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Optical fiber flow sensor based on a lever-hinge configuration.

Dongyu Zhang, Yan Bai, Guoquan Liu

    Applied Optics
    |September 14, 2023
    PubMed
    Summary
    This summary is machine-generated.

    A novel fiber Bragg grating (FBG) sensor uses a lever-hinge design for accurate temperature and flow rate measurements in injection wells. This compact sensor offers high resolution and stability for industrial applications.

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    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Mechanical Engineering

    Background:

    • Accurate monitoring of temperature and flow rate is crucial in industrial processes, particularly in injection wells.
    • Existing sensors may face limitations in compactness, resolution, or stability for demanding environments.
    • Fiber Bragg Gratings (FBGs) offer a robust platform for sensing applications due to their immunity to electromagnetic interference and multiplexing capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel target-type fiber Bragg grating (FBG) sensor based on a lever-hinge structure.
    • To achieve differential measurements of temperature and pressure for enhanced accuracy.
    • To establish the relationships between FBG wavelength shifts and measured physical parameters (temperature and volume flow rate).

    Main Methods:

    • A lever-hinge mechanical structure was designed to amplify the effect of external stimuli on two FBGs.
    • Theoretical modeling was employed to understand the sensor's operational principles.
    • Experimental investigations were conducted to validate the theoretical design and calibrate the sensor.
    • Differential wavelength measurements from the two FBGs were used to decouple temperature and flow rate effects.

    Main Results:

    • The proposed sensor successfully demonstrated the lever-hinge mechanism for FBG-based sensing.
    • The relationship between FBG wavelength and temperature was experimentally determined.
    • The relationship between FBG wavelength and volume flow rate was established, showing good correlation.
    • The sensor exhibited a compact form factor with high resolution, stability, and a wide measurement range.

    Conclusions:

    • The developed target-type FBG sensor, utilizing a lever-hinge structure, is effective for simultaneous temperature and volume flow rate measurement.
    • The sensor's characteristics (compactness, resolution, stability, ease of fabrication) make it suitable for applications in injection wells.
    • This FBG sensor technology presents a promising solution for precise monitoring in challenging industrial environments.