processing portion by a transmission line. The varied optical signal is converted into a first electric signal by a photo detector. Another portion of the optical signals from the light sources is converted into a second electric signal by another photo detector. A signal processing circuit provides a measurement output indicative of the quantity of change of the measured object as a function of at least one ratio of the first and second electric signals.
Kita Shin
Maeda Minoru
Minai Yasuo
Onoda Seiichi
Tanaka Mitsuo
Hitachi , Ltd.
Hostetter Darwin R.
Nelms David C.
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