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Multimode fiber-optic hydrophone based on a schlieren technique.

W B Spillman

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel fiber-optic hydrophone utilizing schlieren acoustooptic modulation. The device achieves remarkable sensitivity, detecting minute displacements and Knudsen noise, offering a wide dynamic range for underwater acoustic measurements.

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    Area of Science:

    • Acousto-optics
    • Fiber optics
    • Hydroacoustics

    Background:

    • Traditional hydrophones face limitations in sensitivity and susceptibility to noise.
    • Developing passive, electrically inert underwater acoustic sensors is crucial for advanced surveillance and research.

    Purpose of the Study:

    • To describe a novel multimode fiber-optic hydrophone.
    • To investigate its performance using computer modeling and experimental verification.
    • To assess its potential for detecting low-level acoustic signals.

    Main Methods:

    • Utilized a schlieren acoustooptic intensity modulation mechanism.
    • Performed computer modeling of critical device parameters.
    • Conducted experimental verification of the model and device performance.

    Main Results:

    • The fiber-optic hydrophone demonstrated detection of Knudsen noise up to 1 kHz.
    • Achieved a dynamic range of 125 dB and an omnidirectional receiving response.
    • Capable of detecting displacements as small as 3.4 x 10(-3) Angstroms.
    • Exhibited insensitivity to phase noise and static pressure variations.

    Conclusions:

    • The developed fiber-optic hydrophone offers high sensitivity and a wide dynamic range.
    • Its passive and robust nature makes it suitable for demanding underwater acoustic applications.
    • The device performance validates the schlieren acoustooptic modulation approach for hydrophone design.