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High-performance fiber-optic temperature sensor using low-coherence interferometry.

H S Choi, H F Taylor, C E Lee

    Optics Letters
    |January 12, 2008
    PubMed
    Summary
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    A novel fiber optic temperature sensor system was developed using low-coherence interferometry. This system achieves high resolution for precise temperature measurements across a wide range.

    Area of Science:

    • Optics and Photonics
    • Sensor Technology
    • Materials Science

    Background:

    • Accurate temperature sensing is crucial in various industrial and scientific applications.
    • Traditional sensors face limitations in harsh environments or demanding measurement ranges.
    • Fiber optic sensors offer advantages like immunity to electromagnetic interference and remote sensing capabilities.

    Purpose of the Study:

    • To implement a fiber optic temperature-sensor system.
    • To leverage low-coherence interferometry for enhanced temperature measurement.
    • To utilize a fiber Mach-Zehnder interferometer as a phase modulator.

    Main Methods:

    • A fiber Mach-Zehnder interferometer was employed as a phase modulator.
    • A 1-mm-long fiber Fabry-Perot interferometer served as the sensing element.

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  • Low-coherence interferometry principles were applied for signal processing.

    • Main Results:

    • The implemented system demonstrated a wide measurement range from 20 to 800 degrees C.
    • A high resolution of 0.025 degrees C was achieved.
    • This resolution corresponds to a fringe shift sensitivity of 0.0004.

    Conclusions:

    • The developed low-coherence interferometry-based system is effective for high-temperature sensing.
    • The use of fiber optic components enables robust and precise temperature measurements.
    • The system shows potential for applications requiring accurate temperature monitoring in extreme conditions.