An Investigation Of New Methods On Depth Profile Recognition Based On Photoacoustic And Photothermal Detect Technology

Based on testing technology of photoacoustic and photothermal as the background and using relevant mathematical physics theory and modern mathematics inversion optimization theory, we research the distribution reconstruction technique of light absorption coefficient or function of heat source of non-uniform material and double parameters synchronous inversion problems of the heat transfer coefficient and specific heat capacity coefficient.In research of distribution reconstruction of material optical parameters, first use two different mathematical method, we get the analytical solution of the green’s function heat transfer model. Based on this concept through the analysis of intrinsic properties of inverse model and disturbance analysis of noise to the signal, according to the defects of singular value decomposition or singular value decomposition method which present wildly used in the inverse problem, a new way is established which can choose cut-off point automatically according to the error of signal. We found a new way of practical online inversion.In synchronous inversion research and exploration of more material parameters, We first use the two mathematical methods which are stratification and green function to get stability solution of heat transfer model. Based on this concept, we use the iterative method of generalized Newton, singular value decomposition method and regular method to establish the inversion algorithm and achieve more parameters synchronous distribution reconstruction...