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Copyright (c) 2023 Proceedings on Automation in Medical Engineering
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To meet the requirements for multispecies gas analysis in exhaled air, quartz-enhanced photoacoustic spectroscopy is used in combination with an IC-based laser system with an external resonator. The laser system enables coverage of a wavelength range of 280 nm with an output power of several mW. By integrating piezoelectric actuators as tuning elements, high sampling rates can be achieved. In this work, results are presented for the detection of the trace gases methane and ethane by sequential quasi-simultaneous measurements. The requirements of multispecies detection, tuning range, output power and detection rate are met by our work.