Application of Levenberg-Marquardt algorithm in the Brillouin spectrum fitting

被引：19
|
作者：
Zhang, Chuankai [1 ]
Yang, Yuanhong [1 ]
Li, Anqi [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Sch Instrumentat Sci & Optoelect Engn, Dept Measurement Control & Informat Technol, Beijing 100083, Peoples R China
来源：
SEVENTH INTERNATIONAL SYMPOSIUM ON INSTRUMENTATION AND CONTROL TECHNOLOGY: OPTOELECTRONIC TECHNOLOGY AND INSTUMENTS, CONTROL THEORY AND AUTOMATION, AND SPACE EXPLORATION | 2008年 / 7129卷
关键词：
spontaneous brillouin scatting; distributed temperature sensing; Voigt function; pseudo-Voigt function; Levenberg-Marquardt algorithm; nonlinear curve fitting;
D O I：
10.1117/12.807646
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Brillouin distributed optical fiber sensing system based on spontaneous Brillouin scattering frequency shift measurement may measure temperature in the optical fiber, due to the dependence of spontaneous Brillouin scattering frequency shift on temperature. In this paper, nonlinear theoretical models of the Brillouin spectrum in the BOTDR temperature sensing system are analyzed. The model parameters are optimized with Levenberg-Marquardt algorithm. By numerical calculation, it is indicated that pseudo-Voigt function can approach approximated the Voigt profile well and quickly.
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页数：7
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