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Related Experiment Video

Updated: Dec 21, 2025

Three-dimensional Optical-resolution Photoacoustic Microscopy
08:31

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High-resolution random fiber laser acoustic emission sensor.

Shuaije Miao, Wentao Zhang, Ying Song

    Optics Express
    |May 15, 2020
    PubMed
    Summary

    This study introduces a novel fiber-optic acoustic emission (AE) sensor utilizing a random fiber laser (RFL) for enhanced resolution. The RFL sensor achieves high-sensitivity AE signal detection, marking a significant advancement in sensing technology.

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    Area of Science:

    • Photonics and Sensing Technologies
    • Optical Fiber Sensors
    • Acoustic Emission Detection

    Background:

    • Acoustic emission (AE) sensors are crucial for structural health monitoring.
    • Existing AE sensors face limitations in resolution and sensitivity.
    • Fiber-optic sensors offer advantages in harsh environments and electromagnetic immunity.

    Purpose of the Study:

    • To propose and demonstrate a high-resolution fiber-optic acoustic emission sensor.
    • To leverage random fiber laser (RFL) technology for improved AE signal detection.
    • To enhance the resolution of AE signal demodulation using a novel RFL-based scheme.

    Main Methods:

    • Development of a random-gratings-based erbium-doped RFL.
    • Integration of a narrow linewidth π-fiber Bragg grating (FBG) as a wavelength locking and sensing element.
    • Implementation of a 3x3 coupler interrogation technique for signal demodulation.
    • Characterization of the RFL's lasing properties and frequency noise.

    Main Results:

    • Achieved narrow lasing operation with a 20 dB linewidth of ~10.41 kHz.
    • Realized a low frequency noise of ~10 Hz/√Hz above 1 kHz.
    • Obtained a high AE signal resolution of ~280 fɛ/√Hz @ 1 kHz.
    • Demonstrated the first-time use of RFL in a 3x3 coupler AE demodulation scheme.

    Conclusions:

    • The proposed RFL-based fiber-optic AE sensor significantly improves system resolution.
    • The random distributed feedback in RFL extends cavity length, reducing thermal frequency noise.
    • This novel approach offers a promising solution for high-sensitivity acoustic emission detection.