Meniscus position detector with detector at the focal plane of t

Details Meniscus position detector with detector at the focal plane of t Meniscus position detector with detector at the focal plane of t

1982-09-30

1987-03-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73293, G01H 1506

Patent

active

046545352

ABSTRACT:
A non-invasive photoelectronic device which determines the location of a liquid column within a transparent tube. The device includes a source of visible light, transmitted as a substantially parallel light beam against a transparent lensing tube which may be a sightglass or a leg of a U-tube manometer located within the light beam. The liquid contained within the tube forms an identifiable liquid column which acts as a highly effective condensing lens to the transmitted light beams with a resultant focus close to the tube. A plurality of optoelectronic detectors are arranged in an array over the portion of the tube to be monitored. Each detector is a phototransistor which is responsive to the large change in light intensity caused by the lensing effect of the liquid-filled tube compared to the non-lensing action of the adjacent portion of the tube.

REFERENCES:
patent: 3209596 (1965-10-01), Kelly
patent: 3947692 (1976-03-01), Payne
patent: 4084426 (1978-04-01), Gates
patent: 4123227 (1978-10-01), Heim et al.
patent: 4333016 (1982-06-01), Bilstad et al.

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