Precision, Limit of Detection, and Signal-to-Noise Ratio
The equation of Jacquinot for the output power P of spectrometers is generalized to include spectrographs. By means of the concepts of responsivity and detectivity, one may then compare spectrographs equipped with photographic and photomissive sensors.
If area A is an adjustable parameter, e.g., by choice of dispersion, slit height, emulsion resolution, or exit slit width, then/it is neither P nor P/A, but rather P/A1/2 that is to be maximized for best analytical precision or limit of detection.
KeywordsQuantum Efficiency Shot Noise Photographic Plate Output Noise Noise Equivalent Power
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