Mid-infrared laser absorption spectroscopy CO2 spectrometer

被引：0

作者：

Liu J. ^{[1
,2
]}

Pan Y. ^{[1
]}

Yao L. ^{[2
]}

Yu L. ^{[1
]}

Li H. ^{[1
]}

Kan R. ^{[2
]}

机构：

[1] College of Optoelectronic Engineering, Changchun University of Science and Technology, Changchun

[2] Anhui Institute of Optics and Fine Mechanics, Heifei Institutes of Physical Science, Chinese Academy of Sciences, Hefei

来源：

Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2024年 / 32卷 / 09期

关键词：

carbon dioxide; direct absorption; laser absorption spectroscopy; mid-infrared tunable diode laser; miniaturization;

D O I：

10.37188/OPE.20243209.1330

中图分类号：

学科分类号：

摘要：

Carbon Dioxide (CO2), as the most crucial greenhouse gas, significantly influences the regulation of Earth's climate and ecosystems. Accurately detecting trace CO2 concentrations is vital for assessing the greenhouse effect. Gas molecules exhibit strong absorption in the mid-infrared range, which is advantageous for highly sensitive trace gas detection. This paper describes the design of a compact CO2 monitoring instrument using an interband cascade laser (ICL) at 4.219 μm as the light source, paired with Tunable Diode Laser Absorption Spectroscopy (TDLAS). The instrument was calibrated with various standard gas concentrations and, using Allan variance analysis, achieved a detection limit of 16.6×10-9 with an integration time of 8.7 s, meeting the requirements for sensitive CO2 measurements in atmospheric monitoring. Additionally, the instrument was employed to monitor atmospheric CO2 over eight consecutive days and was benchmarked against the commercial LGR instrument, confirming the reliability of our miniaturized CO2 monitor and the effectiveness of combining mid-infrared light source with TDLAS technology for precise atmospheric CO2 measurement. The findings offer a technical reference for high-precision CO2 concentration detection, while the system's simple structure, compact size, low power consumption, and lightweight design are ideal for developing CO2 monitoring capabilities on airborne platforms. © 2024 Chinese Academy of Sciences. All rights reserved.

引用

页码：1330 / 1337

页数：7

共 12 条

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