{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T11:57:46Z","timestamp":1777982266771,"version":"3.51.4"},"reference-count":36,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2023,4,11]],"date-time":"2023-04-11T00:00:00Z","timestamp":1681171200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the National High Technology Research and Development Program of China","award":["2021YFB3201904"],"award-info":[{"award-number":["2021YFB3201904"]}]},{"name":"the National High Technology Research and Development Program of China","award":["11874363"],"award-info":[{"award-number":["11874363"]}]},{"name":"the National High Technology Research and Development Program of China","award":["41877311"],"award-info":[{"award-number":["41877311"]}]},{"name":"the National High Technology Research and Development Program of China","award":["42005107"],"award-info":[{"award-number":["42005107"]}]},{"name":"the National High Technology Research and Development Program of China","award":["YZJJ2020QN8"],"award-info":[{"award-number":["YZJJ2020QN8"]}]},{"name":"the National Natural Science Foundation of China","award":["2021YFB3201904"],"award-info":[{"award-number":["2021YFB3201904"]}]},{"name":"the National Natural Science Foundation of China","award":["11874363"],"award-info":[{"award-number":["11874363"]}]},{"name":"the National Natural Science Foundation of China","award":["41877311"],"award-info":[{"award-number":["41877311"]}]},{"name":"the National Natural Science Foundation of China","award":["42005107"],"award-info":[{"award-number":["42005107"]}]},{"name":"the National Natural Science Foundation of China","award":["YZJJ2020QN8"],"award-info":[{"award-number":["YZJJ2020QN8"]}]},{"name":"the \u201cSpark\u201d Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences","award":["2021YFB3201904"],"award-info":[{"award-number":["2021YFB3201904"]}]},{"name":"the \u201cSpark\u201d Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences","award":["11874363"],"award-info":[{"award-number":["11874363"]}]},{"name":"the \u201cSpark\u201d Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences","award":["41877311"],"award-info":[{"award-number":["41877311"]}]},{"name":"the \u201cSpark\u201d Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences","award":["42005107"],"award-info":[{"award-number":["42005107"]}]},{"name":"the \u201cSpark\u201d Fund Project of Hefei Institutes of Physics Science, Chinese Academy Sciences","award":["YZJJ2020QN8"],"award-info":[{"award-number":["YZJJ2020QN8"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this study, a method for double-beam quantum cascade laser absorption spectroscopy (DB-QCLAS) was developed. Two mid-infrared distributed feedback quantum cascade laser beams were coupled in an optical cavity for the monitoring of NO and NO2 (NO at 5.26 \u03bcm; NO2 at 6.13 \u03bcm). Appropriate lines in the absorption spectra were selected, and the influence of common gases in the atmosphere, such as H2O and CO2, was avoided. By analyzing the spectral lines under different pressure conditions, the appropriate measurement pressure of 111 mbar was selected. Under this pressure, the interference between adjacent spectral lines could be effectively distinguished. The experimental results show that the standard deviations for NO and NO2 were 1.57 ppm and 2.67 ppm, respectively. Moreover, in order to improve the feasibility of this technology for detecting chemical reactions between NO and O2, the standard gases of NO and O2 were used to fill the cavity. A chemical reaction instantaneously began, and the concentrations of the two gases were immediately changed. Through this experiment, we hope to develop new ideas for the accurate and rapid analysis of the process of NOx conversion and to lay a foundation for a deeper understanding of the chemical changes in atmospheric environments.<\/jats:p>","DOI":"10.3390\/s23083885","type":"journal-article","created":{"date-parts":[[2023,4,12]],"date-time":"2023-04-12T02:08:11Z","timestamp":1681265291000},"page":"3885","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Development of a Rapid Measurement Method for Analysis of the NOx Conversion Process Based on Quantum Cascade Laser Absorption Spectroscopy"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-3174-6011","authenticated-orcid":false,"given":"Xi","family":"Yang","sequence":"first","affiliation":[{"name":"School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China"},{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhirong","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China"},{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"},{"name":"Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"},{"name":"Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuang","family":"Yang","sequence":"additional","affiliation":[{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pengshuai","family":"Sun","sequence":"additional","affiliation":[{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bian","family":"Wu","sequence":"additional","affiliation":[{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hua","family":"Xia","sequence":"additional","affiliation":[{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Runqing","family":"Yu","sequence":"additional","affiliation":[{"name":"School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China"},{"name":"Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,4,11]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"35912","DOI":"10.1038\/srep35912","article-title":"Satellite NO2 Retrievals Suggest China Has Exceeded Its NOx Reduction Goals from the Twelfth Five-Year Plan","volume":"6","author":"Lu","year":"2016","journal-title":"Sci. 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