We report on a comparison between piezoelectric and interferometric readouts of vibrations in quartz tuning forks (QTFs) when acting as sound wave transducers in a quartz-enhanced photoacoustic setup (QEPAS) for trace gas detection. A theoretical model relating the prong vibration amplitude with the QTF prong sizes and electrical resistance is proposed. To compare interferometric and piezoelectric readouts, two QTFs have been selected; a tuning fork with rectangular-shape of the prongs, having a resonance frequency of 3.4 kHz and a quality-factor of 4,000, and a QTF with prong having a T-shape characterized by a resonance frequency of 12.4 kHz with a quality-factor of 15,000. Comparison between the interferometric and piezoelectric readouts were performed by using both QTFs in a QEPAS sensor setup for water vapor detection. We demonstrated that the QTF geometry can be properly designed to enhance the signal from a specific readout mode.

我们报告了在石英音叉（QEPAS）中用作声波换能器以进行微量气体检测时，在石英音叉（QTF）中的振动的压电和干涉式读数之间的比较。提出了一种将爪振动幅度与QTF爪尺寸和电阻相关的理论模型。为了比较干涉式和压电式读数，选择了两个QTF。音叉为矩形的音叉，共振频率为3.4 kHz，品质因数为4,000，QTF音叉为T形，其共振频率为12.4 kHz，品质因数为15,000 通过在用于水蒸气检测的QEPAS传感器设置中同时使用两个QTF，可以比较干涉式和压电式读数。