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 [1]. For ethene (C2H4) buffered in synthetic air a minimum detection limit of 70 pptV (70×10-12 per volume) is achieved with a line-tunable CO2-laser as pump source corresponding to a minimum measurable absorption coefficient αmin = 2×10-9cm-1 for a signalto-noise ratio of 3. The multicomponent capability of the system is demonstrated with continuous sequential measurements of gases such as ethene, methanol, and ethanol of air from a fruit storage chamber as shown in Fig. 1.
© 2000 IEEE
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