Shuguo Gao, Yunpeng Liu, Huan Li, Yuan Tian, Xiaozhou Fan, Lu Sun, Lingming Meng. Brillouin Peak Fitting Algorithm Based on Correlation-LM Method[J]. Laser & Optoelectronics Progress, 2019, 56(1): 010602
- Laser & Optoelectronics Progress
- Vol. 56, Issue 1, 010602 (2019)
Fig. 1. Illustration of original Brillouin spectrum
Fig. 2. Fitted by the cross-correlation-LM method. (a) Before and (b) after removing intrinsic signals
Fig. 3. Bimodal fitting.(a) Correlation-LM method; (b) bimodal fitting algorithm
Fig. 4. Comparison of different algorithms for fitting simulation data with the central frequency 10.75 GHz. (a) Correlation-LM method; (b) PSO method; (c) traditional LM method; (d) correlation method
Fig. 5. Schematic of bimodal fitting. (a) Bimodal distance 0.2 GHz, second peak height of 0.4; (b) bimodal distance 0.075 GHz, second peak height of 0.7
Fig. 6. Adapted transformer windings
Fig. 7. Optical diagram of transformer winding deformation detection
Fig. 8. Comparison of experimental data fitting. (a) Correlation-LM method; (b) PSO method; (c) traditional LM method; (d) correlation method
Fig. 9. Brillouin central frequency of original winding
Fig. 10. Comparison of the Brillouin central frequency between the deformed and original winding
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Table 1. Comparison of evaluation index of different fitting algorithm at different central frequencies
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