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Updated: Jun 19, 2026
10:42
Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
[Gas pipeline leak detection based on tunable diode laser absorption spectroscopy]
Qi-Xing Zhang1, Jin-Jun Wang, Bing-Hai Liu
1State Key Laboratory of Fire Science, University of Science & Technology of China, Hefei 230027, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|October 21, 2009
Summary
This study introduces tunable diode laser absorption spectroscopy for methane detection. The developed gas sensor offers high sensitivity and selectivity for city gas pipeline leak detection.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Gas Sensing Technology
Context:
- City gas pipelines are critical infrastructure requiring reliable leak detection methods.
- Traditional methods may lack the sensitivity or selectivity needed for early-stage leak identification.
- Developing advanced sensing technologies is crucial for public safety and environmental protection.
Purpose:
- To introduce the principle of tunable diode laser absorption spectroscopy (TDLAS) combined with harmonic detection.
- To develop and evaluate an experimental device for methane measurement using TDLAS.
- To assess the sensor's performance for detecting methane in ambient air and its suitability for pipeline leak detection.
Summary:
- The study details a TDLAS system utilizing a distributed feedback diode laser targeting a methane absorption line near 1653.7 nm.
- An experimental setup with a small multi-reflection gas cell was employed for point sampling.
- The linearity between the second harmonic signal intensity and methane concentration was established, demonstrating effective background methane measurement.
Impact:
- The developed gas sensor demonstrates high sensitivity and selectivity for methane detection.
- This technology offers a promising solution for reliable and early city gas pipeline leak detection.
- TDLAS provides a non-contact, real-time monitoring capability for hazardous gas leaks.
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