An Ultrahighly Sensitive CH 4 -TDLAS Sensor Based on an 80-m Optical Path Length Multipass Cell with a Dense Circular Spot Pattern
Harbin Institute of Technology · Zhengzhou Institute of Machinery
Abstract
In this paper, we present an ultrahighly sensitive methane (CH4) sensor based on tunable diode laser absorption spectroscopy (TDLAS), utilizing an 80-m optical path length (OPL) multipass cell (MPC) with 15 independent circles pattern. The designed MPC achieved an actual OPL of 81.58 m within a compact volume of 361 cm3, resulting in an exceptional ratio of optical path length to volume (RLV) of 22.6 cm–2. Wavelength modulation spectroscopy (WMS) was employed to minimize background noise and enhance detection performance. The CH4-TDLAS sensor demonstrated excellent linear response to CH4 concentrations. The minimum detection limit (MDL) of the sensor was determined to be 13.46 ppb. Further analysis using Allan…
Citation impact
- FWCI
- 27.31
- Percentile
- 100%
- References
- 49
Authors
5- XSXiaorong Sun
Harbin Institute of Technology, Zhengzhou Institute of Machinery
- HSHaiyue Sun
Harbin Institute of Technology, Zhengzhou Institute of Machinery
- YHYing He
Harbin Institute of Technology
- SQShunda Qiao
Harbin Institute of Technology
- YMYufei MaCorresponding
Harbin Institute of Technology, Zhengzhou Institute of Machinery
Topics & keywords
- Chemistry
- Path length
- Optical path length
- Optics
- Path (computing)
- Physics
- Affordable and clean energy