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• W4200398052 endingPage "120774" @default.
• W4200398052 startingPage "120774" @default.
• W4200398052 abstract "Quantitative gas measurement under the condition of unknown optical path length is a challenge in laser absorption spectroscopy technology field. In this paper, we proposed a tunable diode laser absorption spectroscopy line shape analysis (TDLAS-LSA) method for simultaneous measurement of water vapor concentration and effective optical path length (EOPL) under unknown optical path conditions. A single H2O absorption line near 1383.9 nm (7226.02 cm-1) was selected, and its line strength, self-broadening coefficient and temperature-dependence coefficient were measured experimentally to improve the HITRAN databases. The Lorentz broadening and line area were accurately extracted by Hartmann-Tran profile (HTP) fitting, and the gas concentration and EOPL were calculated based on the spectral line shape analysis method. Eight concentrations of water vapor in the range of 146 ppm ∼ 4.39% were measured experimentally, and the maximum average deviation between the TDLAS-LSA method and the commercial sensor was less than 7.1%. Comparing the EOPL with mechanical measurement, the maximum deviation of multiple measurements is less than 5.7%. The results showed that the TDLAS-LSA method can effectively perform gas sensing under unknown optical path conditions, and has great application potential in low-cost, in-situ and multi-parameter simultaneous measurement." @default.
• W4200398052 created "2021-12-31" @default.
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• W4200398052 date "2022-04-01" @default.
• W4200398052 modified "2023-09-28" @default.
• W4200398052 title "Simultaneous measurement of H2O concentration and effective absorption optical path length under unknown optical path length condition based on a single spectral line" @default.
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• W4200398052 doi "https://doi.org/10.1016/j.saa.2021.120774" @default.
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