Tuning forks with optimized geometries for quartz-enhanced photoacoustic spectroscopy
| Autor: | Stefano Dello Russo, Pietro Patimisco, Vincenzo Spagnolo, Angelo Sampaolo, Verena Mackowiak, Alex Cable, Frank K. Tittel, Hubert Rossmadl, Marilena Giglio |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Atmospheric pressure business.industry Gas Sensing Gas Sensing Quartz tuning forks 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics Optics Quality (physics) Electrical resistance and conductance Flexural strength law Attenuation coefficient 0103 physical sciences Quartz tuning forks Tuning fork 0210 nano-technology business Photoacoustic spectroscopy Quartz |
| Zdroj: | Optics express. 27(2) |
| ISSN: | 1094-4087 |
| Popis: | We report on the design, realization, and performance of novel quartz tuning forks (QTFs) optimized for quartz-enhanced photoacoustic spectroscopy (QEPAS). Starting from a QTF geometry designed to provide a fundamental flexural in-plane vibrational mode resonance frequency of ~16 kHz, with a quality factor of 15,000 at atmospheric pressure, two novel geometries have been realized: a QTF with T-shaped prongs and a QTF with prongs having rectangular grooves carved on both surface sides. The QTF with grooves showed the lowest electrical resistance, while the T-shaped prongs QTF provided the best photoacoustic response in terms of signal-to-noise ratio (SNR). When acoustically coupled with a pair of micro-resonator tubes, the T-shaped QTF provides a SNR enhancement of a factor of 60 with respect to the bare QTF, which represents a record value for mid-infrared QEPAS sensing. |
| Databáze: | OpenAIRE |
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