As a standard light source, medium and low temperature blackbody is widely used in the field of quantitative infrared remote sensing, so it is urgent to improve its calibration accuracy. This paper studies the calibration method of medium and low temperature blackbody radiation temperature based on standard transfer detector, and designs a dual channel thermal infrared transfer standard radiometer. The radiometer adopts optical path structure with achromatic off-axis reflection, its optical mechanical system is placed in liquid nitrogen refrigeration vacuum Dewar, and an optical chopper is used to improve the systematic noise ratio. Finally, through the correction experiment of commercial blackbody radiation temperature, we found that there is a certain deviation at different temperature points, and its maximum value is 3.22k. The results prove the effectiveness of the design.
In order to establish the standard transfer chain traceable to the absolute cryogenic radiometer and improve the absolute calibration accuracy of spectral radiation for optical remote sensor, an optical radiometric calibration method based on broadband monochromator light source is proposed and the corresponding system is developed. In the system design, not only the high-efficiency monochromator lighting system, low aberration off-axis paraboloid reflection optical path, high precision mechanical adjustment device and positioning device are adopted, but also the light source water-cooling system is used to effectively improve the performance of the system. The results show that the system has the characteristics of broadband, high precision and good stability, which provides an effective and feasible technical means for realizing the standard transfer of detector with high-precision.
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