Optical sensor for water-air detection
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United States of America Patent
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Jan 9, 2018
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app pub date -
Jan 30, 2015
filing date -
Jan 30, 2015
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Abstract
A sensor and a method of manufacture of a sensor includes a light interface portion comprising first and second walls, where a cavity is provided between the first and second walls, and where the first wall is configured such that at least a portion of light is totally reflected at the first wall when the sensor-external medium is water, and at least a portion of light is coupled out when the sensor-external medium is air, and a portion of light is coupled out and a further portion of light is totally reflected by the first wall when the sensor-external medium comprises foam. Light that is reflected by the first wall is directed toward a second wall, and reflected at the second wall to be directed to a light receiving element.
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