| 摘要 |
PURPOSE:To increase a measuring accuracy by measuring the color temperatures of a number of portions to be measured by a single thermometer in the manner of time-division, indicating measured values and correcting the values in the course of a measuring operation. CONSTITUTION:The outputs of two types of wavelength components included in lights radiated from a plurality of portions 91, 92 and 93 to be measured and from a reference light source 3 are converted to DC current and, after the ratio between both DC voltages is obtained by a dividing circuit 20, converted to digital signals corresponding to color temperatures by an A/D converting circuit 21. Storing circuits 31, 32 and 33 store every outputted digital value corresponding to the reference color temperature of the light beam radiated from the reference light source 3 while updating the digital value. Then, the digital values are converted to analog signals by D/A converting circuits 43-45 and measured values are indicated by indicators 71-73. Thus, the color temperatures of a number of portions to be measured can be measured in the manner of time-division, measured values can be indicated in linearized conditions and a measuring accuracy can be increased.
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