Simultaneous detection of atmospheric CO2 and H2O using a DFB diode laser based absorption spectrometer

Cong Jiang; Jian Zhang; Zhenghua Xi; Weiqiang Ma; Jingsong Li

doi:10.1016/j.saa.2022.121628

Simultaneous detection of atmospheric CO₂ and H₂O using a DFB diode laser based absorption spectrometer

Spectrochim Acta A Mol Biomol Spectrosc. 2022 Nov 15:281:121628. doi: 10.1016/j.saa.2022.121628. Epub 2022 Jul 13.

Authors

Cong Jiang¹, Jian Zhang¹, Zhenghua Xi², Weiqiang Ma³, Jingsong Li⁴

Affiliations

¹ Laser Spectroscopy and Sensing Laboratory, Anhui University, 230601 Hefei, China.
² Land-Atmosphere Interaction and its Climatic Effects Group, State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101 Beijing, China; National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes, 858200 Dingri, China.
³ Land-Atmosphere Interaction and its Climatic Effects Group, State Key Laboratory of Tibetan Plateau Earth System, Resources and Environment (TPESRE), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100101 Beijing, China; College of Atmospheric Science, Lanzhou University, 730000 Lanzhou, China; National Observation and Research Station for Qomolongma Special Atmospheric Processes and Environmental Changes, 858200 Dingri, China.
⁴ Laser Spectroscopy and Sensing Laboratory, Anhui University, 230601 Hefei, China. Electronic address: ljs0625@126.com.

PMID: 35863185
DOI: 10.1016/j.saa.2022.121628

Abstract

In this paper, a high-resolution absorption spectrometer based on a continuous wave (CW) distributed feedback (DFB) diode laser near 2682.8 nm spectral region is developed, which is suitable for high sensitive detection of trace CO₂ and H₂O simultaneously. Spectral parameters (line strengths, air- and self-broadening coefficients) for CO₂ absorption line at 3727.08279 cm^-1 and H₂O absorption line at 3727.73765 cm^-1 are experimentally investigated, and a good agreement was obtained by comparing with the HITRAN database. H₂O induced CO₂ broadening coefficient is especially measured to upgrade the spectral signal processing algorithm model for field application. Finally, the developed diode laser absorption spectrometer was continuously deployed at AECORSQ Observatory onMt. Qomolangma, China, for approximate two days, which demonstrated the high sensitivity and stability of the sensor system for continuously atmospheric CO₂ and H₂O background observation.

Keywords: Atmospheric detection; CO(2) and H(2)O; DFB diode laser; Laser absorption spectroscopy; Spectroscopic parameters.