| 摘要 |
PURPOSE:To obtain a reference temperature signal stably by arranging reference temperature signals in a video signal obtained from an infrared detector in increasing order of temperature, and providing a peak holding circuit. CONSTITUTION:A scanning mirror 3 is driven by a scanning motor 2 to scans on an object 11 of measurement, but infrared-ray power from reference heat sources 17 and 19 is guided to the infrared detector 11 through a chopper mirror 6 except during the effective period of the scanning in addition to infrared-ray power from a reference heat source 10. The reference heat sources 10, 17, and 19 are, however, those for low temperature, intermediate temperature, and high temperature in order. Then, the output of the infrared detector 11 is amplified by a preamplifier 12, whose output is led to the peak holding circuit 15. |
