Design of Double Black Body Collimating Light Tube Radiation Source for Calibrating Infrared Thermal Imager
In order to calibrate the imaging characteristic parameters of the infrared thermal imager,a double black body collimating optical tube radiation source is designed.The reflection optical system is used to solve the problem that the transmission optical system is difficult to eliminate the color difference.Its working spectrum can cover a wide spectral range of 0.38～12 μm.The target assembly adopts the form of reflecting target.Through the interaction between the target self-calibrated blackbody radiation source and the background self-calibrated blackbody radiation source,the thermal characteristics of the target are simulated,and the temperature rise of differential targets can be eliminated.The radiation source has been tested by the national legal metrological technical institution and meets the design requirements.The radiation source is used to calibrate and verify the imaging characteristic parameters of a type of infrared thermal imager.The results show that it can be used for automatic testing of SITF,NETD and MRTD parameters of infrared thermal imagers with blackbody temperature range of 5 ℃ to 100 ℃ and differential temperature range of-15 ℃ to 45 ℃.The uncertainty of temperature difference is 0.02 ℃.
opto-electronic measurementdouble black body radiation sourceinfrared thermal imagerimaging characteristiccalibration
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