Introduction to Radiometry and Photometry, Second Edition by Ross McCluney

Author:Ross McCluney [McCluney, Ross]
Language: eng
Format: azw3
ISBN: 9781608078332
Publisher: Artech House Publishers
Published: 2014-10-31T16:00:00+00:00

Here h is Planck’s constant, c is the speed of the electromagnetic radiation in a vacuum, and q is the charge of the electron. Two versions of this definition are noted: external quantum efficiency refers to the case where the detector input is an incident photon and internal refers to the case where the input is an absorbed photon. Substituting values for h, c, and q in (7.20) yields

if λ is in µm and R(λ) is flux responsivity in amperes per watt.

7.6.3 Noise Equivalent Power, NEP

The second most important figure of merit for a detector is a measure of the noise level it produces in the absence of incident flux. This so-called noise equivalent power is defined as the equivalent flux incident on the detector that would produce an output signal equal to the rms noise (only) output σ for operation at a stated frequency and over some stated bandwidth ∆f. Putting it another way, it is the incident signal flux level that would produce an SNR of 1.0 when signal oscillations at frequency f are compared with noise oscillations at that same frequency. NEP is therefore given by

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