Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-05-17
1987-08-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250577, H01J 516
Patent
active
046894845
ABSTRACT:
A photoelectric leak detector system for double-walled tanks and the like including a pair of optical fibers extending substantially from the top to the bottom of the annulus of the double-walled tank, a glass plate in contact with the lower ends of the optical fibers and spaced from the bottom of the annulus, a light source juxtaposed to the upper end of one of the optical fibers to pass light therethrough, and a photodiode juxtaposed to the upper end of the other optical fiber to detect changes in the reflected light issuing therefrom.
REFERENCES:
patent: 3995168 (1976-11-01), Neuscheler et al.
patent: 4069838 (1978-01-01), Hansel et al.
patent: 4118634 (1978-10-01), Carvalko et al.
patent: 4155013 (1979-05-01), Spiteri
patent: 4156149 (1979-05-01), Vaccari
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