We report on the development of a gas sensor system based on quartz-enhanced photoacoustic spectroscopy (QEPAS) for the detection of trace levels of ethylene using a quantum cascade laser operating at ~ 10.3 μm. To realize a compact sensor architecture, a dedicated acoustic detection module was designed and implemented. The module includes a QEPAS spectrophone, composed of a quartz tuning fork, a micro-resonator tube and a low-noise pre-amplifier chip for the signal readout. The volume of the ADM is ~30 cm3. A minimum detection limit of 30 part-per-billion in concentration was obtained with a data acquisition time of 10 s.
P. Patimisco, A. Sampaolo, M. Giglio, F. Sgobba, H. Rossmadl, V. Mackowiak, B. Gross, A. Cable, F. K. Tittel, and V. Spagnolo, "Compact and low-noise quartz-enhanced photoacoustic sensor for sub-ppm ethylene detection in atmosphere," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105401Q (Presented at SPIE OPTO: January 31, 2018; Published: 26 January 2018); https://doi.org/10.1117/12.2288368.
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