Trace-gas sensing in the 3.3-μm region using a diode-based difference-frequency laser photoacoustic system
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- Fischer, C. & Sigrist, M. Appl Phys B (2002) 75: 305. doi:10.1007/s00340-002-0982-9
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A compact, diode-based difference-frequency laser system combined with a photoacoustic detection scheme is presented for trace-gas sensing. It features a broad, continuous tuning range (3.2–3.7 μm), a narrow line width (154 MHz), and room-temperature operation, and thus allows numerous gas species to be measured both isolated and in mixtures of different gases. Several trace-gas species of environmental interest were detected, and gas mixtures were analysed. The detection limits are in the low-ppmV range, e.g. 1.3 ppmV for methane, 1.8 ppmV for ethane, and 1.2 ppmV for hydrogen chloride.