An all-optical off-beam quartz-enhanced photoacoustic spectroscopy employing double-pass acoustic microresonators
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NSTL
Elsevier
An all-optical off-beam quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor employing double-pass acoustic microresonators was proposed and experimentally investigated. An optical fiber Fabry-Perot interferometric sensor with quadrature point self-stabilization was employed for the detection of quartz prong vibration. A commercial quartz tuning fork with a resonant frequency of 30.72 kHz was employed as an acoustic transducer. Water vapor as the catalyst was added for improving the vibrational energy transfer. The minimum detection limit of similar to 2.41 ppmv was obtained with a 1 s averaging time, which corresponded to a normalized noise equivalent absorption coefficient of 7.76x10(-8) cm(-1) W Hz(-1/2) at the methane absorption line of 6046.95 cm(-1) with an optimized modulation depth of 0.172 cm(-1). The detection sensitivity was enhanced by a factor of similar to 1.48 in comparison to the off-beam QEPAS employing a single-pass microresonator. An Allan deviation analysis indicated that the ultimate detection limit for the QEPAS-based sensor was similar to 0.288 ppmv at the optimum averaging time of similar to 125 s.
Off-beam QEPASAll-opticalDouble-passQuadrature point self-stabilizationFabry-Perot interferometric sensor
Lin, Cheng、Yan, Xueyang、Huang, Yongchao
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Neijiang Normal Univ, Coll Phys & Elect Informat Engn, Neijiang 641100, Sichuan, Peoples R China
NSTL
Elsevier
