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- W2995171308 abstract "An auto-correction laser photoacoustic (PA) spectrometer based on 2f/1f wavelength modulation spectroscopy (WMS) has been proposed and demonstrated for trace gas detection to eliminate concentration measurement errors due to light power variations. A 1.53 μm distributed feedback (DFB) laser is used as a light source to excite the 2f PA signal that is generated by gas absorption. Meanwhile, a multilayer graphene sheet is employed as a highly efficient photothermal conversion unit for adding a 1f PA background signal, whose amplitude at the absorption center of the traditional PAS system is almost zero. The experimental results show that the gas concentration measured from the 2f/1f WMS signal is almost independent of the laser power. A detection limit of 416 ppb has been achieved for the 1 s measurement interval and could be further improved to 65 ppb with 100 s averaging, according to the Allan deviation analysis." @default.
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- W2995171308 date "2020-01-01" @default.
- W2995171308 modified "2023-10-02" @default.
- W2995171308 title "An auto-correction laser photoacoustic spectrometer based on 2<i>f</i>/1<i>f</i> wavelength modulation spectroscopy" @default.
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- W2995171308 doi "https://doi.org/10.1039/c9an01799b" @default.
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