Detection of traces of H2S 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 H2S near λ = 1580 nm and a sensitivity of 4 ppm·m for the 1577.32 nm component of the ν1+ν2+ν3 band is achieved. This result improves the optical detection limit of H2S in air by one order of magnitude. Self- and air-broadening coefficients at 25°C are determined with direct absorption spectroscopy.
Detection of H2S at the ppm level using a telecommunication diode laser / G Modugno;C Corsi;M Gabrysch;M Inguscio. - In: OPTICS COMMUNICATIONS. - ISSN 0030-4018. - STAMPA. - 145:(1998), pp. 76-80. [10.1016/S0030-4018(97)00461-6]
Detection of H2S at the ppm level using a telecommunication diode laser
MODUGNO, GIOVANNI;INGUSCIO, MASSIMO
1998
Abstract
Detection of traces of H2S 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 H2S near λ = 1580 nm and a sensitivity of 4 ppm·m for the 1577.32 nm component of the ν1+ν2+ν3 band is achieved. This result improves the optical detection limit of H2S 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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