Opto-Electronic Engineering, Volume. 51, Issue 9, 240143-1(2024)
Demodulation method for GaAs optical fiber temperature sensing based on reference filter and cross-correlation algorithm
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Fig. 1. Schematic diagram of demodulation method for GaAs fiber optic temperature sensing
Fig. 3. Wavelength shift curve of GaAs crystals at different temperatures (scale-down). (a) Original spectrum; (b) Filtered normalized spectrum
Fig. 4. (a) The LPF waveform after filtering and normalization processing; (b) Multi-quadratic polynomial fitting curve of cross-correlation shift number and correlation coefficient at 60 ℃
Fig. 7. Comparison of noise resistance performance of different demodulation methods under Gaussian noise with SNR ratio of 3 to 54 dB
Fig. 8. Enhancement ratio of LPF-C's noise resistance over NI and TC, in three channels
Table 1. Parameters of the RMSE indicator of normalized intensity method (NI), traditional cross-correlation algorithm (TC), and LPF reference waveform cross-correlation algorithm (LPF-C) in three channels, and average temperature demodulation error (ATDE)
View tableView in ArticleTable 1. Parameters of the RMSE indicator of normalized intensity method (NI), traditional cross-correlation algorithm (TC), and LPF reference waveform cross-correlation algorithm (LPF-C) in three channels, and average temperature demodulation error (ATDE)
Channel CH-1 CH-2 CH-3 TDA / ℃ NI 0.226123 0.208136 0.306429 0.469 TC 0.162197 0.17823 0.241403 0.408 LPF-C 0.107920 0.100972 0.115995 0.388
Table 2. Performance comparison of different demodulation methods
View tableView in ArticleTable 2. Performance comparison of different demodulation methods
Ref Year Demodulation method Temperature sensitivity Temperature demodulation accuracy Wavelength demodulation accuracy Resolution [ 22 ]2018 Wavelength demodulation 30 pm/℃ (for test) ± 0.2 ℃ 3 pm — [ 23 ]2018 Fast cross correlation demodulation algorithm based on dichotomy 0.0205 ℃/μm 0.15 ℃ — 0.001 ℃ 2019 Optical cross correlation 14.076 pixel/℃ — — 0.005 ℃ /0.6 nm [ 24 ]2023 Deep belief networks (DBNs) with ensemble learning — 0.3% F.S. TDE (temperature demodulation error)=0.98 ℃ This paper LPF-cross correlation 0.3 nm/℃ TDE=0.388 ℃ 1.6 pm —
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Yang Bi, Zhifu Xiong, Jiawen Li, Tianyu Yang, Huanhuan Liu, Huiming Wan, Yuming Dong. Demodulation method for GaAs optical fiber temperature sensing based on reference filter and cross-correlation algorithm[J]. Opto-Electronic Engineering, 2024, 51(9): 240143-1
Paper Information
Category: Article
Received: Jun. 18, 2024
Accepted: Aug. 13, 2024
Published Online: Dec. 12, 2024
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