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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Reflective temperature sensor based on a fiber Bragg grating combined with a fiber loop ringdown technique.

Bang Ning Mao, Wen Wei Chen, Chun Liu Zhao

    Applied Optics
    |July 2, 2020
    PubMed
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    A new fiber optic sensor system using a fiber loop ringdown technique offers highly sensitive temperature detection. This fiber Bragg grating (FBG) sensor achieves a resolution 14 times better than current methods.

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    Area of Science:

    • Optoelectronics
    • Fiber Optic Sensing
    • Metrology

    Background:

    • Fiber Bragg gratings (FBGs) are widely used for sensing applications.
    • Existing FBG demodulation systems face limitations in resolution and sensitivity.
    • Accurate temperature monitoring is crucial in various scientific and industrial fields.

    Purpose of the Study:

    • To propose and demonstrate a novel reflective fiber sensing system for enhanced temperature detection.
    • To improve the resolution and sensitivity of FBG-based temperature sensing.
    • To leverage a fiber loop ringdown technique for precise optical measurements.

    Main Methods:

    • A reflective fiber sensing system was designed, incorporating a fiber loop ringdown technique.
    • A fiber Bragg grating (FBG) with a center wavelength of 1543.33 nm was utilized as the sensor head.
    • Experimental measurements were conducted to evaluate system performance.

    Main Results:

    • The system demonstrated an average temperature sensitivity of 1.003 µs/°C within the 30-38°C range.
    • A high resolution of 0.007°C was achieved, representing a 14-fold improvement over current FBG sensing demodulators.
    • The proposed system exhibited robustness against optical power fluctuations.

    Conclusions:

    • The developed fiber optic sensing system offers superior temperature detection capabilities.
    • The combination of FBG and fiber loop ringdown technique provides a cost-effective and simple solution.
    • This technology holds potential for advanced temperature monitoring applications requiring high precision.