Apparatus and method for detecting the presence of a substance o

Details Apparatus and method for detecting the presence of a substance o Apparatus and method for detecting the presence of a substance o

1979-03-09

1980-09-09

Goldberg, Gerald

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73362SC, G01N 2518, G01N 3318

Patent

active

042211255

ABSTRACT:
An apparatus for detecting the presence of a substance on a liquid surface utilizes a single semiconductor sensing element having a thermal resistance which is related to the thermal conductivity of the environment surrounding it. A control logic sequentially and periodically samples and stores ambient temperatures of the environment surrounding the sensing element, subsequently heats the sensing element, samples and stores peak temperatures of the sensing element resulting from the heating, and finally differentiates between the ambient temperatures and peak temperatures to detect any change in the difference therebetween.

REFERENCES:
patent: 3576472 (1971-04-01), Marshall
patent: 3712116 (1973-01-01), Andre
patent: 4047435 (1977-09-01), Keith
patent: 4116045 (1978-09-01), Potter

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