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Reconstructing temperature field images by MWIR and LWIR based on uncooled IRFPA

With the development of high-performance IRFPA, temperature field image measurement has been applied to the fields of industry and agriculture, national defence, health and epidemic prevention. In order to obtain a clearer and more accurate image of temperature field, we developed a coaxial beam splitting medium wave/long wave dual-band infrared temperature field image reconstruction experimental system using uncooled wide-band IRFPA. Then, a low frequency noise correction method in gradient domain is used to reduce the temperature measurement error caused by the non-uniformity of detectors. The temperature measurement error of central field of view is less than 3.5% and that of quadrangular field of view is less than 4.5% in the temperature range of 20~80°C by calibrating the temperature of the system using blackbody. Experimental results show that the method is effective. Finally, the equivalent temperature field image to the typical outfield image is given.