期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 119, 期 1, 页码 21-27出版社
SPRINGER
DOI: 10.1007/s00340-014-5991-y
关键词
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资金
- Italian Ministry of University and Research (MIUR) through the project Active Ageing at Home [CTN01_00128_297061]
- Regione Toscana within the frame of POR CReO FESR
- Project SIMPAS (Innovative Measurement Systems for the Protection of Environment and Health)
- Italian research projects [PON01 02238, PON02 00675, PON02 00576]
We report on the realization of a quartz-enhanced photoacoustic (QEPAS) sensor for measurement of H2S gas traces. A distributed feedback diode laser working at 2.64 A mu m wavelength has been coupled to an acoustic detection module composed of a quartz tuning fork and a micro-resonator system, and the QEPAS signal has been optimized in terms of gas sample pressure and laser frequency modulation depth. The sensor shows a very good linearity with respect to the H2S concentration. We performed an Allan-Werle variance analysis to investigate the sensor long-term stability, and we reached a detection limit of four parts per million for 1-s integration time and 500 parts per billion in 60-s integration time. The realized QEPAS sensor represents a good compromise between performance and handiness, in view of a fully portable device.
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