Highly Sensitive CH4/C2H2 Dual-Component TDLAS Sensor Based on a Dual-Channel Hexagram Multi-Pass Cell
A tunable diode laser absorption spectroscopy (TDLAS) sensor with a highly sensitive dual-component for methane (CH<sub>4</sub>) and acetylene (C<sub>2</sub>H<sub>2</sub>) detection is reported in this paper for the first time. A multi-pass cell (MPC) design model was established employing a vector-based ray-tracing method. A dual-channel MPC with an interlaced dual hexagonal star pattern was designed to improve gas absorption and realize real-time synchronous detection of CH<sub>4</sub> and C<sub>2</sub>H<sub>2</sub>. During the simultaneous continuous monitoring of CH<sub>4</sub> and C<sub>2</sub>H<sub>2</sub>, the sensor exhibited an excellent linear response to concentration variations. The minimum detection limit (MDL) for CH<sub>4</sub> reached 132.08 ppb, improving to 77.32 ppb when the average time was increased to 300 s. In the case of C<sub>2</sub>H<sub>2</sub>, the MDL was measured at 20.19 ppb and further reduced to 3.50 ppb under the same extended average time.
Authors
- Shunda Qiao (ORCID: https://orcid.org/0000-0001-8709-0915)
- Ying He
- Yufei Ma
- Xinyu Liang
- Runqiu Wang
- Haiyue Sun
- Xiaorong Sun
Institutions
- Harbin Institute of Technology (CN)
Publication Details
- Journal
- Sensors
- Published
- 2026-02-15
- DOI
- https://doi.org/10.3390/s26041267
- Primary Topic
- Spectroscopy and Laser Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Natural Science Foundation of Heilongjiang Province
- Fundamental Research Funds for the Central Universities