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1 February 2019 Octupole electrode pattern for tuning forks vibrating at the first overtone mode in quartz-enhanced photoacoustic spectroscopy
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Abstract
We report on a comparison between two quartz tuning forks (QTFs) employed for quartz-enhanced photoacoustic spectroscopy (QEPAS) having quadrupole and octupole electrode pattern configurations. With respect to the quadrupole, the implementation of the octupole pattern suppresses the fundamental mode and reduces by a factor of ~ 4.4 the electrical resistance for the first overtone mode with negligible variations of the related Q-factors. Both QTFs operating at the first overtone mode were implemented in a QEPAS sensor and the results showed that the octupole configuration provides a ~2.3 signal enhancement factor.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Elefante, P. Patimisco, A. Sampaolo, M. Giglio, G. Menduni, H. Rossmadl, V. Mackowiak, V. Passaro, Bruno Gross, Alex Cable, F. K. Tittel, and V. Spagnolo "Octupole electrode pattern for tuning forks vibrating at the first overtone mode in quartz-enhanced photoacoustic spectroscopy", Proc. SPIE 10926, Quantum Sensing and Nano Electronics and Photonics XVI, 109262K (1 February 2019); https://doi.org/10.1117/12.2507909
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