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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Low gas pressure sensor based on a polymer optical fiber grating.

Jitendra Narayan Dash, Xin Cheng, Hwa-Yaw Tam

    Optics Letters
    |March 2, 2021
    PubMed
    Summary

    A novel side hole polymer optical fiber (SHPOF) sensor using fiber Bragg grating (FBG) shows enhanced sensitivity for low gas pressure measurement. This advanced fiber optic sensor offers improved performance over conventional designs.

    Area of Science:

    • Materials Science
    • Optical Engineering
    • Sensor Technology

    Background:

    • Polymer optical fibers (POFs) offer advantages in sensing applications.
    • Conventional POFs face limitations in sensitivity and hysteresis for pressure measurement.
    • Novel fiber designs are needed to improve low-pressure sensing capabilities.

    Purpose of the Study:

    • To propose and demonstrate a novel side hole polymer optical fiber (SHPOF) sensor.
    • To investigate its application in low gas pressure measurement.
    • To compare its performance against conventional polymer optical fiber (CPOF).

    Main Methods:

    • Fabrication of a dopant-free SHPOF using two grades of Zeonex.
    • Inscribing a fiber Bragg grating (FBG) in the fiber core using ultrashort pulses.

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  • Characterization of the FBG sensor for pressure sensitivity and hysteresis.

    • Main Results:

    • The SHPOF sensor demonstrated enhanced pressure sensitivity (0.47 pm/kPa above atmospheric, 0.48 pm/kPa below).
    • Sensitivity was 80% higher compared to Zeonex-based CPOF.
    • The sensor exhibited low hysteresis and good performance repeatability.

    Conclusions:

    • The novel SHPOF with an inscribed FBG is effective for low gas pressure sensing.
    • The side hole design significantly improves sensitivity and reduces hysteresis.
    • This technology offers a promising solution for advanced optical pressure sensors.