Overtone resonance enhanced single-tube on-beam quartz enhanced photoacoustic spectrophone | Zendy

Huadan Zheng | Zendy; Lei Dong | Zendy; Angelo Sampaolo | Zendy; Pietro Patimisco | Zendy; Weiguang Ma | Zendy; Lei Zhang | Zendy; Wangbao Yin | Zendy; Liantuan Xiao | Zendy; Vincenzo Spagnolo | Zendy; Suotang Jia | Zendy; Frank K. Tittel | Zendy

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Overtone resonance enhanced single-tube on-beam quartz enhanced photoacoustic spectrophone

Author(s) -

Huadan Zheng,

Lei Dong,

Angelo Sampaolo,

Pietro Patimisco,

Weiguang Ma,

Lei Zhang,

Wangbao Yin,

Liantuan Xiao,

Vincenzo Spagnolo,

Suotang Jia,

Frank K. Tittel

Publication year - 2016

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4962810

Subject(s) - overtone , resonance (particle physics) , resonator , beam (structure) , signal (programming language) , photoacoustic spectroscopy , optics , materials science , chemistry , physics , laser , atomic physics , spectral line , computer science , astronomy , programming language

A single-tube on-beam quartz enhanced photoacoustic spectroscopy (SO-QEPAS) spectrophone, which employs a custom-made quartz tuning fork (QTF) having a prong spacing of 700 μm and operating at the 1st overtone flexural mode, is reported. The design of QTF prong geometry allows the bare QTF to possess twice higher Q-factor values for the 1st overtone resonance mode falling at ∼17.7 kHz than in the fundamental resonance mode at ∼2.8 kHz, resulting in an 8 times higher QEPAS signal amplitude when operating in the 1st overtone resonance mode. Both the vertical position and length of the single-tube acoustic micro-resonator (AmR) were optimized to attain optimal spectrophone performance. Benefiting from the high overtone resonance frequency and the quasi 1st harmonic acoustic standing waves generated in the SO-QEPAS configuration, the AmR length is reduced to 14.5 mm. This allows the realization of compact spectrophone and facilitates the laser beam alignment through the QTF + AmR system. The signal enhancement in the overtone resonance mode and the high acoustic coupling efficiency between the AmR and QTF in the SO-QEPAS configuration yields an overall sensitivity enhancement factor of ∼380 with respect to the bare custom QTF operating in the fundamental resonance mode

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