Patimisco Pietro, Sampaolo Angelo, Giglio Marilena, Mackowiak Verena, Rossmadl Hubert, Gross Bruno, Cable Alex, Tittel Frank K, Spagnolo Vincenzo
Opt Lett. 2018 Apr 15;43(8):1854-1857. doi: 10.1364/OL.43.001854.
The design, realization, and performance analysis of an octupole electrode pattern configuration intended for the optimization of the charge collection efficiency in quartz tuning forks (QTFs) vibrating at the first overtone in-plane flexural mode is reported. Two QTFs having the same geometry, but differing in the electrode pattern deposited on the QTF prongs, have been realized in order to study the influence of the electrode pattern on the resonance quality factor and electrical resistance. A standard quadrupole pattern (optimized for the fundamental mode) and an octupole electrode layout have been implemented. Although both QTFs show the same resonance quality factor for the first overtone, the octupole pattern provides a reduction of the QTF electrical resistance by more than four times. The sensing performance of the two QTFs has been compared by employing them in a mid-IR quartz-enhanced photoacoustic sensor (QEPAS) system targeting a water absorption line. When operating at the first overtone mode, the QTF with an octupole electrode pattern provides a QEPAS signal more than two times higher with respect to the QTF employing the standard quadrupole configuration.
本文报道了一种八极电极图案配置的设计、实现及性能分析，该配置旨在优化在第一泛音面内弯曲模式下振动的石英音叉（QTF）的电荷收集效率。为了研究电极图案对共振品质因数和电阻的影响，制作了两个几何形状相同，但QTF叉指上沉积的电极图案不同的QTF。实现了一种标准四极图案（针对基模进行了优化）和一种八极电极布局。尽管两个QTF在第一泛音下显示出相同的共振品质因数，但八极图案使QTF的电阻降低了四倍多。通过将这两个QTF应用于针对水吸收线的中红外石英增强光声传感器（QEPAS）系统，比较了它们的传感性能。在第一泛音模式下工作时，具有八极电极图案的QTF提供的QEPAS信号比采用标准四极配置的QTF高出两倍多。
