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Sagnac interferometer hydrogen sensor based on panda fiber with Pt-loaded WO3/SiO2 coating
Optics Letters
|May 19, 2016
Summary
A new optical fiber sensor using Sagnac interferometer technology offers highly sensitive and rapid detection of hydrogen gas. This robust and cost-effective sensor shows promise for various hydrogen sensing applications.
Area of Science:
- Materials Science
- Optical Engineering
- Chemical Sensing
Background:
- Hydrogen gas sensing is critical for safety and industrial processes.
- Existing sensors often face limitations in sensitivity, response time, or cost.
Purpose of the Study:
- To develop and demonstrate a highly sensitive optical fiber hydrogen sensor.
- To investigate the performance characteristics of the proposed sensor design.
Main Methods:
- Fabrication of a Sagnac interferometer loop incorporating panda fiber coated with platinum-loaded tungsten oxide (Pt-loaded WO3)/silicon dioxide (SiO2).
- Utilizing the temperature change from hydrogen's exothermic reaction with the Pt/WO3 film to induce a resonant wavelength shift.
Main Results:
- The sensor demonstrated a high sensitivity of -7.877 nm/% (vol. %) within the 0%-1.0% hydrogen concentration range.
- Achieved a large extinction ratio of ~25 dB and a narrow linewidth of 2.5 nm.
- Exhibited fast response times and robustness.
Conclusions:
- The proposed optical fiber Sagnac interferometer hydrogen sensor is effective, sensitive, and fast.
- The sensor's design offers a robust, low-cost, and easily fabricated solution for hydrogen detection.
