| Definition: | solid angle as "seen" by the detector (acceptance angle), e.g. of a radiometer or spectroradiometer, out of which the detector receives radiation Note 1 to entry: The field of view should not be confused with the angular subtense of the apparent source, α. Note 2 to entry: A plane angle is sometimes used to describe a circular symmetric solid angle field of view. Note 3 to entry: The field of view is expressed in steradian (sr).
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