Size-of-source Effect and Self-radiation Effect of an Infrared Radiation Thermometer

적외선 복사온도계의 복사원 크기효과 및 자기복사효과

  • 유용심 (한국표준과학연구원 기반표준본부) ;
  • 김봉학 (한국표준과학연구원 기반표준본부) ;
  • 박철웅 (한국표준과학연구원 기반표준본부) ;
  • 박승남 (한국표준과학연구원 기반표준본부)
  • Received : 2010.04.27
  • Accepted : 2010.06.23
  • Published : 2010.08.25


All radiation thermometers have a size-of-source effect (SSE) and a self-radiation effect (SRE). The SSE,defined as dependence of the detector signal of a radiation thermometer on the diameter of a source, is critically dependent on the wavelength since diffraction is the main cause. In this paper, we have measured the SSE and the SRE of TRT2 (Transfer Radiation Thermometer 2, HEITRONICS) widely used as a transfer standard in low and middle temperature range. At $300^{\circ}C$, The radiation temperature difference between the 60 mm diameter blackbody and 10 mm diameter blackbody due to the SSE was estimated to be $3.5^{\circ}C$ in low temperature mode ($8-14\;{\mu}m$) and $0.5^{\circ}C$ in middle temperature mode ($3.9\;{\mu}m$). In addition, the measured radiation temperature difference of the blackbody due to the SRE was found to be 110 mK when the body temperature change of TRT2 was set at $2.6^{\circ}C$.


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