Haiyue Sun,Xiaorong Sun,Ying He,Shunda Qiao,Yufei Ma
{"title":"High-Sensitivity TDLAS Sensors Based on Double-Helix United/Split Spot Patterns.","authors":"Haiyue Sun,Xiaorong Sun,Ying He,Shunda Qiao,Yufei Ma","doi":"10.1021/acs.analchem.5c03159","DOIUrl":null,"url":null,"abstract":"This paper presents a highly sensitive tunable diode laser absorption spectroscopy (TDLAS) sensor based on a double-helix united/split spot pattern. A dense double-helix united spot pattern was designed based on a three-mirror multipass cell (MPC) to obtain high detection sensitivity in a compact structure. The corresponding minimum detection limit (MDL) for methane (CH4) detection was enhanced to be 122.9 ppb. When the integration time was extended to 200 s, the MDL was reduced to 15.4 ppb. An example of a CH4 measurement application in urban environmental monitoring was presented in this research. A double-helix split spot pattern was designed to realize a real-time simultaneous dual-component TDLAS sensor. In the simultaneous and continuous monitoring of CH4 and acetylene (C2H2), a highly sensitive linear relationship with the concentration was successfully obtained. Corresponding MDLs for the CH4/C2H2 detection were calculated to be 354.7 and 111.2 ppb, respectively. When the integration time was set to 100 s, the corresponding MDLs were enhanced to 35.7 and 19.5 ppb, respectively.","PeriodicalId":27,"journal":{"name":"Analytical Chemistry","volume":"35 1","pages":""},"PeriodicalIF":6.7000,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Analytical Chemistry","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acs.analchem.5c03159","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
This paper presents a highly sensitive tunable diode laser absorption spectroscopy (TDLAS) sensor based on a double-helix united/split spot pattern. A dense double-helix united spot pattern was designed based on a three-mirror multipass cell (MPC) to obtain high detection sensitivity in a compact structure. The corresponding minimum detection limit (MDL) for methane (CH4) detection was enhanced to be 122.9 ppb. When the integration time was extended to 200 s, the MDL was reduced to 15.4 ppb. An example of a CH4 measurement application in urban environmental monitoring was presented in this research. A double-helix split spot pattern was designed to realize a real-time simultaneous dual-component TDLAS sensor. In the simultaneous and continuous monitoring of CH4 and acetylene (C2H2), a highly sensitive linear relationship with the concentration was successfully obtained. Corresponding MDLs for the CH4/C2H2 detection were calculated to be 354.7 and 111.2 ppb, respectively. When the integration time was set to 100 s, the corresponding MDLs were enhanced to 35.7 and 19.5 ppb, respectively.
期刊介绍:
Analytical Chemistry, a peer-reviewed research journal, focuses on disseminating new and original knowledge across all branches of analytical chemistry. Fundamental articles may explore general principles of chemical measurement science and need not directly address existing or potential analytical methodology. They can be entirely theoretical or report experimental results. Contributions may cover various phases of analytical operations, including sampling, bioanalysis, electrochemistry, mass spectrometry, microscale and nanoscale systems, environmental analysis, separations, spectroscopy, chemical reactions and selectivity, instrumentation, imaging, surface analysis, and data processing. Papers discussing known analytical methods should present a significant, original application of the method, a notable improvement, or results on an important analyte.