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Distributed feedback fiber laser-based broadband air acoustic sensor using PI film and PEEK shell structure

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Abstract

The optical fiber air acoustic sensor has the advantages of anti-electromagnetic interference, intrinsic safety, and suitable for long-distance transmission. This paper proposes a non-metallic air acoustic sensor which is suitable for high-sensitivity concealed acoustic detection in environments such as electromagnetic interference. The sensor is based on a DFB fiber laser within an air cavity of polyimide (PI) film and poly-ether–ether–ketone (PEEK) shell. The dynamic acoustic response characteristics of the DFB fiber laser modulated by the acoustic-sensitive diaphragm is theoretically studied and numerically simulated. Based on the study and simulation results, a DFB fiber laser acoustic sensor for broadband detection covering the human auditory frequency range is designed and fabricated. An improved phase generated carrier (PGC) demodulation technique is introduced to realize high-resolution dynamic wavelength demodulation and, at the same time, to realize low sensitivity to modulation amplitude and photoelectric changes. The experimental test of the fiber laser air acoustic sensor demonstrated that, in the frequency range of 200 Hz to18 kHz, the sensitivity is − 40.39 dB re.pm/Pa, the fluctuation is less than ± 3.15 dB, and the minimum-detectable pressure (MDP) is 66.7 μPa/√Hz at 1 kHz, and the lower limit of human hearing threshold is reached.

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Funding

This work was supported by Major Science and Technology Innovation Project of Shandong Province (2019JZZY010113), Taishan Scholars Program of Shandong Province (tsqn20161061), Natural Science Foundation of Shandong Province (ZR2021MF126), National Natural Science Foundation of China (U2006216), Jinan University twenty projects (2020GXRC010&&2019GXRC028), Key Research and Development Program of Shandong Province (2020***).

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Authors and Affiliations

  1. Qilu University of Technology, Jinan, 250103, Shandong, China

    Ying-Ying Wang, Chang Wang, Fa-Xiang Zhang, Shu-Juan Li & Xiao-Mei Ma

  2. China University of Geosciences (Beijing), Beijing, 100191, China

    Ying-Ying Wang

  3. 32217 Troops of PLA, Yantai, 264000, Shandong, China

    Shi-Wei Zhao

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  1. Ying-Ying Wang
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  2. Chang Wang
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  3. Shi-Wei Zhao
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  4. Fa-Xiang Zhang
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  5. Shu-Juan Li
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Contributions

Y-YW: conceptualization, methodology, writing—original draft preparation, writing—reviewing and editing. CW: supervision. S-WZ: data curation. F-XZ: investigation. S-JL: software. X-MM: test.

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Correspondence to Ying-Ying Wang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Wang, YY., Wang, C., Zhao, SW. et al. Distributed feedback fiber laser-based broadband air acoustic sensor using PI film and PEEK shell structure. Opt Rev 29, 118–125 (2022). https://doi.org/10.1007/s10043-022-00730-7

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