Abstract.
The development and application of a mobile laser-photoacoustic spectrometer for in situ multicomponent monitoring of trace gases in different environments is reported. Sub-ppbV (<10-9 per volume)-concentrations can be measured with a novel resonant multipass photoacoustic cell. The cell is designed for flow mode operation in order to reduce adsorption effects. For ethene (C2H4) buffered in synthetic air a minimum detection limit of 70 ppt V (70×10-12 per volume) is achieved corresponding to a minimum measurable absorption coefficient αmin=2×10-9 cm-1 for a signal-to-noise ratio of 3. The multicomponent capability of the system is demonstrated with continuous sequential measurements of ethene, methanol, ethanol, CO2, and H2O of air from a fruit storage chamber.
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Received: 23 November 1999 / Published online: 19 April 2000
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Nägele, M., Sigrist, M. Mobile laser spectrometer with novel resonant multipass photoacoustic cell for trace-gas sensing . Appl Phys B 70, 895–901 (2000). https://doi.org/10.1007/PL00021151
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DOI: https://doi.org/10.1007/PL00021151