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• W4387004552 startingPage "123453" @default.
• W4387004552 abstract "A near-infrared (NIR) dual-gas sensor has been developed for simultaneous detection of atmospheric trace methane (CH4) and carbon dioxide (CO2). To realize high sensitivity and high precision, wavelength modulation spectroscopy with 2f/1f (WMS-2f/1f) detection method was adopted for eliminating laser light intensity fluctuation, and laser wavelength locking strategy based on a self-developed proportion integration differentiation (PID) algorithm was used for suppressing laser wavelength shifting effect. Two fiber-coupled DFB diode lasers with central wavelengths near 1653.7 nm and 1579.6 nm are applied for simultaneously measuring CH4 and CO2 spectra, respectively, and frequency division multiplexing (FDM) technique is employed to resolve the potential crosstalk effect. Real-time measurement of ambient atmospheric trace CH4 and CO2 was performed to demonstrate the long-term stability of the sensor system. Allan deviation analysis indicates that detection sensitivity of 0.1 ppm for CH4 and 2.27 ppm for CO2 was achieved with a 1 s average time, which can be further improved to 18 ppb and 0.3 ppm with the optimal integration time of 462 s and 392 s, respectively." @default.
• W4387004552 created "2023-09-26" @default.
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• W4387004552 date "2024-01-01" @default.
• W4387004552 modified "2023-10-11" @default.
• W4387004552 title "Frequency division multiplexing and wavelength stabilized 2f/1f wavelength modulation spectroscopy for simultaneous trace CH4 and CO2 detection" @default.
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• W4387004552 doi "https://doi.org/10.1016/j.saa.2023.123453" @default.
• W4387004552 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37804704" @default.
• W4387004552 hasPublicationYear "2024" @default.
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