[Research on and application of hybrid optimization algorithm in Brillouin scattering spectrum parameter extraction problem].
This paper presents a novel algorithm which blends optimize particle swarm optimization (PSO) algorithm and Levenberg-Marquardt (LM) algorithm according to the probability. This novel algorithm can be used for Pseudo-Voigt type of Brillouin scattering spectrum to improve the degree of fitting and precision of shift extraction. This algorithm uses PSO algorithm as the main frame. First, PSO algorithm is used in global search, after a certain number of optimization every time there generates a random probability rand (0, 1). If rand (0, 1) is less than or equal to the predetermined probability P, the optimal solution obtained by PSO algorithm will be used as the initial value of LM algorithm. Then LM algorithm is used in local depth search and the solution of LM algorithm is used to replace the previous PSO algorithm for optimal solutions. Again the PSO algorithm is used for global search. If rand (0, 1) was greater than P, PSO algorithm is still used in search, waiting the next optimization to generate random probability rand (0, 1) to judge. Two kinds of algorithms are alternatively used to obtain ideal global optimal solution. Simulation analysis and experimental results show that the new algorithm overcomes the shortcomings of single algorithm and improves the degree of fitting and precision of frequency shift extraction in Brillouin scattering spectrum, and fully prove that the new method is practical and feasible.
Institute of Information Science and Engineering, Hebei Key Laboratary of Especial Optical Fiber and Fiber Sensor, Yanshan University, Qinhuangdao 066004, China. ysuyjzhang@yahoo.com.cn
Yan-jun
YJ
Zhang
Shu-guo
SG
Zhang
Guang-wei
GW
Fu
Da
D
Li
Yin
Y
Liu
Wei-hong
WH
Bi