Apparatus and method for detecting the presence of a...

Details Apparatus and method for detecting the presence of a... Apparatus and method for detecting the presence of a...

G - Physics

01

N

340/143

G01N 25/18 (2006.01) G01N 33/18 (2006.01)

Patent

CA 1106027

M-6540 APPARATUS AND METHOD FOR DETECTING THE PRESENCE OF A SUBSTANCE ON A LIQUID SURFACE ABSTRACT OF THE DISCLOSURE 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 periodi- cally samples and stores ambient temperatures of the environment surround- ing 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 there- between.

345501

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