通过时域复用双梳状谱方法进行的分段分辨气体浓度测量

Segment-Resolved Gas Concentration Measurements by a Time Domain Multiplexed Dual Comb Method.

作者信息

Chen Xinyi, Zhang Weipeng, Zhang Yujia, Lu Minjian, Li Yan, Wei Haoyun

机构信息

State Key Laboratory of Precision Measurement Technology & Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.

Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA.

出版信息

Sensors (Basel). 2020 Mar 11;20(6):1566. doi: 10.3390/s20061566.

DOI:10.3390/s20061566

PMID:32168966

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7146138/

Abstract

Locating gas concentration changes in widespread locations can be conducive to environmental atmospheric detection, gas emissions monitoring, production process control, etc. A time domain multiplexed dual-comb system for segment-resolved gas concentration measurement is reported in this work. Both absorption spectra and path lengths for multiple path-segments in a target path can be derived from the time domain separated interferograms and then the equivalent gas concentrations in each segment can be retrieved separately. A benchtop experiment aiming at a target path with three path-segments of different gases has been demonstrated. The relative deviation of gas concentration retrieval is 1.08% in 1 s. Besides, additional numerical simulations prove that the crosstalk between the interference signals affects the spectrum analysis by no more than 0.1% for a kilometer-long atmospheric absorption detection. Therefore, achieving a gridded measurement of regional gas concentration in the open air can be foreseen using this method.

摘要

在广泛区域定位气体浓度变化有助于环境大气检测、气体排放监测、生产过程控制等。本文报道了一种用于分段分辨气体浓度测量的时域复用双梳系统。目标路径中多个路径段的吸收光谱和路径长度均可从时域分离干涉图中导出，进而可分别获取各段的等效气体浓度。针对具有三个不同气体路径段的目标路径进行了台式实验。气体浓度反演的相对偏差在1秒内为1.08%。此外，额外的数值模拟证明，对于千米级大气吸收检测，干涉信号之间的串扰对光谱分析的影响不超过0.1%。因此，可以预见使用该方法能够实现露天区域气体浓度的网格化测量。