Wenjuan Sheng, Haitao Lou, Gangding Peng. Dynamic Compensation of Tunable Filter Demodulation Error Based on Least Squares Support Vector Machine and Multi-Reference Gratings[J]. Acta Optica Sinica, 2023, 43(7): 0706003
- Acta Optica Sinica
- Vol. 43, Issue 7, 0706003 (2023)
Fig. 1. Schematic diagram of dynamic modeling and compensation
Fig. 2. Schematic diagram of FBG demodulation system
Fig. 3. Principle of centroid detection algorithm
Fig. 4. Temperature trend of reference grating in cooling mode
Fig. 5. Compensation result of dynamic model in cooling mode. (a) Absolute wavelength drift; (b) prediction error
Fig. 6. Temperature trend of reference grating in cooling-heating mode
Fig. 7. Compensation result of dynamic model in cooling-heating mode. (a) Absolute wavelength drift; (b) prediction error
Fig. 8. Compensation result of dynamic model in cooling mode (n=0, n=1). (a) Absolute wavelength drift; (b) prediction error
Fig. 9. Compensation result of dynamic model in cooling mode (n=2, n=3). (a) Absolute wavelength drift; (b) prediction error
Fig. 10. Compensation result of dynamic model in cooling-heating mode (n=0, n=1). (a) Absolute wavelength drift; (b) prediction error
Fig. 11. Compensation result of dynamic model in cooling-heating mode (n=2, n=3). (a) Absolute wavelength drift; (b) prediction error
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Table 1. Characteristic wavelengths of FBG
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Table 2. Influence of location of FBG3 on model performance
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Table 3. Influence of location of FBG2 on model performance
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Table 4. Model performance under different window lengths and number of reference gratings
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