Abstract
We report on a compact, lightweight, and portable sensor for simultaneous detection of methane, nitrous oxide, and ammonia in atmosphere. The sensor embeds two detection modules based on quartz-enhanced photoacoustic spectroscopy, with two quantum cascade lasers as light sources and two spectrophones with custom-made quartz tuning forks. Dedicated electronic boards were designed to control the laser sources, to stabilize the gas flow and to perform data analysis, with a computer interface for an easy end-user operation. The sensor was calibrated in laboratory environment with certified concentrations. Detection limits well below the natural abundance in standard air were achieved.
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