Volume 5 Issue 3
Jun.  2012
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ZHANG Xiao-long, LIU Ying, SUN Qiang. Radiometric calibration of uncooled long-wave infrared thermal imager with high-precision[J]. Chinese Optics, 2012, 5(3): 235-241. doi: 10.3788/CO.20120503.0235
Citation: ZHANG Xiao-long, LIU Ying, SUN Qiang. Radiometric calibration of uncooled long-wave infrared thermal imager with high-precision[J]. Chinese Optics, 2012, 5(3): 235-241. doi: 10.3788/CO.20120503.0235

Radiometric calibration of uncooled long-wave infrared thermal imager with high-precision

doi: 10.3788/CO.20120503.0235
  • Received Date: 21 Feb 2012
  • Rev Recd Date: 23 Apr 2012
  • Publish Date: 10 Jun 2012
  • In order to achieve the high accuracy temperature measurement for a uncooled long-wave infrared thermal imager under different ambient temperatures, the radiometric calibration model of the infrared thermal imager is established in consideration of the effect of detector operation temperature. The radiometric calibration experiment is then conducted, and sixteen functional relations between image gray levels and detector operation temperatures at different blackbody temperatures and different brightness gain values are obtained. The mathematical calculation model of target temperature is established and the calibration result is verified by experiments. The results show that the detector operation temperature effect can be treated linearly in the range from 25 ℃ to 40 ℃, and it is independent on the target temperature. By setting an appropriate brightness gain, the temperature measurement error of the infrared thermal imager is less than 0.5 ℃, which is a great improvement of the measurement accuracy of the uncooled long-wave infrared thermal imager under different ambient temperatures.

     

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