Dual-laser cavity ring-down spectroscopy for real-time, long-term measurement of trace moisture in gas

2018 ◽  
Vol 30 (1) ◽  
pp. 015002
Author(s):  
Hisashi Abe ◽  
Koji Hashiguchi ◽  
Daniel Lisak
Keyword(s):  
Real Time ◽  
Laser Cavity ◽  
Cavity Ring Down Spectroscopy ◽  
Trace Moisture ◽  
Long Term Measurement ◽  
Dual Laser ◽  
Cavity Ring Down

scholarly journals System for <i>δ</i><sup>13</sup>C–CO<sub>2</sub> and <i>x</i>CO<sub>2</sub> analysis of discrete gas samples by cavity ring-down spectroscopy

2017 ◽  
Vol 10 (11) ◽  
pp. 4507-4519 ◽  
Author(s):  
Dane Dickinson ◽  
Samuel Bodé ◽  
Pascal Boeckx
Keyword(s):  
Measurement Techniques ◽  
Cavity Ring Down Spectroscopy ◽  
Ratio Measurement ◽  
Pee Dee ◽  
Aggregate Sample ◽  
Scope Of Application ◽  
Gas Standards ◽  
Set Up ◽  
Cavity Ring Down

Abstract. A method was devised for analysing small discrete gas samples (50 mL syringe) by cavity ring-down spectroscopy (CRDS). Measurements were accomplished by inletting 50 mL syringed samples into an isotopic-CO2 CRDS analyser (Picarro G2131-i) between baseline readings of a reference air standard, which produced sharp peaks in the CRDS data feed. A custom software script was developed to manage the measurement process and aggregate sample data in real time. The method was successfully tested with CO2 mole fractions (xCO2) ranging from  <  0.1 to  >  20 000 ppm and δ13C–CO2 values from −100 up to +30 000 ‰ in comparison to VPDB (Vienna Pee Dee Belemnite). Throughput was typically 10 samples h−1, with 13 h−1 possible under ideal conditions. The measurement failure rate in routine use was ca. 1 %. Calibration to correct for memory effects was performed with gravimetric gas standards ranging from 0.05 to 2109 ppm xCO2 and δ13C–CO2 levels varying from −27.3 to +21 740 ‰. Repeatability tests demonstrated that method precision for 50 mL samples was ca. 0.05 % in xCO2 and 0.15 ‰ in δ13C–CO2 for CO2 compositions from 300 to 2000 ppm with natural abundance 13C. Long-term method consistency was tested over a 9-month period, with results showing no systematic measurement drift over time. Standardised analysis of discrete gas samples expands the scope of application for isotopic-CO2 CRDS and enhances its potential for replacing conventional isotope ratio measurement techniques. Our method involves minimal set-up costs and can be readily implemented in Picarro G2131-i and G2201-i analysers or tailored for use with other CRDS instruments and trace gases.

Diode Laser Cavity Ring-Down Spectroscopy for Atmospheric NO2Measurement

2016 ◽  
Vol 36 (2) ◽  
pp. 0230006 ◽  
Author(s):  
胡仁志 Hu Renzhi ◽  
王丹 Wang Dan ◽  
谢品华 Xie Pinhua ◽  
陈浩 Chen Hao ◽  
凌六一 Ling Liuyi
Keyword(s):  
Diode Laser ◽  
Laser Cavity ◽  
Cavity Ring Down Spectroscopy ◽  
Cavity Ring Down

Detection of chemical warfare agents based on quantum cascade laser cavity ring-down spectroscopy

2012 ◽  
Vol 10 (5) ◽  
pp. 050102-50104 ◽  
Author(s):  
Zhechao Qu Zhechao Qu ◽  
Chunming Gao Chunming Gao ◽  
Yanling Han Yanling Han ◽  
Xiaosong Du Xiaosong Du ◽  
Bincheng Li Bincheng Li
Keyword(s):  
Quantum Cascade Laser ◽  
Chemical Warfare Agents ◽  
Laser Cavity ◽  
Chemical Warfare ◽  
Cavity Ring Down Spectroscopy ◽  
Quantum Cascade ◽  
Warfare Agents ◽  
Cavity Ring Down
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