Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors
The ideal development direction of the fiber-optic acoustic sensor (FOAS) is toward broadband, a high sensitivity and a large dynamic range. In order to further promote the acoustic detection potential of the Fabry–Pérot etalon (FPE)-based FOAS, it is of great significance to study the acoustic perf...
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MDPI AG
2022-01-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/1/118 |
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| author | Jiamin Chen Chenyang Xue Yongqiu Zheng Jiandong Bai Xinyu Zhao Liyun Wu Yuan Han |
| author_facet | Jiamin Chen Chenyang Xue Yongqiu Zheng Jiandong Bai Xinyu Zhao Liyun Wu Yuan Han |
| author_sort | Jiamin Chen |
| collection | DOAJ |
| description | The ideal development direction of the fiber-optic acoustic sensor (FOAS) is toward broadband, a high sensitivity and a large dynamic range. In order to further promote the acoustic detection potential of the Fabry–Pérot etalon (FPE)-based FOAS, it is of great significance to study the acoustic performance of the FOAS with the quality (Q) factor of FPE as the research objective. This is because the Q factor represents the storage capability and loss characteristic of the FPE. The three FOASs with different Q factors all achieve a broadband response from 20 Hz to 70 kHz with a flatness of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>±</mo></mrow></semantics></math></inline-formula>2 dB, which is consistent with the theory that the frequency response of the FOAS is not affected by the Q factor. Moreover, the sensitivity of the FOAS is proportional to the Q factor. When the Q factor is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.04</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>6</mn></msup></mrow></semantics></math></inline-formula>, the sensitivity of the FOAS is as high as 526.8 mV/Pa. Meanwhile, the minimum detectable sound pressure of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>347.33</mn><mo> </mo><mrow><mi mathvariant="sans-serif">μ</mi><mi>Pa</mi></mrow><mo>/</mo><msup><mrow><mi>Hz</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup><mo> </mo></mrow></semantics></math></inline-formula> is achieved. Furthermore, with a Q factor of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.27</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>6</mn></msup></mrow></semantics></math></inline-formula>, the maximum detectable sound pressure and dynamic range are 152.32 dB and 107.2 dB, respectively, which is greatly improved compared with two other FOASs. Separately, the FOASs with different Q factors exhibit an excellent acoustic performance in weak sound detection and high sound pressure detection. Therefore, different acoustic detection requirements can be met by selecting the appropriate Q factor, which further broadens the application range and detection potential of FOASs. |
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| spelling | doaj.art-211750b5122e4f7dbbf6babe8f9149312023-11-23T14:45:15ZengMDPI AGMicromachines2072-666X2022-01-0113111810.3390/mi13010118Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q FactorsJiamin Chen0Chenyang Xue1Yongqiu Zheng2Jiandong Bai3Xinyu Zhao4Liyun Wu5Yuan Han6The State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, ChinaThe ideal development direction of the fiber-optic acoustic sensor (FOAS) is toward broadband, a high sensitivity and a large dynamic range. In order to further promote the acoustic detection potential of the Fabry–Pérot etalon (FPE)-based FOAS, it is of great significance to study the acoustic performance of the FOAS with the quality (Q) factor of FPE as the research objective. This is because the Q factor represents the storage capability and loss characteristic of the FPE. The three FOASs with different Q factors all achieve a broadband response from 20 Hz to 70 kHz with a flatness of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>±</mo></mrow></semantics></math></inline-formula>2 dB, which is consistent with the theory that the frequency response of the FOAS is not affected by the Q factor. Moreover, the sensitivity of the FOAS is proportional to the Q factor. When the Q factor is <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.04</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>6</mn></msup></mrow></semantics></math></inline-formula>, the sensitivity of the FOAS is as high as 526.8 mV/Pa. Meanwhile, the minimum detectable sound pressure of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>347.33</mn><mo> </mo><mrow><mi mathvariant="sans-serif">μ</mi><mi>Pa</mi></mrow><mo>/</mo><msup><mrow><mi>Hz</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msup><mo> </mo></mrow></semantics></math></inline-formula> is achieved. Furthermore, with a Q factor of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>0.27</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mn>6</mn></msup></mrow></semantics></math></inline-formula>, the maximum detectable sound pressure and dynamic range are 152.32 dB and 107.2 dB, respectively, which is greatly improved compared with two other FOASs. Separately, the FOASs with different Q factors exhibit an excellent acoustic performance in weak sound detection and high sound pressure detection. Therefore, different acoustic detection requirements can be met by selecting the appropriate Q factor, which further broadens the application range and detection potential of FOASs.https://www.mdpi.com/2072-666X/13/1/118fiber-optic acoustic sensorFabry–Pérot etalonquality factorweak sound detectionhigh sound pressure detectionwide application range |
| spellingShingle | Jiamin Chen Chenyang Xue Yongqiu Zheng Jiandong Bai Xinyu Zhao Liyun Wu Yuan Han Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors Micromachines fiber-optic acoustic sensor Fabry–Pérot etalon quality factor weak sound detection high sound pressure detection wide application range |
| title | Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors |
| title_full | Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors |
| title_fullStr | Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors |
| title_full_unstemmed | Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors |
| title_short | Acoustic Performance Study of Fiber-Optic Acoustic Sensors Based on Fabry–Pérot Etalons with Different Q Factors |
| title_sort | acoustic performance study of fiber optic acoustic sensors based on fabry perot etalons with different q factors |
| topic | fiber-optic acoustic sensor Fabry–Pérot etalon quality factor weak sound detection high sound pressure detection wide application range |
| url | https://www.mdpi.com/2072-666X/13/1/118 |
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