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High-resolution fiber Bragg grating based transverse load sensor using microwave photonics filtering technique.

Yiping Wang, Ming Wang, Wei Xia

    Optics Express
    |August 10, 2016
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber Bragg grating (FBG) sensor uses microwave photonics filter (MPF) technology for precise transverse load sensing. This new method offers higher resolution and adjustable sensitivity compared to traditional optical spectrum analysis techniques.

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    Area of Science:

    • Photonics and Optical Sensing
    • Microwave Photonics
    • Fiber Optic Sensors

    Background:

    • Traditional transverse load sensing methods using fiber Bragg gratings (FBGs) often lack the desired resolution and sensitivity.
    • Existing optical spectrum analysis techniques can be limited in their ability to detect subtle changes in FBG characteristics under load.

    Purpose of the Study:

    • To propose and experimentally demonstrate a new fiber Bragg grating (FBG) sensor for transverse load sensing.
    • To leverage microwave photonics filter (MPF) techniques to enhance the resolution and sensitivity of FBG-based load sensing.
    • To investigate the frequency response of the MPF sensor to varying transverse loads.

    Main Methods:

    • Development of a two-tap incoherent notch microwave photonics filter (MPF) utilizing a transverse loaded FBG.
    • Integration of a polarization beam splitter (PBS), tunable delay line (TDL), and dispersion compensating fiber (DCF) within the MPF setup.
    • Analysis of the MPF's resonance frequency shifts in response to applied transverse loads.

    Main Results:

    • The proposed FBG sensor demonstrates significantly higher resolution in transverse load detection compared to traditional optical spectrum analysis methods.
    • The sensor exhibits a high sensitivity of 2.5 MHz/N for an 18mm sensing fiber length.
    • Experimental results validate the theoretical predictions of the MPF sensor's performance.

    Conclusions:

    • The novel FBG sensor employing microwave photonics filter technology provides a superior approach for transverse load sensing.
    • The MPF technique allows for adjustable sensitivity, offering flexibility for various applications.
    • This method represents a significant advancement in high-resolution, fiber optic sensing for mechanical stress detection.