Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers
We developed a cavity ringdown spectrometer by utilizing a step-scanning and dithering method for matching laser wavelengths to optical resonances of an optical cavity. Our approach is capable of working with two and more lasers for quasi-simultaneous measurements of multiple gas species. The develo...
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2021
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oai:doaj.org-article:fd9164a454704eddba8d7bd58e72113f2021-11-25T18:58:00ZQuasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers10.3390/s212276221424-8220https://doaj.org/article/fd9164a454704eddba8d7bd58e72113f2021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7622https://doaj.org/toc/1424-8220We developed a cavity ringdown spectrometer by utilizing a step-scanning and dithering method for matching laser wavelengths to optical resonances of an optical cavity. Our approach is capable of working with two and more lasers for quasi-simultaneous measurements of multiple gas species. The developed system was tested with two lasers operating around 1654 nm and 1658 nm for spectral detections of <sup>12</sup>CH<sub>4</sub> and its isotope <sup>13</sup>CH<sub>4</sub> in air, respectively. The ringdown time of the empty cavity was about 340 µs. The achieved high detection sensitivity of a noise-equivalent absorption coefficient was 2.8 × 10<sup>−11</sup> cm<sup>−1</sup> Hz<sup>−1/2</sup> or 1 × 10<sup>−11</sup> cm<sup>−1</sup> by averaging for 30 s. The uncertainty of the high precision determination of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi mathvariant="sans-serif">δ</mi><mn>13</mn></msup><msub><mi>CH</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula> in air is about 1.3‰. Such a system will be useful for future applications such as environmental monitoring.Guosheng MaYabai HeBing ChenHao DengYing LiuXingping WangZhihao ZhaoRuifeng KanMDPI AGarticlecavity ringdown spectroscopyoptical sensingsimultaneous detection of multi componentsmethane isotope ratioChemical technologyTP1-1185ENSensors, Vol 21, Iss 7622, p 7622 (2021) |
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cavity ringdown spectroscopy optical sensing simultaneous detection of multi components methane isotope ratio Chemical technology TP1-1185 |
| spellingShingle |
cavity ringdown spectroscopy optical sensing simultaneous detection of multi components methane isotope ratio Chemical technology TP1-1185 Guosheng Ma Yabai He Bing Chen Hao Deng Ying Liu Xingping Wang Zhihao Zhao Ruifeng Kan Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| description |
We developed a cavity ringdown spectrometer by utilizing a step-scanning and dithering method for matching laser wavelengths to optical resonances of an optical cavity. Our approach is capable of working with two and more lasers for quasi-simultaneous measurements of multiple gas species. The developed system was tested with two lasers operating around 1654 nm and 1658 nm for spectral detections of <sup>12</sup>CH<sub>4</sub> and its isotope <sup>13</sup>CH<sub>4</sub> in air, respectively. The ringdown time of the empty cavity was about 340 µs. The achieved high detection sensitivity of a noise-equivalent absorption coefficient was 2.8 × 10<sup>−11</sup> cm<sup>−1</sup> Hz<sup>−1/2</sup> or 1 × 10<sup>−11</sup> cm<sup>−1</sup> by averaging for 30 s. The uncertainty of the high precision determination of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msup><mi mathvariant="sans-serif">δ</mi><mn>13</mn></msup><msub><mi>CH</mi><mn>4</mn></msub></mrow></semantics></math></inline-formula> in air is about 1.3‰. Such a system will be useful for future applications such as environmental monitoring. |
| format |
article |
| author |
Guosheng Ma Yabai He Bing Chen Hao Deng Ying Liu Xingping Wang Zhihao Zhao Ruifeng Kan |
| author_facet |
Guosheng Ma Yabai He Bing Chen Hao Deng Ying Liu Xingping Wang Zhihao Zhao Ruifeng Kan |
| author_sort |
Guosheng Ma |
| title |
Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| title_short |
Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| title_full |
Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| title_fullStr |
Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| title_full_unstemmed |
Quasi-Simultaneous Sensitive Detection of Two Gas Species by Cavity-Ringdown Spectroscopy with Two Lasers |
| title_sort |
quasi-simultaneous sensitive detection of two gas species by cavity-ringdown spectroscopy with two lasers |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/fd9164a454704eddba8d7bd58e72113f |
| work_keys_str_mv |
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| _version_ |
1718410503481458688 |