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A New Hydrogen Sensor Based on SNS Fiber Interferometer with Pd/WO₃ Coating
Jinxin Shao1, Wenge Xie2, Xi Song3
1College of Information Science and Engineering, Northeastern University, Shenyang 110819, China. shaojinxin@stumail.neu.edu.cn.
Sensors (Basel, Switzerland)
|September 21, 2017
Summary
A novel fiber optic sensor using a single mode-no core-single mode (SNS) structure coated with Pd/WO₃ film offers high sensitivity and accuracy for hydrogen detection. This innovative hydrogen sensor provides a simple, cost-effective, and stable solution for monitoring hydrogen gas concentrations.
Area of Science:
- Optoelectronics
- Chemical Sensing
- Materials Science
Background:
- Accurate hydrogen detection is crucial for safety and industrial processes.
- Existing hydrogen sensors often face limitations in sensitivity, stability, or cost.
- Fiber optic sensors offer potential advantages due to their immunity to electromagnetic interference and remote sensing capabilities.
Purpose of the Study:
- To develop and demonstrate a novel hydrogen sensor based on a single mode-no core-single mode (SNS) fiber interferometer.
- To investigate the sensing performance of a Pd/WO₃ coated no core fiber (NCF) for hydrogen detection.
- To evaluate the sensitivity, linearity, accuracy, stability, and repeatability of the proposed sensor.
Main Methods:
- Fabrication of a SNS fiber interferometer structure.
- Coating the no core fiber (NCF) with a Palladium/Tungsten Trioxide (Pd/WO₃) thin film.
- Exposing the sensor to varying hydrogen concentrations and monitoring the resonant wavelength shift.
- Analyzing the relationship between hydrogen concentration and wavelength shift to determine sensor performance.
Main Results:
- The proposed sensor exhibited a high detection sensitivity of 1.26857 nm/% for hydrogen concentration.
- The sensor demonstrated good linearity and high accuracy, with a maximum hydrogen volume error of 0.0055%.
- The sensor showed excellent stability and repeatability in experimental tests.
Conclusions:
- The SNS fiber interferometer coated with Pd/WO₃ film is a highly effective hydrogen sensor.
- The sensor's performance is attributed to changes in the film's refractive index and boundary conditions affecting light propagation.
- This technology presents a promising solution for hydrogen sensing due to its simple structure, low cost, and robust performance.
