An improved Levenberg-Marquardt algorithm for extracting the features of Brillouin scattering spectrum

作者：Zhang Yanjun^*; Li Da; Fu Xinghu; Bi Weihong

来源：Measurement Science and Technology, 2013, 24(1): 015204.

DOI：10.1088/0957-0233/24/1/015204

• Brillouin scattering spectrum
• Levenberg-Marquardt algorithm
• finite element analysis
• distributed fiber sensors

To extract the features of the Brillouin scattering spectrum in distributed sensing systems, an improved Levenberg-Marquardt (L-M) algorithm based on finite element analysis (FEA-LM algorithm) is proposed. The simulation data of different linewidth and signal-to-noise ratio (SNR) are analyzed by using the FEA-LM algorithm and the Brillouin center frequency shifts are extracted. The operational precision of the L-M and FEA-LM algorithms are compared in a certain range of initial value. The result shows that the FEA-LM algorithm can be appropriate for extracting the feature of the Brillouin scattering spectrum with different linewidth and SNR. Moreover, it has an advantage in precision by comparing with the L-M algorithm.

• 出版日期2013-1
• 单位燕山大学