Source-detector spectral matching factors

Procedures are described for simplifying the computation of detector responsivity (output per unit input) from known detector calibration data. These procedures involve the computation, tabulation, and use of certain dimensionless spectral matching factor ratios. These ratios effectively express the relative degree of overlap occurring between the spectral response distribution of the detector and the spectral distribution of the incident flux to be detected. All three basic systems of units for expressing detector responsivity (A/W, A/Im, and electrons/photon) are considered.