Structure Optimization Design Of High Temperature Blackbody Cavity Sensor

Black body cavity is widely used in all profession of temperature measurement system, the development of the relevant profession also puts forward higher requirements on temperature measurement, therefore, to design the cavity of reasonable structure to improve the emissivity of the black body cavity become the main research content in the field of research.In this paper, a kind of using the contact- non-contact temperature measuring method to measure the high temperature named black body cavity sensor is studied, respectively using the integral equation method, Monte-Carlo method and finite element analysis to set up the black body cavity model and carry on the simulation analysis, discussing how the various parameters of the black body cavity temperature sensor influence the integral emissivity in order to achieve the goal of sensor structure optimization designing.The main contents of this thesis are as follows:Firstly,given the basic idea of the integral equation method and finite element analysis, established the cylindrical and conical cavity blackbody cavity model based on the above two methods, and then solving their integral emissivity, analyzing how the geometry parameters such as different aspect ratio?aperture ratio and the different material emissivity influence the integral emissivity.Then, given the core idea of Monte-Carlo method, introduced the basic theory of blackbody radiation, established the Monte-Carlo model of cylindrical and conical cavity blackbody cavity,and then calculated blackbody cavity integral emissivity based on ray tracing algorithm, change the geometry parameters of the blackbody cavity to observe how the size of the black body cavity emissivity change with the different geometric structure, determine the optimum structure parameters blackbody cavity by changing the parameters.Finally, compared and analyzed the results of three methods, pointed out the advantage and disadvantage of each method, and pointed out the finite element analysis method and Monte-Carlo method overcome the problem of the difficulty of the modeling of the complex cavity, improve the calculation speed. Through the three methods check each other, the high temperature black body cavity sensor structure optimization design is concluded.