Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths
A phase interrogation method for a fiber-optic acoustic sensor based on a short-cavity extrinsic Fabry–Perot interferometer (EFPI) is proposed with two wavelengths. A multichannel tunable optical filter is employed, which selects out two monochromatic beams from the broadband interference...
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IEEE
2017-01-01
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| Serie: | IEEE Photonics Journal |
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| Accesso online: | https://ieeexplore.ieee.org/document/7890391/ |
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| _version_ | 1839645091778527232 |
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| author | Hao Liao Ping Lu Li Liu Shun Wang Wenjun Ni Xin Fu Deming Liu Jiangshan Zhang |
| author_facet | Hao Liao Ping Lu Li Liu Shun Wang Wenjun Ni Xin Fu Deming Liu Jiangshan Zhang |
| author_sort | Hao Liao |
| collection | DOAJ |
| description | A phase interrogation method for a fiber-optic acoustic sensor based on a short-cavity extrinsic Fabry–Perot interferometer (EFPI) is proposed with two wavelengths. A multichannel tunable optical filter is employed, which selects out two monochromatic beams from the broadband interference spectrum of EFPI with fixed wavelength interval. The influence of the wavelength interval on the recovery of the phase signal has been theoretically and experimentally analyzed. To get the best sensitivity, the wavelength interval is fixed at one quarter of the period of sensor interference fringes. An optimized differential cross multiplication algorithm is utilized to demodulate the acoustic signal, which can eliminate the impact of optical power imbalance between the two light paths. This system may be a universal phase demodulation unit for short-cavity EFPI acoustic sensors. The EFPI acoustic sensing head is formed by an aluminum-attached polyethylene terephthalate membrane and a cleaved fiber tip. The sensor interrogated by the proposed demodulation system demonstrated large dynamic range in low-frequency domain under high sound pressure. A signal-to-noise ratio (SNR) of ∼53 dB is obtained at 80 Hz. These features make the sensor especially suitable for noise detection. |
| format | Article |
| id | doaj-art-771c2ebc24f1480da50ea2c2a11f296a |
| institution | Matheson Library |
| issn | 1943-0655 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-771c2ebc24f1480da50ea2c2a11f296a2025-07-01T23:27:58ZengIEEEIEEE Photonics Journal1943-06552017-01-01921910.1109/JPHOT.2017.26897717890391Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two WavelengthsHao Liao0Ping Lu1Li Liu2Shun Wang3Wenjun Ni4Xin Fu5Deming Liu6Jiangshan Zhang7Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaLaboratory of Optical Information Technology, Wuhan Institution of Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, ChinaDepartment of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan, ChinaA phase interrogation method for a fiber-optic acoustic sensor based on a short-cavity extrinsic Fabry–Perot interferometer (EFPI) is proposed with two wavelengths. A multichannel tunable optical filter is employed, which selects out two monochromatic beams from the broadband interference spectrum of EFPI with fixed wavelength interval. The influence of the wavelength interval on the recovery of the phase signal has been theoretically and experimentally analyzed. To get the best sensitivity, the wavelength interval is fixed at one quarter of the period of sensor interference fringes. An optimized differential cross multiplication algorithm is utilized to demodulate the acoustic signal, which can eliminate the impact of optical power imbalance between the two light paths. This system may be a universal phase demodulation unit for short-cavity EFPI acoustic sensors. The EFPI acoustic sensing head is formed by an aluminum-attached polyethylene terephthalate membrane and a cleaved fiber tip. The sensor interrogated by the proposed demodulation system demonstrated large dynamic range in low-frequency domain under high sound pressure. A signal-to-noise ratio (SNR) of ∼53 dB is obtained at 80 Hz. These features make the sensor especially suitable for noise detection.https://ieeexplore.ieee.org/document/7890391/Acoustic sensorextrinsic Fabry–Perot interferometer (EFPI) sensorphase demodulationtwo wavelengths. |
| spellingShingle | Hao Liao Ping Lu Li Liu Shun Wang Wenjun Ni Xin Fu Deming Liu Jiangshan Zhang Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths IEEE Photonics Journal Acoustic sensor extrinsic Fabry–Perot interferometer (EFPI) sensor phase demodulation two wavelengths. |
| title | Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths |
| title_full | Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths |
| title_fullStr | Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths |
| title_full_unstemmed | Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths |
| title_short | Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths |
| title_sort | phase demodulation of short cavity fabry perot interferometric acoustic sensors with two wavelengths |
| topic | Acoustic sensor extrinsic Fabry–Perot interferometer (EFPI) sensor phase demodulation two wavelengths. |
| url | https://ieeexplore.ieee.org/document/7890391/ |
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