| 摘要 |
PURPOSE:To enable accurate measurement without being under the effect of environmental temp. at the time of measurement, by reading a correction level corresponding to a change in environmental temp. preliminarily stored in a memory part and correcting the signal level of a measuring object on the basis of said correction level. CONSTITUTION:A black body signal level detection circuit 12 extracting both signals of a first black body 9 and a second black body 10 to detect the level difference between both signals, a memory part 13 and a correction circuit 14 are provided. The correction signal corresponding to the detection signal level difference between the black bodies 9, 10 generated by the change of environmental temp. is preliminarily stored in the memory part 13. Scanning is repeatedly performed in series in the order of the black body 9, the black body 10 and a measuring object 1 and the detection level difference between the black body 9 and the black body 10 is detected at every repeated cycle to be stored in the memory part 13 and the correction signal corresponding to the detection level difference stored in the memory part 13 is read to be outputted to the circuit 14. The signal level of the object 1 is corrected on the basis of the correction signal in the circuit 14 to correct the measuring error of the object 1 generated by environmental temp.
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