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Quartz tuning fork-based demodulation of an acoustic signal induced by photo-thermo-elastic energy conversion
Photoacoustics ( IF 7.9 ) Pub Date : 2021-05-15 , DOI: 10.1016/j.pacs.2021.100272
Ziting Lang , Shunda Qiao , Ying He , Yufei Ma

A gas sensing method based on quartz-enhanced photothermal spectroscopy (QEPTS) demodulated by quartz tuning fork (QTF) sensing acoustic wave is reported for the first time. Different from traditional QEPTS, the method proposed in this paper utilizes the second QTF to sense acoustic wave produced by the first QTF owing to the vibration resulted from photo-thermo-elastic effect. This indirect demodulation by acoustic wave sensing can avoid QTF being irradiated by laser beam and therefore get less noise and realize better detection sensitivity. Four different sensing configurations are designed and verified. Acetylene (C2H2) with a volume concentration of 1.95 % is selected as the target gas. A model of sound field produced by the first QTF vibrating is established by finite element method to explain the variation trend of signal and noise in the second QTF. The measured results indicate that this technique had an enhanced signal-to-noise ratio (SNR) of 1.36 times when compared to the traditional QEPTS. Further improvement methods for such technique is proposed.



中文翻译:

基于石英音叉的光热弹性能量转换所引起的声信号解调

首次报道了一种基于石英增强光热光谱法(QEPTS)的气体传感方法,该方法通过石英音叉(QTF)感测声波进行解调。与传统的QEPTS不同,本文提出的方法利用第二QTF来感知由于光热弹效应引起的振动而产生的第一QTF产生的声波。通过声波感测的这种间接解调可以避免QTF被激光束照射,从而获得更少的噪声并实现更好的检测灵敏度。设计并验证了四种不同的传感配置。乙炔(C 2 H 2选择体积浓度为1.95%的气体作为目标气体。通过有限元方法建立了第一个QTF振动产生的声场模型,以解释第二个QTF中信号和噪声的变化趋势。测量结果表明,与传统QEPTS相比,该技术的信噪比(SNR)增强了1.36倍。针对这种技术提出了进一步的改进方法。

更新日期:2021-05-19
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