Film radiometer based on electrical substitution for use in photometric measurements

The design of a nonselective radiometer that functions on the basis of the principle of electrical substitution is described. The assembled radiometer possesses high current-voltage sensitivity on the order of 10 V/W, time constant 7 sec, and error in measurement of the emissive power at most 0.3%. It is designed for exact photometric measurements in the visible and infrared bands of the spectrum. Translated from Izmeritel'naya Tekhnika, No. 5, pp. 18–21, May, 1997.