Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-12-12
1979-06-26
Grimm, Siegfried H.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250577, 340605, 340619, 350 9633, G01F 2300, G02B 514, G08B 2100
Patent
active
041594207
ABSTRACT:
An improved apparatus suitable for detecting the outflow of a liquid such as petroleum or the like and petrochemical products from a storage tank or pipe line thereof is disclosed. The detecting apparatus comprises a detecting element including a light transmitting path made of a transparent solid material having a refractive index larger than the refractive index of water through which the light is transmitted from a light source to a light detector. If the peripheral wall surface of the light transmitting path is wetted with a liquid to be detected which has a larger refractive index than the material forming the light transmitting path, the light being transmitted through the path leaks out of the path at the wetted area of the peripheral wall surface due to the difference of the refractive index between the liquid and the path. Therefore, the presence of the liquid to be detected contacting with the light transmitting path can be detected by detecting a change in the quantity of the light which has passed through the path.
REFERENCES:
patent: 2190027 (1940-02-01), Jordan
patent: 3448616 (1969-06-01), Wostl et al.
patent: 3564526 (1971-02-01), Butts
patent: 4045668 (1977-08-01), Pitt et al.
Freeman, "Liquid Level Indicator," IBM Technical Disclosure Bulletin, vol. 5, No. 1, Jun., 1962, p. 87.
Denki Kagaku Keiki Co., Ltd.
Grimm Siegfried H.
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