Simultaneous atmospheric CO, N2O and H2O detection using a single quantum cascade laser sensor based on dual-spectroscopy techniques

被引：135
作者：
Li, Jingsong [1 ]
Deng, Hao [1 ]
Sun, Juan [1 ]
Yu, Benli [1 ]
Fischer, Horst [2 ]
机构：
[1] Anhui Univ, Minist Educ, Key Lab Optoelect Informat Acquisit & Manipulat, Hefei, Peoples R China
[2] Max Planck Inst Chem, Hahn Meitner Weg 1, D-55128 Mainz, Germany
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2016年 / 231卷
基金：
中国国家自然科学基金;
关键词：
QCL; Carbon monoxide; Nitrous oxide; Water vapor; DAS; WMS; WAVELENGTH-MODULATION SPECTROSCOPY; BROADENING COEFFICIENTS; GAS DETECTION; REAL-TIME; METHANE; BREATH; CH4;
D O I：
10.1016/j.snb.2016.03.089
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A single continuous wave (CW) room-temperature (RT) quantum cascade laser (QCL) sensor based on dual spectroscopic techniques was demonstrated and developed for simultaneous measurement of atmospheric carbon monoxide (CO), nitrous oxide (N2O) and water vapor (H2O). The newly developed detection scheme combines the benefits of absolute concentration measurements using calibration free direct absorption spectroscopy (DAS) with higher sensitive wavelength modulation spectroscopy (WMS), which offers the possibility of calibration-free trace gases concentration detection with a 3-4 fold improvement in measurement precision and a significant decrease in optimal signal averaging time. By using the DAS calibrated WMS-2f detection scheme, Allan deviation analysis indicates that measurement precision of 1.64 ppb for CO, 1.15 ppb for N2O and 50.4 ppm for H2O was achieved with a 1-s integration time, which can be further improved to 0.21 ppb, 0.18 ppb and 5.65 ppm by averaging up to 75 s. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：723 / 732
页数：10
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