High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser
•In this manuscript, we proposed a high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot (F-P) sensor based on scanning laser.•The current was scanned step by step to obtain the wavelength lookup table. Experimental results show that the wavelength tuning ran...
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Published in | Optics and lasers in engineering Vol. 178; p. 108192 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
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01.07.2024
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Abstract | •In this manuscript, we proposed a high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot (F-P) sensor based on scanning laser.•The current was scanned step by step to obtain the wavelength lookup table. Experimental results show that the wavelength tuning range is 1546–1553 nm. 256 equally spaced wave numbers were selected from the obtained wavelength lookup table. By quickly cyclically setting the grating current and phase current of the DBR laser, the laser wavelength is scanned with a repetition frequency of 2 kHz.•Experimental results show that the cavity length demodulation resolution reaches 0.15 nm and the demodulation system has better dynamic response.•Benefiting from the high spectral detection resolution, a large demodulation range is achieved to be 0.3–13 mm. Compared with the spectrum module based demodulation system, this solution significantly reduces the cost, simplifies the algorithm and improves the dynamic range.
A high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot sensor is presented. The demodulation system only consists of a near-infrared distributed Bragg reflector (DBR) laser, a fiber circulator, a photodetector and a signal processing circuit. By quickly cyclically setting the grating current and phase current of the DBR laser, the laser wavelength is scanned with a repetition frequency of 2 kHz. The signal processing circuit controls the current of the laser and performs spectrum demodulation simultaneously. Spectral demodulation mainly includes normalization of interference spectrum, fast Fourier transform, phase estimation and cavity length calculation. The displacement stage and piezoelectric ceramics were used to remove the static cavity length and dynamic cavity length of the Fabry–Perot cavity. Experimental results show that the demodulation resolution reaches 0.15 nm. Benefiting from the high spectral detection resolution, a large demodulation range is achieved to be 0.3–13 mm. Compared with the demodulation systems based on spectrum modules, this solution significantly reduces the cost, simplifies the algorithm and improves the dynamic range. |
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AbstractList | •In this manuscript, we proposed a high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot (F-P) sensor based on scanning laser.•The current was scanned step by step to obtain the wavelength lookup table. Experimental results show that the wavelength tuning range is 1546–1553 nm. 256 equally spaced wave numbers were selected from the obtained wavelength lookup table. By quickly cyclically setting the grating current and phase current of the DBR laser, the laser wavelength is scanned with a repetition frequency of 2 kHz.•Experimental results show that the cavity length demodulation resolution reaches 0.15 nm and the demodulation system has better dynamic response.•Benefiting from the high spectral detection resolution, a large demodulation range is achieved to be 0.3–13 mm. Compared with the spectrum module based demodulation system, this solution significantly reduces the cost, simplifies the algorithm and improves the dynamic range.
A high-speed spectrum demodulation method with a large dynamic range for fiber-optic Fabry–Perot sensor is presented. The demodulation system only consists of a near-infrared distributed Bragg reflector (DBR) laser, a fiber circulator, a photodetector and a signal processing circuit. By quickly cyclically setting the grating current and phase current of the DBR laser, the laser wavelength is scanned with a repetition frequency of 2 kHz. The signal processing circuit controls the current of the laser and performs spectrum demodulation simultaneously. Spectral demodulation mainly includes normalization of interference spectrum, fast Fourier transform, phase estimation and cavity length calculation. The displacement stage and piezoelectric ceramics were used to remove the static cavity length and dynamic cavity length of the Fabry–Perot cavity. Experimental results show that the demodulation resolution reaches 0.15 nm. Benefiting from the high spectral detection resolution, a large demodulation range is achieved to be 0.3–13 mm. Compared with the demodulation systems based on spectrum modules, this solution significantly reduces the cost, simplifies the algorithm and improves the dynamic range. |
ArticleNumber | 108192 |
Author | Qi, Hongchao Li, Chenxi Zhao, Xinyu Xu, Yufu Chen, Ke |
Author_xml | – sequence: 1 givenname: Yufu surname: Xu fullname: Xu, Yufu – sequence: 2 givenname: Hongchao surname: Qi fullname: Qi, Hongchao – sequence: 3 givenname: Xinyu surname: Zhao fullname: Zhao, Xinyu – sequence: 4 givenname: Chenxi surname: Li fullname: Li, Chenxi – sequence: 5 givenname: Ke surname: Chen fullname: Chen, Ke email: chenke@dlut.edu.cn |
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CitedBy_id | crossref_primary_10_1021_acs_analchem_4c00532 crossref_primary_10_1002_mop_34258 crossref_primary_10_1021_acs_analchem_4c01480 crossref_primary_10_1080_05704928_2024_2359933 |
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Keywords | Fiber-optic Fabry–Perot sensor Spectrum demodulation Scanning laser High-speed spectral signal processing |
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Title | High-speed spectrum demodulation of fiber-optic Fabry–Perot sensor based on scanning laser |
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