Measurement method of self-thermal radiation for coaxial total reflection infrared optical system

Yu Fei; Ren Qifeng; Li Hua; Sun Wei; Huang Zhiqiang

doi:10.3788/IRLA201847.0104003

Infrared optical system self-thermal radiation was evaluated, calculated and measured. Firstly, it introduced and compared the two kinds of the thermal radiation way of evaluation, effective emissivity and equivalent blackbody radiation temperature; Secondly, the way based on experiment of calculation for equivalent blackbody radiation temperature of self-thermal radiation was introduced in detail; Finally, the coaxial reflection infrared optical system thermal radiation was measured by using self-thermal radiation test platform and error analysis was carried out. The result show that self-thermal radiant exitance is proportional to the square of effectively F number of optical system and the linear coefficient for the output gray of self-thermal radiation between the integral time, is inversely proportional to transmittance. It shows that the equivalent blackbody radiation temperature for self-thermal radiation of coaxial reflection infrared optical system is 217.3 K. Error for radiation form background simulation board is 8.5%, the relative uncertainty of linear coefficient for the output gray of self-thermal radiation between integral time is 0.2%. It shows that infrared detector has a good stability under 5×10-4 Pa.

Measurement method of self-thermal radiation for coaxial total reflection infrared optical system

1. The Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,China;

2. University of Chinese Academy of Sciences,Beijing 100049,China

Received Date: 2017-06-01

Rev Recd Date: 2017-08-15

Publish Date: 2018-01-25

Key words:

infrared system /
self-thermal radiation /
equivalent blackbody radiation temperature

Abstract: Infrared optical system self-thermal radiation was evaluated, calculated and measured. Firstly, it introduced and compared the two kinds of the thermal radiation way of evaluation, effective emissivity and equivalent blackbody radiation temperature; Secondly, the way based on experiment of calculation for equivalent blackbody radiation temperature of self-thermal radiation was introduced in detail; Finally, the coaxial reflection infrared optical system thermal radiation was measured by using self-thermal radiation test platform and error analysis was carried out. The result show that self-thermal radiant exitance is proportional to the square of effectively F number of optical system and the linear coefficient for the output gray of self-thermal radiation between the integral time, is inversely proportional to transmittance. It shows that the equivalent blackbody radiation temperature for self-thermal radiation of coaxial reflection infrared optical system is 217.3 K. Error for radiation form background simulation board is 8.5%, the relative uncertainty of linear coefficient for the output gray of self-thermal radiation between integral time is 0.2%. It shows that infrared detector has a good stability under 5×10-4 Pa.

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Reference (11)

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Measurement method of self-thermal radiation for coaxial total reflection infrared optical system

doi: 10.3788/IRLA201847.0104003

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