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In this letter, a quartz enhanced photoacoustic spectroscopy ( QEPAS based trace gas sensor using a quartz tuning fork QTF with resonant frequency of 40 kHz as the acoustic wave transducer was demonstrated for t he first time. A 1.395 μm continuous wave (CW), fiber coupled distributed feedback (DFB) diode laser was employed as the exciting source. Water vapor was selected as the target gas, and wavelength modulation spectroscopy (WMS) with 2nd harmonic detection was utilized. After optimization of the laser modulation depth, a minimum detection limit ( MDL of 139 ppmv was obtained.
Quartz-enhanced photoacoustic spectroscopy , Quartz tuning fork Resonant frequency Water vapor.
Y. F. MA, Y. HE, J. B. ZHANG, G. YU, X. YU, C. CHEN, R. SUN, J. W. ZHANG, Water vapor concentration detection based on QEPAS sensor, Optoelectronics and Advanced Materials - Rapid Communications, 10, 5-6, May-June 2016, pp.351-353 (2016).
Submitted at: Oct. 13, 2015
Accepted at: June 9, 2016