A Measuring Technique of Spectral Sensitivity of Detectors by Two Tandem Monochromators (Report 2)

Studies on the Results of the Measurement

Abstract

The measured result of the relative spectral sensitivity of some detectors by two tandem monochromators method are described with the discussions of the error in the measurement. The Contents of the present paper are summarized as follows:
(1) The polarization characteristics of the standard lamp are experimentally assured nearly unpolarized in the spectral range of 260-800 nm.
(2) The error caused by the finite slit width are calculated for the measured relative spectral sensitivity of some detectors. The error with the spectral sensitivity of the type S-11 is estimated more than 1.0% in the wavelength region longer than 600 nm and that of the type S-20 less than 0.3% in the almost whole wavelength region involved.
(3) The measured relative spectral sensitivity of a detector by the present method are compared with that by the thermopile method. The deviation between them are found less than 2.2% in the visible range and 5.4 % in the wavelength region longer than 750 nm.