Methane leakage source location based on a near-infrared off-axis integrated cavity output spectroscopic ppbv-level sensor and an optimized inverse model

2022 ◽  
pp. 104021
Author(s):  
Ling Yu ◽  
Kaiyuan Zheng ◽  
Zhenhai Xi ◽  
Yixiao Zhang ◽  
Ge Yan ◽  
...  
Keyword(s):  
Near Infrared ◽  
Source Location ◽  
Inverse Model ◽  
Methane Leakage ◽  
Cavity Output ◽  
Level Sensor

Near-Infrared Off-Axis Integrated Cavity Output Spectroscopic Gas Sensor for Real-Time, In Situ Atmospheric Methane Monitoring

2020 ◽  
pp. 1-1
Author(s):  
Kaiyuan Zheng ◽  
Chuantao Zheng ◽  
Haipeng Zhang ◽  
Junhao Li ◽  
Zidi Liu ◽  
...  
Keyword(s):  
Real Time ◽  
Gas Sensor ◽  
Near Infrared ◽  
Atmospheric Methane ◽  
Cavity Output

Measurement of OH radicals using off-axis integrated output spectroscopy (OA-ICOS) at 2.8 µm

2021 ◽  
Author(s):  
Minh N. Ngo ◽  
Tong N. Ba ◽  
Denis Petitprez ◽  
Fabrice Cazier ◽  
Weixiong Zhao ◽  
...  
Keyword(s):  
Atmospheric Chemistry ◽  
Near Infrared ◽  
Limit Of Detection ◽  
Optical Cavity ◽  
High Reactivity ◽  
Oh Radicals ◽  
Wavelength Modulation ◽  
Double Line ◽  
Trace Species ◽  
Cavity Output

<p>The hydroxyl (OH) free radical plays an important role in atmospheric chemistry due to its high reactivity with volatile organic compounds (VOCs) and trace species (CH<sub>4, </sub>CO, SO<sub>2</sub>, etc) [1]. Due to its very short lifetime (~1 s or less) and very low concentration in the atmosphere (in the order of 10<sup>6</sup> cm<sup>-</sup><sup>3</sup>), in situ and direct measurement of OH concentration in the atmosphere is challenging [2].</p><p>We report in this paper our recent work on developing a compact spectroscopic instrument based on off-axis integrated cavity output spectroscopy (OA-ICOS) [3] for optical monitoring of OH radicals. In the present work, OH radicals of ~10<sup>12</sup> OH radicals/cm<sup>3</sup> were generated from continue micro-wave discharge at 2.45 GHz of water vapor at low pressure (0.2-1 mbar), and were used as sample for validation of the developed OA-ICOS approaches. Two experimental approaches are designed for the measurements of OH radicals: (1) OA-ICOS [4] and wavelength modulation enhanced OA-ICOS (WM OA-ICOS) [5]. A distributed feedback (DFB) laser operating at 2.8 µm was employed for probing the Q (1.5e) and Q (1.5f) double-line transitions of the <sup>2</sup>Π<sub>3/2</sub><sub></sub>state at 3568.52382 and 3568.41693 cm<sup>-</sup><sup>1</sup>, respectively. A 1s detection limit of ~2.7×10<sup>10</sup> cm<sup>-3</sup>  was obtained for an averaging time of 125 s using a simple OA-ICOS scheme. This limit of detection is further improved by a factor of 3.4 using a WM OA-ICOS approach.</p><p>The experimental detail and the preliminary results will be presented and discussed.</p><p><strong> </strong><strong>Acknowledgments. </strong>The authors thank the financial supports from the CPER CLIMIBIO program and the Labex CaPPA project (ANR-10-LABX005).</p><p><strong>References</strong></p><p>[1]  U. Platt, M. Rateike, W. Junkermann, J. Rudolph, and D. H. Ehhalt, New tropospheric OH measurements, J. Geophys. Res. <strong>93</strong> (1988) 5159-5166.</p><p>[2]  D. E. Heard and M. J. Pilling, Measurement of OH and HO<sub>2</sub> in the Troposphere, Chem. Rev. <strong>103</strong> (2003) 5163-5198.</p><p>[3]  J. B. Paul, L. Lapson, J. G. Anderson, Ultrasensitive absorption spectroscopy with a high-finesse optical cavity and off-axis alignment, Appl. Opt. 40 (2001) 4904-4910.</p><p>[4]  W. Chen, A. A. Kosterev, F. K. Tittel, X. Gao, W. Zhao, "H<sub>2</sub>S trace concentration measurements using Off-Axis Integrated Cavity Output Spectroscopy in the near-infrared", Appl. Phys. B 90 (2008) 311-315</p><p>[5] W. Zhao, X. Gao, W. Chen, W. Zhang, T. Huang, T. Wu, H. Cha, Wavelength modulation off-axis integrated cavity output spectroscopy in the near infrared, Appl. Phys. B 86 (2007) 353-359</p>

Ultrasensitive near-infrared integrated cavity output spectroscopy technique for detection of CO at 157 μm: new sensitivity limits for absorption measurements in passive optical cavities

2006 ◽  
Vol 45 (36) ◽  
pp. 9221 ◽  
Author(s):  
Gregory S. Engel ◽  
Walter S. Drisdell ◽  
Frank N. Keutsch ◽  
Elisabeth J. Moyer ◽  
James G. Anderson
Keyword(s):  
Near Infrared ◽  
Spectroscopy Technique ◽  
Optical Cavities ◽  
Cavity Output ◽  
Absorption Measurements

scholarly journals Near-infrared acetylene sensor system using off-axis integrated-cavity output spectroscopy and two measurement schemes

2018 ◽  
Vol 26 (20) ◽  
pp. 26205 ◽  
Author(s):  
Kaiyuan Zheng ◽  
Chuantao Zheng ◽  
Qixin He ◽  
Dan Yao ◽  
Lien Hu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Sensor System ◽  
Cavity Output

H2S trace concentration measurements using off-axis integrated cavity output spectroscopy in the near-infrared

2007 ◽  
Vol 90 (2) ◽  
pp. 311-315 ◽  
Author(s):  
W. Chen ◽  
A.A. Kosterev ◽  
F.K. Tittel ◽  
X. Gao ◽  
W. Zhao
Keyword(s):  
Near Infrared ◽  
Trace Concentration ◽  
Cavity Output ◽  
Concentration Measurements

A near-infrared C2H2/CH4 dual-gas sensor system combining off-axis integrated-cavity output spectroscopy and frequency-division-multiplexing-based wavelength modulation spectroscopy

The Analyst ◽  
2019 ◽  
Vol 144 (6) ◽  
pp. 2003-2010 ◽  
Author(s):  
Kaiyuan Zheng ◽  
Chuantao Zheng ◽  
Dan Yao ◽  
Lien Hu ◽  
Zidi Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
High Sensitivity ◽  
Dynamic Measurement ◽  
Wavelength Modulation Spectroscopy ◽  
Wavelength Modulation ◽  
Frequency Division ◽  
Modulation Spectroscopy ◽  
Cavity Output ◽  
High Finesse ◽  
High Finesse Cavity

A near-infrared C2H2/CH4 sensor was demonstrated utilizing a miniaturized high finesse cavity with high sensitivity and remarkable dynamic measurement performance.

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