A. Elia, V. Spagnolo, C. Di Franco, P. M. Lugarà, G. Scamarcio
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Photoacoustic trace gas sensing with mid-IR quantum cascade lasers
We report on the realization of an optoacoustic sensor based on mid-infrared quantum-cascade lasers (QCLs) for the detection of nitric oxide (NO) and formaldehyde (CH2O). A resonant photoacoustic cell equipped with 4 electret microphones was excited in its first longitudinal mode by the modulated laser light. A detection limit of 150 parts in 109 (ppbv) for NO and CH2O was found, using distributed feedback QCLs operating in pulsed mode at 5.34 µm and 5.62 µm, respectively.
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