| Definition: | physical quantity yielded by a detector in response to an optical input Note 1 to entry: The output can be electrical, e.g. current, voltage or a change in resistance, or chemical, e.g. in a photographic film or an actinometer, or mechanical, e.g. in a Golay detector. Note 2 to entry: This entry was numbered 845-05-51 in IEC 60050-845:1987.
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