Apparatus for determining the flow of matter passing through a boundary surface
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United States of America Patent
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Dec 27, 1994
Grant Date -
N/A
app pub date -
May 6, 1992
filing date -
May 10, 1991
priority date (Note) -
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Abstract
An apparatus for determining the flow of matter passing through a boundary surface, which is provided with at least one sensing layer corresponding to the boundary surface, and presents a known or predetermined, finite resistance to the material flow, and wherein an optical indicator is provided in the sensing layer for obtaining a first measured value of a quantity dependent on the mean concentration of matter in the sensing layer, and wherein a second measured value of this quantity is known on one side of the sensing layer, or can be determined by means of another optical indicator provided in a second sensing layer, and, further, wherein an evaluation unit is provided for inferring the material flow from the difference of the two values measured.
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