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Updated: Mar 20, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

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Published on: March 22, 2019

[A Methane Detection System Using Distributed Feedback Laser at 1 654 nm].

Bin Li, Hui-fang Liu, Qi-xin He

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|May 28, 2016

Summary

This summary is machine-generated.

A new methane (CH4) detection system uses tunable diode laser absorption spectroscopy (TDLAS) for accurate gas sensing. The system demonstrates a linear relationship between harmonic signal amplitude and methane concentration.

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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

Published on: June 12, 2016

Area of Science:

Optical Engineering
Spectroscopy
Gas Sensing

Context:

Methane (CH4) detection is crucial for environmental monitoring and industrial safety.
Tunable diode laser absorption spectroscopy (TDLAS) offers high sensitivity and selectivity for gas analysis.
Existing TDLAS systems require optimization for enhanced performance and stability.

Purpose:

To experimentally demonstrate a methane detection system utilizing the TDLAS technique.
To develop and test a stable laser temperature control and modulation module.
To implement an orthogonal lock-in amplifier for precise harmonic signal extraction.

Summary:

A TDLAS-based methane detection system was developed using a 1654 nm distributed feedback (DFB) laser, an open reflective probe, and InGaAs photodiodes.
The system features a laser temperature control with fluctuations within ±0.02°C and an orthogonal lock-in amplifier capable of extracting 1f and 2f harmonic signals with minimal error.
Experiments showed a linear correlation between harmonic signal amplitude and methane concentration (1-5%), confirming the system's functionality and suitability for trace gas detection.

Impact:

The developed system provides a stable and accurate method for methane detection.
The linear relationship observed enables precise quantification of methane concentrations.
The modular design allows for adaptation to detect other trace gases by employing different DFB lasers.