Abstract
It is known that the temperature read by two-color pyrometer, generally, do notstrictly indicate thetrue one. Therefore, it is necessary for measuring the temperature precisely by two-color pyrometer toprovide some adequate procedures. In order to obtain some informations for this compensation, themelting points of several compositions of both Fe-Ni and Fe-Cu alloys were measured by use of twocolorpyrometer, and the characteristics, especially the spectral emissivity ratio for two different wavelengthsε1/ε2 of two-color pyrometer were discussed through this experimental result.
The main results obtained were summarized as follows:
1) In liquid Fe-Ni alloy the value of ε1/ε2 decreased with increasing nickel concentration over allrange of composition, while in liquid Fe-Cu alloy the ratio also decreased gradually up to about 60%Cu but abruptly above this composition with increasing copper concentration. These data seem to beuseful as the practical coefficients converting from two-color temperature to true one for the bothalloy systems.
2) In order to accurately measure the temperature of any kind of metals and alloys by two-colorpyrometer, the relation between two-color and true temperature is desired to be derived by WIEN'Sequation through the measurement of their melting points, and moreover, the exact compensation forobtaining true temperature should be made using the values ofε1/ε2. obtained for each metal andalloy.
