Fusion Temperature Detection Based On Spectral Temperature Measurement And RGB Three-color Imaging

To evaluate the effectiveness of laser irradiation on a target,non-contact detection of temperature changes in the irradiation area is an effective method.In this study,we employed a color high-speed camera and a spectral analyzer for joint temperature measurement.The spectral temperature measurement method offers high measurement accuracy,while the RGB three-color temperature measurement method provides high time and spatial resolution.We used the spectral temperature measurement method to correct the RGB three-color temperature measurement method,thereby improving the accuracy of the latter.We then inverted the temperature field distribution of the irradiated target,analyzed the temperature rise evolution process of the laser-irradiated target,and provided the spatial distribution of the laser-irradiated target area with time.This approach provides strong support for the effectiveness evaluation of laser irradiation targets and offers an idea for the measurement of temperature distribution in laser irradiation areas.The main contents are demonstrated as follows:1)The related principles of the combined temperature measurement technology of spectral temperature measurement and RGB three-color imaging has been discussed.2)The mathematical models of spectral temperature measurement and RGB three-color temperature measurement has been derived which is based on the theories of blackbody radiation and slowly varying emissivity,and the principle of radiation temperature measurement.The combined temperature measurement model for laser irradiation targets is given.3)We establish a finite element simulation model of laser-irradiated carbon fiber epoxy resin composites using COMSOL software,simulate the temperature field distribution of carbon fiber epoxy resin composites under the same action time and laser power,and obtain the temperature variation law of the laser-irradiated carbon fiber epoxy resin composite target.4)We establish a combined temperature measurement experimental platform for laser-irradiated carbon fiber epoxy resin composites,calibrate the spectrometer,high-speed camera,and other equipment experimentally,and carry out the combined temperature measurement experiment of laser-irradiated carbon fiber epoxy resin composites.We preprocess the experimental data and give the combined temperature measurement results by combining the mathematical model of spectral temperature measurement and the mathematical model of RGB three-color temperature measurement.Combined with the COMSOL simulation results,we compare and analyze the temperature curve of the carbon fiber epoxy resin target irradiated by different power lasers with time and provide the two-dimensional temperature field distribution of carbon fiber epoxy resin composite material under laser irradiation.In summary,the combined temperature measurement technology can not only analyze the temperature and temperature distribution of the fast-heating target but also has the advantages of accurate temperature measurement and rich information.Besides being applied to the detection of laser-irradiation targets,it is also of great significance for the detection of temperature and temperature field information of other fast-heating objects.