Scientific Results

Quartz Crystal Resonator Sensor With Printed-on-Crystal Coil for Dual-Harmonic Electromagnetic Contactless Interrogation

Year: 2020

Authors: Bau M., Ferrari M., Ferrari V.

Autors Affiliation: ‎Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; CNR, Natl Inst Opt INO, I-25123 Brescia, Italy

Abstract: A novel quartz crystal resonator (QCR) sensor with a printed-on-crystal conductive coil, named sensor coil, is presented. The sensor coil electromagnetically coupled to an external readout coil allow to perform contactless interrogation of the QCR working as a stand-alone sensor unit. A frequency-domain readout technique is adopted that allows dual-harmonic operation by detecting the QCR frequencies of the fundamental and third harmonic, and offers first-order independence from the stand-off distance between the sensor and the readout unit. The QCR electrodes and sensor coil have been printed on a 330- ${\mu }\text{m}$ -thick bare AT-cut quartz crystal exploiting the aerosol jet printing technology. The fabricated QCR sensor has reference values of the fundamental and third harmonic frequencies at 4.77 and 14.22 MHz, respectively. Distance-independent contactless operation has been demonstrated for distances up to 12 mm. The readout frequencies deviate from reference values less than 10 and 90 ppm for the fundamental and third harmonic, respectively, thus validating the proposed principle.

Journal/Review: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL

Volume: 67 (4)      Pages from: 883  to: 886

KeyWords: Contactless interrogation; multiharmonic readout; quartz crystal resonator (QCR) sensor; wireless sensing
DOI: 10.1109/TUFFC.2019.2956814

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