Near-confocal cavity-enhanced Raman spectroscopy for multitrace-gas detection

2008 ◽  
Vol 33 (18) ◽  
pp. 2143 ◽  
Author(s):  
Xiaoyun Li ◽  
Yuxing Xia ◽  
Li Zhan ◽  
Juming Huang
Keyword(s):  
Raman Spectroscopy ◽  
Gas Detection ◽  
Confocal Cavity

Trace gas detection using cavity-enhanced Raman spectroscopy with injection locking

2018 ◽  
Vol 26 (8) ◽  
pp. 1917-1924 ◽  
Author(s):  
王品一 WANG Pin-yi ◽  
万 福 WAN Fu ◽  
王建新 WANG Jian-xin ◽  
陈伟根 CHEN Wei-gen ◽  
朱承治 ZHU Cheng-zhi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Injection Locking ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection

Nonlinear Raman spectroscopy without tunable laser for sensitive gas detection in the atmosphere

1999 ◽  
Vol 161 (1-3) ◽  
pp. 57-62 ◽  
Author(s):  
Yuji Oki ◽  
Noriyuki Kawada ◽  
Yoshiteru Abe ◽  
Mitsuo Maeda
Keyword(s):  
Raman Spectroscopy ◽  
Tunable Laser ◽  
Gas Detection

scholarly journals Underwater In Situ Dissolved Gas Detection Based on Multi-Reflection Raman Spectroscopy

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4831
Author(s):  
Meng Li ◽  
Qingsheng Liu ◽  
Dewang Yang ◽  
Jinjia Guo ◽  
Ganshang Si ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Hydrothermal Vents ◽  
Hollow Fiber Membrane ◽  
Gas Detection ◽  
Cold Seep ◽  
Lower Sensitivity ◽  
Dissolved Gas ◽  
In Situ Raman Spectroscopy ◽  
Short Period

The detection of dissolved gases in seawater plays an important role in oceanic observations and exploration. As a potential technique for oceanic applications, Raman spectroscopy has been successfully applied in hydrothermal vents and cold seep fluids, but it has not yet been used in common seawater due to the technique’s lower sensitivity. In this work, we present a highly sensitive underwater in situ Raman spectroscopy system for dissolved gas detection in common seawater. Considering the difficulty of underwater degassing and in situ detection, we designed a near-concentric cavity to improve the sensitivity, with a miniature gas sample chamber featuring an inner volume of 1 mL placed inside the cavity to reach equilibrium in a short period of time. According to the 3σ criteria, the detection limits of this system for CO2, O2, and H2 were calculated to be 72.8, 44.0, and 27.7 ppm, respectively. Using a hollow fiber membrane degasser with a large surface area, the CO2 signal was found to be clearly visible in 30 s at a flow rate of 550 mL/min. Moreover, we deployed the system in Qingdao’s offshore seawater, and the field test showed that this system is capable of successfully detecting in situ the multiple gases dissolved in the seawater simultaneously.

Trace gas detection of molecular hydrogen H2 by photoacoustic stimulated Raman spectroscopy (PARS)

The Analyst ◽  
2012 ◽  
Vol 137 (6) ◽  
pp. 1384 ◽  
Author(s):  
Claire Louise Spencer ◽  
Verity Watson ◽  
Michael Hippler
Keyword(s):  
Raman Spectroscopy ◽  
Molecular Hydrogen ◽  
Gas Detection ◽  
Trace Gas ◽  
Trace Gas Detection ◽  
Stimulated Raman

scholarly journals High-Sensitivity Raman Gas Probe for In Situ Multi-Component Gas Detection

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3539
Author(s):  
Jinjia Guo ◽  
Zhao Luo ◽  
Qingsheng Liu ◽  
Dewang Yang ◽  
Hui Dong ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Optical Fibers ◽  
Signal Transmission ◽  
High Sensitivity ◽  
Multiple Reflection ◽  
Detection Sensitivity ◽  
Gas Detection ◽  
In Situ Detection ◽  
Lower Background

Multiple reflection has been proven to be an effective method to enhance the gas detection sensitivity of Raman spectroscopy, while Raman gas probes based on the multiple reflection principle have been rarely reported on. In this paper, a multi-reflection, cavity enhanced Raman spectroscopy (CERS) probe was developed and used for in situ multi-component gas detection. Owing to signal transmission through optical fibers and the miniaturization of multi-reflection cavity, the CERS probe exhibited the advantages of in situ detection and higher detection sensitivity. Compared with the conventional, backscattering Raman layout, the CERS probe showed a better performance for the detection of weak signals with a relatively lower background. According to the 3σ criteria, the detection limits of this CERS probe for methane, hydrogen, carbon dioxide and water vapor are calculated to be 44.5 ppm, 192.9 ppm, 317.5 ppm and 0.67%, respectively. The results presented the development of this CERS probe as having great potential to provide a new method for industrial, multi-component online gas detection.

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