RES-Q-Trace: A Multicomponent Trace Gas Detection System Based on Infrared Cavity Enhanced Absorption Spectroscopy

2015 ◽  
Author(s):  
Juergen Roepcke
Keyword(s):  
Absorption Spectroscopy ◽  
Detection System ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

scholarly journals Using a high finesse optical resonator to provide a long light path for differential optical absorption spectroscopy: CE-DOAS

2008 ◽  
Vol 8 (3) ◽  
pp. 10665-10695 ◽  
Author(s):  
J. Meinen ◽  
J. Thieser ◽  
U. Platt ◽  
T. Leisner
Keyword(s):  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Light Emitting Diode ◽  
Gas Detection ◽  
Trace Gas ◽  
Light Path ◽  
Trace Gas Detection ◽  
Light Emitting ◽  
Detection Techniques ◽  
Enhanced Absorption

Abstract. Cavity enhanced methods in absorption spectroscopy have seen a considerable increase in popularity during the past decade. Especially Cavity Enhanced Absorption Spectroscopy (CEAS) established itself in atmospheric trace gas detection by providing tens of kilometers of effective light path length using a cavity as short as 1 m. In this paper we report on the construction and testing of a compact and power efficient light emitting diode based broadband Cavity Enhanced Differential Optical Absorption Spectrometer (CE-DOAS) for in situ field observation of atmospheric NO3. This device combines the small size of the cavity with the enormous advantages of the DOAS approach in terms of sensitivity and specificity. In particular, no selective removal of the analyte (here NO3) is necessary, thus the CE-DOAS technique can – in principle – measure any gas detectable by DOAS. We will discuss the advantages of using a light emitting diode (LED) as light source particularly the precautions which have to be satisfied for the use of LEDs. The instrument was tested in the lab by detecting NO3 in a mixture of NO2 and O3 in air. It was then compared to other trace gas detection techniques in an intercomparison campaign in the atmosphere simulation chamber SAPHIR at NO3 concentrations as low as 6.3 ppt.

scholarly journals Mid-Infrared Tunable Laser-Based Broadband Fingerprint Absorption Spectroscopy for Trace Gas Sensing: A Review

2019 ◽  
Vol 9 (2) ◽  
pp. 338 ◽  
Author(s):  
Zhenhui Du ◽  
Shuai Zhang ◽  
Jinyi Li ◽  
Nan Gao ◽  
Kebin Tong
Keyword(s):  
Absorption Spectroscopy ◽  
Gas Sensing ◽  
Tunable Laser ◽  
Gas Detection ◽  
Trace Gas ◽  
Spectroscopic Techniques ◽  
Trace Gas Detection ◽  
Absorption Bands ◽  
Mid Infrared ◽  
Broadband Absorption

The vast majority of gaseous chemical substances exhibit fundamental rovibrational absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light by these fundamental bands provides a nearly universal means for their detection. A main feature of optical techniques is the non-intrusive in situ detection of trace gases. We reviewed primarily mid-infrared tunable laser-based broadband absorption spectroscopy for trace gas detection, focusing on 2008–2018. The scope of this paper is to discuss recent developments of system configuration, tunable lasers, detectors, broadband spectroscopic techniques, and their applications for sensitive, selective, and quantitative trace gas detection.

scholarly journals Application of Near-Infrared Optical Feedback Cavity Enhanced Absorption Spectroscopy (OF-CEAS) to the Detection of Ammonia in Exhaled Human Breath

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3686
Author(s):  
Zhifu Luo ◽  
Zhongqi Tan ◽  
Xingwu Long
Keyword(s):  
Detection Limit ◽  
Absorption Spectroscopy ◽  
Spectral Resolution ◽  
Optical Feedback ◽  
Low Pressure ◽  
High Spectral Resolution ◽  
Trace Gas ◽  
Human Breath ◽  
Enhanced Absorption ◽  
Cavity Enhanced Absorption Spectroscopy

The qualitative and quantitative analysis to trace gas in exhaled human breath has become a promising technique in biomedical applications such as disease diagnosis and health status monitoring. This paper describes an application of a high spectral resolution optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) for ammonia detection in exhaled human breath, and the main interference of gases such as CO2 and H2O are approximately eliminated at the same time. With appropriate optical feedback, a fibered distributed feedback (DFB) diode laser emitting at 1531.6 nm is locked to the resonance of a V-shaped cavity with a free spectral range (FSR) of 300 MHz and a finesse of 14,610. A minimum detectable absorption coefficient of αmin = 2.3 × 10−9 cm−1 is achieved in a single scan within 5 s, yielding a detection limit of 17 ppb for NH3 in breath gas at low pressure, and this stable system allows the detection limit down to 4.5 ppb when the spectra to be averaged over 16 laser scans. Different from typical CEAS with a static cavity, which is limited by the FSR in frequency space, the attainable spectral resolution of our experimental setup can be up to 0.002 cm−1 owing to the simultaneous laser frequency tuning and cavity dither. Hence, the absorption line profile is more accurate, which is most suitable for low-pressure trace gas detection. This work has great potential for accurate selectivity and high sensitivity applications in human breath analysis and atmosphere sciences.

Compact mid-infrared trace gas detection system based on TDLAS and ICL

2018 ◽  
Vol 26 (8) ◽  
pp. 1855-1861
Author(s):  
李春光 LI Chun-guang ◽  
董 磊 DONG Lei ◽  
王一丁 WANG Yi-ding ◽  
林 君 LIN Jun
Keyword(s):  
Detection System ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Mid Infrared
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