Chinese Journal of Quantum Electronics ›› 2026, Vol. 43 ›› Issue (4): 612-622.doi: 10.3969/j.issn.1007-5461.2026.04.010

• Spectroscopy • Previous Articles     Next Articles

Research on a multiple‐optical‐pathlength and high‐precision trace gas detection system based on White cell

CHEN Wei 1,2 , XU Liang 2* , XU Huanyao 1,2 , HUA Gubiao 1,2 , XU Hanyang2 , XU Jiaqiu3 , PAN Shuai 3   

  1. 1 University of Science and Technology of China, Hefei 230026, China; 2 Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; 3 Hefei Zhongke Infrared Precision Instrument Co., Ltd., Hefei 230022, China
  • Received:2023-10-07 Revised:2023-11-01 Published:2026-07-28 Online:2026-07-27
  • Supported by:

Abstract: In response to the challenges of fixed optical path-length and limited flexibility in traditional Fourier transform infrared spectroscopy systems, a novel high-precision trace gas detection system with multiple optical pathlengths was developed in this work by utilizing a dual-corner mirror design within a White cell. The large mirror of the system can display six rows of light spots, with the number of spots in each row adjustable from 2 to 9. This flexibility enables the White cell to achieve eight different optical path reflections, resulting in eight distinct absorption path lengths of 48, 72, 96, 120, 144, 168, 192, and 216 m. Preliminary experimental research based on this system showed that, the measurement precision for CO and N2O was estimated to be 4.08 nmol/mol and 1.44 nmol/mol, respectively, demonstrating the system's capability of achieving high-precision gas concentration measurements.

Key words: spectroscopy, multiple optical pathlengths, dual-corner mirror, Fourier transform infrared spectrometer, White cell

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