Experimental difficulties encountered in the determination of spectral sensitivity functions (Sλ) of photoelectric detectors make it desirable to have independent checks on a measured Sλ. A multifilter method is described which allows not only a check on a given Sλ, but also makes it possible to determine Sλ directly and independently of any previous measurements. The filters employed in the method have to satisfy the condition that their spectral transmittance functions form a set of linearly independent functions over the spectral range considered. The practical importance of the method and ways of checking its precision are discussed, using a numerical example which involves 14 linearly independent filters forming a 14×14 matrix of spectral transmittances for the spectral range 390 to 670 mμ.
© 1960 Optical Society of America
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