Spectral Sensitivity Determinations by Cutoff Filters

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Abstract
A series of 26 selenium glass filters with cutoffs uniformly paced over the visible spectrum is used as the basic set of filters to determine the relative spectral sensitivity function of a given photoelectric receiver. Certain characteristics of these filters, such as non-uniformity of transmittance across the filter surface and temperature dependence, impair the precision of the transmittance measurements as well as photocell response measurements. Nevertheless it is possible to derive fairly well-conditioned matrices of difference functions obtained from the basic set of cutoff filters, which will allow a satisfactory determination of a spectral sensitivity function. Experimental as well as numerical implications are discussed in detail on the basis of a practical example.

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