normalized detectivity (of a detector) [D*]

detectivity, D, normalized to take into account 2 important parameters of the detection system, the sensitivity area, A, of the detector and the measurement bandwidth, Δf      


where Φm is the noise equivalent power

Unit: m·Hz1/2·W-1

NOTE This concept is realistic only if the responsivity and noise output of the detector are frequency independent throughout the frequency range under consideration and if the noise equivalent input varies as the square root of the detector area; this is not always the case.

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