Ultraviolet Sensor
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United States of America Patent
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Issued Date -
Dec 25, 2014
app pub date -
Jun 18, 2014
filing date -
Jun 19, 2013
priority date (Note) -
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Abstract
An ultraviolet radiation sensor includes an ultraviolet pass filter. A first photodiode senses light passing through the ultraviolet pass filter and provides an indication of ultraviolet light. A second photodiode provides an indication of infrared radiation. A correction circuit corrects the indication of ultraviolet light sensed by the first photodiode using the indication of infrared to account for infrared radiation that passes through the ultraviolet pass filter. Additional photodiodes may be used to correct for leakage current in the first and second photodiodes and stray infrared radiation that may affect the output of the first and second photodiodes.
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