Research On The 3-D Reconstruction Of Flame Based On Inversion Calculation

In the actual industrial production, the monitoring and controlling of industrial combustion flame has been the focus and difficulty of real-time monitoring control.Flame temperature control is directly related to the full use of fuel, the effective absorption of heat and the safe operation of production equipment. The flame temperature measurement of the industrial furnace is of vital importance to the safe operation of the furnace. In recent years, many scholars focused on the three-dimensional reconstruction of flame temperature field. This is of great significance for the development of instrument for measuring flame temperature field quantitatively.In this paper, a method of three-dimensional reconstruction of flame temperature field is proposed. The method first uses a filter to perform special processing on a charge coupled device (CCD) camera, so that a synchronized flame image at three different wavelengths can be captured. For each pixel in the flame image, the irradiance can be expressed as the accumulation of the emission power from the luminous flame at different temperatures in the longitudinal direction of the space, so that the radiation power can be obtained at different wavelengths according to the law of thermal radiation and the inversion calculation. By using this method, simultaneous monochromatic flame images at three different wavelengths can be obtained at the same time, so that the error of spatiotemporal matching can be avoided by the beam splitter in 3D reconstruction to improve the accuracy of 3D reconstruction.Secondly, this paper presents a calculation method of temperature field based on radiation inversion. The method is mainly aimed at the characteristics of flame combustion and temperature field distribution. The initial solution and search direction of the simulated annealing algorithm are improved. This method can avoid the blindness and complexity of the global search in the traditional simulated annealing method in calculating the inversion problem, which can quickly converge the calculation of the flame temperature field and meet the real - time requirement in the industrial production. The method of calculating the temperature field based on radiation inversion has achieved good results and accurate.