Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-10-15
1994-08-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022723, 356440, G01N 1506
Patent
active
053348508
ABSTRACT:
An interface between a first fluid and a second fluid to be detected passes through a light transmitting unit. A light source unit supplies light to the light transmitting unit through an optical fiber. A light detecting unit detects an intensity of the light from the light source unit through the light transmitting unit. A deflection of an output of the intensity of the light detecting unit is monitored to detect the passage of the interface of the first and the second fluids. In the device according to this invention, based on a difference in light transmission characteristics between the first and the second fluids, a spectral intensity of the light source unit, characteristics of an optical path from the light source unit to the light detecting unit, and spectral detection sensitivity characteristics of the light detecting unit are suitably selected, so that a difference in an output of the detecting unit detectably exceeds a set value when the interface of the two fluids passes through the light transmitting unit. Consequently the passage of the interface between the two fluids can be detected with high precision.
REFERENCES:
patent: 4045668 (1977-08-01), Pitt et al.
patent: 4544840 (1985-10-01), Keller
patent: 4637729 (1987-01-01), Schoch
patent: 5164608 (1992-11-01), Vali et al.
patent: 5208465 (1993-05-01), Jacobson
Allen S. B.
Nelms David C.
Sumitomo Chemical Co,. Ltd.
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