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Fiber Bragg grating (FBG)-based Hydrophone with side-hole packaging for underwater acoustic sensing

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Abstract

This paper reports design and development of a Fiber Bragg grating (FBG)-based hydrophone with side-hole packaging, for underwater acoustic sensing. The sensing mechanism relies on the variation of birefringence in FBG region under the influence of acoustic pressure. Embedding FBG inside the side-hole package maximizes the pressure on the FBG portion compared with bare FBG. Simulation studies are carried out to optimize the conditions suitable for the packaging and are supported by experimental studies. With the sensor package, a pressure sensitivity of 3200 pm/MPa is achieved which is in good agreement with the simulation results.

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Authors and Affiliations

  1. Asymmetric Technologies (DYSL-AT), Hyderabad, Telangana State, 500043, India

    P. Siva Prasad

  2. Department of Instrumentation and Applied Physics, Indian Institute of Science, Bangalore, Karnataka, 560012, India

    S. Asokan

  3. Center for High Energy Systems and Sciences (CHESS), Hyderabad, Telangana, 500069, India

    Jaganath Nayak

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  1. P. Siva Prasad
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  2. S. Asokan
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  3. Jaganath Nayak
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Correspondence to P. Siva Prasad.

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Prasad, P.S., Asokan, S. & Nayak, J. Fiber Bragg grating (FBG)-based Hydrophone with side-hole packaging for underwater acoustic sensing. ISSS J Micro Smart Syst 10, 119–125 (2021). https://doi.org/10.1007/s41683-021-00077-2

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  • DOI: https://doi.org/10.1007/s41683-021-00077-2

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