The PolySense team has just published a new article on Photoacoustics Journal Elsevier (IF 7.9) reporting on a quartz enhanced photoacoustic spectroscopy (QEPAS) gas sensor designed for monitoring of ammonia (NH3) at ppb-level concentrations. The sensor is based on a novel custom quartz tuning fork (QTF) with a mid-infrared quantum cascade laser emitting at 9.55 μm. With 80-mW optical power and 300-ms lock-in integration time, the detection limit is achieved to be 2.2 ppb which is the best value reported in the literature so far for NH3 QEPAS sensors. A five-day continuous monitoring for atmospheric NH3 is performed, verifying the stability and robustness of the presented QEPAS-based NH3 sensor.
The following link provides access to the article: