论文信息 - Detection of H2S at the ppm level using a telecommunication diode laser

Detection of H2S at the ppm level using a telecommunication diode laser

Abstract Detection of traces of H 2 S in air at the ppm level using a Distributed-Feed-Back (DFB) semiconductor diode laser spectrometer is reported. Two-tone frequency modulation spectroscopy is employed to investigate overtone transitions of H 2 S near λ = 1580 nm and a sensitivity of 4 ppm·m for the 1577.32 nm component of the ν 1 + ν 2 + ν 3 band is achieved. This result improves the optical detection limit of H 2 S in air by one order of magnitude. Self- and air-broadening coefficients at 25°C are determined with direct absorption spectroscopy.

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