High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum
This study presents a fiber optic liquid level sensor (FOLLS) by acquiring information from the amplitude of spectral fast Fourier transform (FFT) in a specified narrow wavelength range. The sensing light path is simply formed by embedding a section of Panda-type polarization-maintaining fiber (PMF)...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/160083 |
| _version_ | 1826120852626735104 |
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| author | Wang, Shun Yang, Yaowen Zhang, Liang Mohanty, Lipi Jin, Rui-Bo Wu, Shun Lu, Peixiang |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Wang, Shun Yang, Yaowen Zhang, Liang Mohanty, Lipi Jin, Rui-Bo Wu, Shun Lu, Peixiang |
| author_sort | Wang, Shun |
| collection | NTU |
| description | This study presents a fiber optic liquid level sensor (FOLLS) by acquiring information from the amplitude of spectral fast Fourier transform (FFT) in a specified narrow wavelength range. The sensing light path is simply formed by embedding a section of Panda-type polarization-maintaining fiber (PMF) into the sensing arm of a conventional Michelson interferometer (MI) structure. The output composite spectrum consists of two parts: the fine interference fringes due to MI optical path difference (OPD) and the envelope fringes stemming from the PMF's birefringence. By applying liquid level variations on the sensing structure, shifts in envelope wavelength indicate a sensitivity of −0.193 nm/cm, and a liquid level resolution of 1 mm can be easily acquired. Furthermore, by demodulating the amplitude after spectral FFT in a specific narrow wavelength range, and intensity sensitivity of 1.906 dB/cm is achieved, leading to a greatly improved overall resolution of 0.03 mm in liquid level measurement. Besides, the sensing element is sealed and packaged by two sheets of silicone rubber, which can be thrown into liquid when in use, thus easing the sensor installation. Moreover, due to the proposed demodulation method, the sensor is insensitive to the light source power jitter, reference arm phase shift and optical spectral analyzer wavelength shift. Therefore, the merits of the proposed sensor include high precision, high stability, ease of installation, which are beneficial in pore water pressure and liquid level monitoring. |
| first_indexed | 2024-10-01T05:23:14Z |
| format | Journal Article |
| id | ntu-10356/160083 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:23:14Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1600832022-07-12T07:39:49Z High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum Wang, Shun Yang, Yaowen Zhang, Liang Mohanty, Lipi Jin, Rui-Bo Wu, Shun Lu, Peixiang School of Civil and Environmental Engineering Engineering::Civil engineering Liquid Level Sensor Polarization-Maintaining Fiber This study presents a fiber optic liquid level sensor (FOLLS) by acquiring information from the amplitude of spectral fast Fourier transform (FFT) in a specified narrow wavelength range. The sensing light path is simply formed by embedding a section of Panda-type polarization-maintaining fiber (PMF) into the sensing arm of a conventional Michelson interferometer (MI) structure. The output composite spectrum consists of two parts: the fine interference fringes due to MI optical path difference (OPD) and the envelope fringes stemming from the PMF's birefringence. By applying liquid level variations on the sensing structure, shifts in envelope wavelength indicate a sensitivity of −0.193 nm/cm, and a liquid level resolution of 1 mm can be easily acquired. Furthermore, by demodulating the amplitude after spectral FFT in a specific narrow wavelength range, and intensity sensitivity of 1.906 dB/cm is achieved, leading to a greatly improved overall resolution of 0.03 mm in liquid level measurement. Besides, the sensing element is sealed and packaged by two sheets of silicone rubber, which can be thrown into liquid when in use, thus easing the sensor installation. Moreover, due to the proposed demodulation method, the sensor is insensitive to the light source power jitter, reference arm phase shift and optical spectral analyzer wavelength shift. Therefore, the merits of the proposed sensor include high precision, high stability, ease of installation, which are beneficial in pore water pressure and liquid level monitoring. Agency for Science, Technology and Research (A*STAR) This work is supported by A*Star Science and Engineering Research Council (SERC), grant no. 1992200001, the National Natural Science Foundation of China (NSFC) (12104350), the Shenzhen Research Foundation (JCYJ20170413152328742) and the Basic and Applied Basic Research Major Program of Guangdong Province (2019B030302003). 2022-07-12T07:39:49Z 2022-07-12T07:39:49Z 2022 Journal Article Wang, S., Yang, Y., Zhang, L., Mohanty, L., Jin, R., Wu, S. & Lu, P. (2022). High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum. Measurement, 187, 110326-. https://dx.doi.org/10.1016/j.measurement.2021.110326 0263-2241 https://hdl.handle.net/10356/160083 10.1016/j.measurement.2021.110326 2-s2.0-85117404280 187 110326 en 1992200001 Measurement © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Liquid Level Sensor Polarization-Maintaining Fiber Wang, Shun Yang, Yaowen Zhang, Liang Mohanty, Lipi Jin, Rui-Bo Wu, Shun Lu, Peixiang High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title | High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title_full | High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title_fullStr | High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title_full_unstemmed | High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title_short | High-precision fiber optic liquid level sensor based on fast Fourier amplitude demodulation in a specific range of spectrum |
| title_sort | high precision fiber optic liquid level sensor based on fast fourier amplitude demodulation in a specific range of spectrum |
| topic | Engineering::Civil engineering Liquid Level Sensor Polarization-Maintaining Fiber |
| url | https://hdl.handle.net/10356/160083 |
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