Moisture sensor, moisture detector, and image forming apparatus
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United States of America Patent
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Jun 10, 2014
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app pub date -
Sep 6, 2012
filing date -
Sep 7, 2011
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Abstract
A moisture sensor for detecting moisture content of an object includes a light source to emit light having an infrared wavelength that is absorbed by water; an optical system to receive the light from the light source and output linearly polarized light having a first polarization direction in a direction toward the object, and to receive light scattered from the object and output linearly polarized light having a second polarization direction perpendicular to the first polarization direction in another direction other than the direction toward the object; and a photodetector to receive the linearly polarized light having the second polarization direction output from the optical system.
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