| 摘要 |
PURPOSE:To realize a stable infrared radiation meter without use of mechanical part such as chopper, by monitoring a temperature of an optical system to compensate for a temperature drift at the zero point. CONSTITUTION:A detector 1 comprising a photodiode such as InSb and HgCdTe is placed into a vacuum container 2 and cooled by a liquid nitrogen 3. Infrared rays from a measuring point form an image on a light detecting surface of the detector 1. A field of view of the detector 1 is restricted by a cold shield 4. Temperature of an optical system is monitored by a temperature sensor 8 to compensate for a temperature drift at the zero point of an infrared radiation meter by an output thereof. |
