Research On Measurement Technology Of Ultra High Temperature Field Of Infrared Thermal Imager

With the development of infrared technology and the development of detector technology,the temperature measurement of uncooled infrared thermal imager is more and more widely used.The infrared thermal imager provides a new idea for the study of ultrahigh temperature field measurement in complex environment.According to the application requirements of ultra high temperature field measurement,the infrared radiation temperature measurement theory based on the analysis of the key technology to realize the infrared temperature measurement,the establishment of infrared thermal imager physical model,realize the measurement of ultra high temperature infrared thermal imager,and the integration of the infrared thermal imager temperature field measurement system is completed,and through the experiment,to achieve better results.According to the special demand of infrared temperature measurement,the radiant quantity obtained by the thermal imager is analyzed,and the method to realize the temperature measurement of the infrared thermal imager is deduced.In order to meet the demand of temperature measurement,this paper chooses a long wave uncooled infrared thermal imager as the research object,combines the standard radiation source blackbody to build the radiometric calibration platform,and makes a preliminary study on the performance of the customized thermal imager.The experimental results show that the detector saturation occurs at the lower temperature.In order to solve the problem,we propose a scheme to increase the saturation threshold of the detector,and further calibration experiments.Due to the adjustable integration time of thermal imaging system,a simple radiometric calibration model is established to realize the calibration of all integration time.In order to verify the accuracy of the model,the temperature inversion method was adopted to calculate the temperature measurement error,and the accuracy of infrared temperature measurement was ensured.Taking into account the temperature stability of infrared thermal imager,the corresponding performance study is conducted.Combined with infrared thermal imaging system performance evaluation criteria,the signal transfer function(SiTF),the noise equivalent temperature difference(NETD),the temperature uniformity and the temperature range of the custom infrared thermal imager are studied.The test results prove that the stable performance of the equipment,and provide a reference for the use and application of the thermal imager extension.In view of the particularity of the explosion temperature field measurement of thermal-baric explosive,the infrared temperature measurement model is established,and the precise temperature measurement of the thermal imager is studied.In order to ensure the accuracy of the experimental data,the method of PMX and TNT reference experiment was adopted.In order to simplify the operation of data processing,MATLAB is used to develop the special data processing software.The software,based on the real time explosion data,can directly display the test parameters of the explosion ultra high temperature field,which can be traceable and secondary development.At the same time,it expands the application field of thermal imager.