The Temperature Measurement Method Based on the Image of Mechanical Part during Heating Treatment

Abstract

The mechanical part was heated to the heat treatment temperature, and the surface color changed with temperature. The infrared radiation thermometer was used to get heating part temperature, and the corresponding color images were taken by the camera at the same time. The program was designed to analyze the images and display the temperature. To decrease the effect of the noise disturbance in the process of image, the combined filter method was used. The relationship between the temperature and image of heating mechanical parts were obtained through digital regression. The analysis and comparison results show that the temperature measurement precision of three primary color is higher than gray’s from 700°C to 1100°C. The three primary colors have more information for image recognition than that of gray image, and are suitable for higher technical requirements.