基于量子级联激光吸收光谱法的 NOx 转化过程快速分析测量方法的开发。

Development of a Rapid Measurement Method for Analysis of the NOx Conversion Process Based on Quantum Cascade Laser Absorption Spectroscopy.

机构信息

School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China.

Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.

出版信息

Sensors (Basel). 2023 Apr 11;23(8):3885. doi: 10.3390/s23083885.

DOI:10.3390/s23083885

PMID:37112225

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10146664/

Abstract

In this study, a method for double-beam quantum cascade laser absorption spectroscopy (DB-QCLAS) was developed. Two mid-infrared distributed feedback quantum cascade laser beams were coupled in an optical cavity for the monitoring of NO and NO (NO at 5.26 μm; NO at 6.13 μm). Appropriate lines in the absorption spectra were selected, and the influence of common gases in the atmosphere, such as HO and CO, was avoided. By analyzing the spectral lines under different pressure conditions, the appropriate measurement pressure of 111 mbar was selected. Under this pressure, the interference between adjacent spectral lines could be effectively distinguished. The experimental results show that the standard deviations for NO and NO were 1.57 ppm and 2.67 ppm, respectively. Moreover, in order to improve the feasibility of this technology for detecting chemical reactions between NO and O, the standard gases of NO and O were used to fill the cavity. A chemical reaction instantaneously began, and the concentrations of the two gases were immediately changed. Through this experiment, we hope to develop new ideas for the accurate and rapid analysis of the process of NOx conversion and to lay a foundation for a deeper understanding of the chemical changes in atmospheric environments.

摘要

在本研究中，开发了一种双光束量子级联激光吸收光谱（DB-QCLAS）方法。两个中红外分布式反馈量子级联激光束在光学腔中耦合，用于监测 NO 和 NO（5.26μm 处的 NO；6.13μm 处的 NO）。选择了吸收光谱中的适当谱线，并避免了大气中常见气体（如 HO 和 CO）的影响。通过分析不同压力条件下的谱线，选择了合适的测量压力为 111mbar。在该压力下，可以有效区分相邻谱线之间的干扰。实验结果表明，NO 和 NO 的标准偏差分别为 1.57ppm 和 2.67ppm。此外，为了提高该技术检测 NO 和 O 之间化学反应的可行性，使用 NO 和 O 的标准气体填充腔室。化学反应瞬间发生，两种气体的浓度立即发生变化。通过该实验，我们希望为准确快速分析 NOx 转化过程开发新的思路，并为深入了解大气环境中的化学变化奠定基础。