It is well-known that the spectral radiances of a temperature radiator are given by Planck's equation or approximately by Wien's equation.
In this report, the temperature coefficient of a temperature radiator is defined and derived from these equations, and the physical meaning and their numerical table are presented.
Applying this quantity to the problems dealing with relations between the spectral radiances and the temperatures of a temperature radiator, the following results are obtained
1. The effectiveness of a shorter-wavelength monochromatic light in order to obtain a greater sensitivity in the measurements of temperature differences by single monochromatic light system.
2. In a double monochromatic light system, the mathematical expressions of the out-put signals, which correspond to the temperature differences, as the functions of the temperature coefficients of' two monochromatic lights.
3. Experimental data of the temperature coefficients of a tungsten filament lamp.
4. Comparison of the above two systems.
5. Discussions on the ten' perature coefficients in the case of selective radiators and heterogeneous lights.
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