Research On Three Dimensional Acoustic Ray Tracing And Temperature Field Reconstruction By Acoustic Method

Acoustic method of temperature field detection technology as a new method of measuring temperature, the technique has the advantages of wide temperature measurement range, non-contact and non interfering with the measured object, this acoustic method of temperature field detection technology also has the large measuring range and accurate measurement and so on, In the field of industrial production, scientific research and other fields can better adapt to the needs of online measurement and control of temperature field. Especially in the high temperature and harsh environment, the method has obvious advantages. Acoustic pyrometer is one of the typical technology applications in the industrial furnace temperature field monitoring. In this paper, the acoustic method of temperature field reconstruction and other issues were deeply studied, the main work is completed as follows.Introduced the principle of the acoustic method of temperature field reconstruction, and analyzes the principal factors that affect the accuracy of the temperature field reconstruction. Then, radial basis function and the singular value decomposition is introduced, and the evaluation index of the effect of temperature field reconstruction is introduced. Due to the existing temperature field reconstruction algorithm requires the measured region partition number of grid pixels must be shorter than the number of effective acoustic path, so some method for reconstruction of three-temperature field is researched. Simulation results dermonstrate that the proposed algorithm is more suitable for complex temperature field reconstruction.The path of a sound ray in the inhomogeneous temperature field can be bent due to refraction. So this paper studies the method of aural ray tracing. Introduced three kinds of commonly used ray tracing method, and two kinds of exigency method to determine the firing angle. Aiming the existing problems in the method of determining the exit angle of the acoustic line, a combination of a variety of strategies for the coarse sweep scanning method for determining the emergent angle of three-dimensional eigen acoustic ray, and the regular tetrahedron forward development method was prosed. The results show that the acoustic ray paths in three-dimensional gradient field have obvious bending effect. The method for the acoustic ray tracing can be employed in complex three-dimensional temperature field, and the acoustic CT reconstruction system.In order to improve the accuracy of the 3D reconstruction of the temperature field in the acoustic method, the temperature field reconstruction algorithm considering the bending effect of the voice line is proposed. Radial basis function and singular value decomposition method are used to reconstruct a temperature field without considering the curve of sound line, in this temperature field, the acoustic emission angle is determined by a combination of a variety of strategies and a coarse sweep sweep method, by using three-reconstruction algorithm, obtaining the intrinsic sound line between the sound wave transceiver in the temperature field, then establish the relationship between the time of sound wave propagation and the temperature distribution of the tested area, and obtain the information of temperature field distribution in the tested area. Then radial basis function and the singular value decomposition method are used to reconstruct a temperature field considering the bending of the voice line. Through simulation and reconstruction, verify the consideration of sound ray bending can reduce the non-uniform temperature field reconstruction error.