| 摘要 |
PURPOSE:To indicate color temperature accurately regardless of aging by including an optical system adapted to admit beam into a potoelectric conversion element via two kinds of filters, a potentiometer, a servometer, an amplifier and the like to allow the start of temperature measuring operation after calibration. CONSTITUTION:When beam 3 or 4 radiated from an object 1 to be measured in the temperature or a standard light source 2 is made incident on a photoelectric conversion element 7 via a rotary filter 10, an electric output is generated from the photoelectric conversion element 7 corresponding to the intensity of the beam passing through the rotary filter 10 and amplified with an amplifier 13 to obtain an output of C waveform. The output is separated into two outputs A and B with the peak of (a) and (b) with a separator 14 corresponding to the intensity of a wavelength component passing through two kinds of filters 11 and 12 using an output of a 2-phase AC generator 9 and smoothed separately with smoothing circuits 15 and 16 to obtain DC voltages a' and b' proportional to the peaks (a) and (b), which are introduced to first and second potentiometers 17 and 18 and voltage dividing resistances 19 and 20. |
