Abstract
Regression analyses of the characteristics of 4 vacuum and 4 gas-filled tungsten strip lamps which had been manufactured in Japan as the pyrometric standards and calibrated regularly every year since 1967 in the Thermal Measurements Section of the NRLM revealed that their luminance temperature-current relations are expressed by a biquadratic regression equation having on its third and fourth power terms numerical coefficients common to all the lamps of each type. This result indicates that the relation pertinent to any lamp can be expressed by the sum of a quadratic equation specific to that lamp and a common biquadratic equation. Based on these analyses, a set of numerical tables (relating to IPTS-68) is made. This table is available in interpolating the luminance temperature (T)-current (I) data of a generally used tungsten strip lamp in Japan, or in calculating dI/dT.
