Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1989-08-04
1990-05-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250577, 356436, G01N 1506
Patent
active
049298291
ABSTRACT:
In the method for detecting the point of immersion or emergence of a solid or porous body into or out of a liquid, surface waves are generated in the liquid and the light coming from a light source and reflected on the surface of the liquid is scanned photoelectrically. Only the alternating light component of the reflected light is detected here and the rectified alternating light signal is compared with a preset threshold value. When the actual value falls below or exceeds the threshold value, a control signal is then generated which can be utilized for control or regulating actions. For detecting the alternating light component, the photoelectric scanning signal is differentiated. Advantageously, scanning of the surface of the liquid is carried out at a plurality of points. The resulting rectified alternating light components can subsequently be added up, and the total value can be compared with the preset threshold value.
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Dedden Hubert
Gieger Eckhard
Lauer Christian
Allen Stephone B.
Bayer Aktiengesellschaft
Nelms David C.
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