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Intracavity absorption multiplexed sensor network based on dense wavelength division multiplexing filter.

Haiwei Zhang, Ying Lu, Liangcheng Duan

    Optics Express
    |October 17, 2014
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    This study introduces a novel intracavity absorption multiplexed sensor network using hollow core photonic crystal fiber sensors and dense wavelength division multiplexing filters for gas detection. The system achieves high sensitivity and enhanced detection efficiency through voltage gradient optimization.

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    Area of Science:

    • Photonics and Sensor Technology
    • Optical Sensing
    • Gas Detection Systems

    Background:

    • Intracavity absorption spectroscopy offers high sensitivity for gas detection.
    • Multiplexed sensor networks are crucial for simultaneous monitoring of multiple analytes.
    • Hollow core photonic crystal fibers (HCPCFs) provide unique light-matter interaction properties.

    Purpose of the Study:

    • To design and experimentally verify an intracavity absorption multiplexed sensor network.
    • To integrate HCPCF sensors with dense wavelength division multiplexing (DWDM) filters for enhanced performance.
    • To demonstrate the capability for multi-gas concentration detection.

    Main Methods:

    • System design incorporating HCPCF sensors and DWDM filters within an optical cavity.
    • Experimental setup for intracavity absorption measurements.
    • Utilization of voltage gradient for optimizing sensor network efficiency.
    • Concentration detection of acetylene gas in three separate cells.

    Main Results:

    • Successful implementation of an intracavity absorption multiplexed sensor network.
    • Achieved a sensitivity of 100 ppmV for acetylene detection at 1536.71 nm.
    • Enhanced detection efficiency by up to 6.5 times using voltage gradient optimization.
    • Demonstrated the novel use of DWDM filters for multiplexing in this sensor network configuration.

    Conclusions:

    • The developed sensor network enables high-capacity, multiplexed gas sensing.
    • DWDM filters offer a stable and effective alternative to Fiber Bragg Gratings for multiplexing.
    • The integration of HCPCF and DWDM presents a promising advancement in optical sensing technology.