FLUID CONCENTRATION MEASURING DEVICE
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Accused Products
Abstract
A fluid concentration measuring device measures the concentration of a fluid flowing through a duct having a light-transmissive, deformable duct wall. The device includes a light source; a light receiving element which receives the light, which passed through the wall of the duct and the fluid inside the duct, and outputs a signal indicating the intensity of the light; light path distance setting means and fluid concentration output means which obtains a plurality of relational expressions, which indicate the relation between the light intensity and the fluid concentration when the light from the light supply part is received by the light receiving part over each of the light path distances, and obtains the fluid concentration from the light intensity at the light receiving part based on the relational expressions for the plurality of light path distances and outputs the fluid concentration.
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Citations
12 Claims
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1-4. -4. (canceled)
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5. A fluid concentration measuring device which measures concentration of a fluid flowing through a duct having a light-transmissive, deformable duct wall, the device comprising:
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a light source which supplies light into the duct from a light supply part on a surface of the duct; a light receiving element which receives the light, which has been supplied and passed through the wall of the duct and the fluid inside the duct, at a light receiving part located on an opposite side in a diametrical direction of the duct relative to the light supply part, and outputs a signal indicating intensity of the light; light path distance setting means which sets a plurality of light path distances between the light supply part and the light receiving part; and fluid concentration output means which, from the light intensity at the light receiving part located at each of the plurality of light path distances, obtains a plurality of relational expressions, which indicate relation between the light intensity and the fluid concentration when the light from the light supply part is received by the light receiving part over each of the light path distances, based on the Beer-Lambert law, and obtains the fluid concentration from the light intensity at the light receiving part based on the relational expressions for the plurality of light path distances and outputs the fluid concentration. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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Specification