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Fiber Bragg grating dynamic strain sensor using an adaptive reflective semiconductor optical amplifier source.

Heming Wei, Chuanyi Tao, Yinian Zhu

    Applied Optics
    |May 4, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates a novel method for high-frequency dynamic strain sensing using a reflective semiconductor optical amplifier (RSOA) and fiber Bragg grating (FBG) sensors. This system achieves megahertz response rates for accurate dynamic strain measurements.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Strain Measurement

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for strain sensing.
    • Existing demodulation techniques can be limited in dynamic range and frequency response.
    • Reflective semiconductor optical amplifiers (RSOAs) offer fast response times.

    Purpose of the Study:

    • To develop a high-frequency dynamic strain sensing system using an RSOA-FBG adaptive cavity laser.
    • To demodulate dynamic spectral shifts of FBG sensors for strain measurement.
    • To investigate optimal parameters for high sensitivity and discuss multiplexing capabilities.

    Main Methods:

    • Configuring an RSOA and FBG sensor to form an adaptive fiber cavity laser.
    • Utilizing an unbalanced Michelson interferometer to demodulate wavelength shifts into phase shifts.
    • Employing a PID controller to compensate for low-frequency drifts.

    Main Results:

    • The RSOA-FBG cavity demonstrated response to dynamic strains up to megahertz frequencies.
    • Sensitivity was optimized by adjusting optical path difference and FBG spectral width.
    • A demodulation method for dynamic spectral shifts was successfully implemented.

    Conclusions:

    • The RSOA-FBG system provides a promising approach for high-frequency dynamic strain sensing.
    • The system offers potential for multiplexing multiple FBG sensors.
    • Further optimization of parameters can enhance sensitivity and measurement accuracy.