Wojtas, JacekGluszek, AleksanderHudzikowski, ArkadiuszTittel, Frank K.2017-03-072017-03-072017Wojtas, Jacek, Gluszek, Aleksander, Hudzikowski, Arkadiusz, et al.. "Mid-Infrared Trace Gas Sensor Technology Based on Intracavity Quartz-Enhanced Photoacoustic Spectroscopy." <i>Sensors,</i> 17, no. 3 (2017) MDPI: http://dx.doi.org/10.3390/s17030513.https://hdl.handle.net/1911/94032The application of compact inexpensive trace gas sensor technology to a mid-infrared nitric oxide (NO) detectoion using intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) is reported. A minimum detection limit of 4.8 ppbv within a 30 ms integration time was demonstrated by using a room-temperature, continuous-wave, distributed-feedback quantum cascade laser (QCL) emitting at 5.263 µm (1900.08 cm−1) and a new compact design of a high-finesse bow-tie optical cavity with an integrated resonant quartz tuning fork (QTF). The optimum configuration of the bow-tie cavity was simulated using custom software. Measurements were performed with a wavelength modulation scheme (WM) using a 2f detection procedure.engThis is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Journal articlelaser absorption spectroscopybow-tie cavityI-QEPASintracavity quartz-enhanced photoacoustic spectroscopymid-infrared trace gas sensorshttp://dx.doi.org/10.3390/s17030513