Application of image processing technology in temperature measurement of laser pool

In order to improve the performance of cladding layer, image processing technology was used to detect the temperature field of laser molten pool. A color CCD industrial camera was used to collect the image data and median filtering method was used to remove the image noise. After processing, the image data were calibrated by high-precision HG-2 standard high temperature blackbody furnace, and temperature fitting formula was obtained. The original images were transformed into pseudo color images by image processing, which reflected temperature distribution and change rule in each area of the molten pool. The results show that the maximum error between the temperature calculated by the fitting formula and the actual temperature is 1.23%. The detection precision meets the demand of the field application, and temperature detection of molten pool is realized.