J4 ›› 2009, Vol. 26 ›› Issue (5): 624-630.

• Laser Applications • Previous Articles     Next Articles

Absolute infrared flux responsivity calibration of trap detectors based on cryogenic radiometer

LU Yun-Jun1, ZHENG Xiao-Bing1, LI Jian-Jun1, ZHANG Wei1, XIE Ping1, NAN Yao2, SANG Peng2   

  1. 1 Remote Sensing Department, Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Science, Hefei 230031, China; 2 The 205 Research Institute of China Weapon Industry, xian 710065, china
  • Published:2009-09-28 Online:2009-08-27

Abstract:

At the wavelength of 1064nm, the absolute flux responsivities of two Si trap detectors were measured against the cryogenic radiometer. The calibration method and experiment equipment were discussed, as well as the analysis of the measurement data. A new quasi in-situ measurement scheme of Brewster windows transmittance was proposed and transmittance higher than 0.999 was obtained. Results show that the combined uncertainties of the resonsivity are 1.457×10-4 and 1.458×10-4, and the measurement repeatabilities of the two trap detectors were within 0.014% and 0.008%, respectively. The uncertainties and possible error sources during the process of measurement were analyzed and evaluated. At last, the temperature stability of flux responsivity of 0# trap detector was studied at the wavelength of 1064nm.

Key words: remote sensing, infrared calibration, trap detector, absolute flux responsivity, temperature stability