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Vol. 219, Issue 1, January 2018, pp. 34-43

 

Bullet

 

New Design for Stable and Robust Resonators, and Wireless Temperature SAW Sensors Based on the Use
of a Single SAW Resonator Taking Advantage of New Design Criteria
 

1, 2 Marianne Sagnard, 2 Thierry Laroche and 2 Sylvain Ballandras

1 Femto-ST - Time and frequency department, 2 Frecínísys SAS
E-mail: marianne.sagnard@frecnsys.fr, thierry.laroche@frecnsys.fr, sylvain.ballandras@frecnsys.fr

 

Received: 10 November 2017 /Accepted: 4 January 2018 /Published: 31 January 2018

Digital Sensors and Sensor Sysstems

 

Abstract: Surface acoustic wave (SAW) devices are often used to monitor environmental parameters such as temperature, pressure or stress for instance. In order to ensure the continuity of the frequency response versus these parameters - namely, to remove the effects of directivity, transducers working out of the Bragg conditions are studied. In other words, the electrical excitation of the transducer is no more the usual alternating of one electrode set at a given potential with another one connected to the ground. This solution can be used either to preserve the spectral purity of the device or, on the contrary to enhance the multimodal nature of the acoustic cavity. Actually this paper shows that it can be exploited to design monolithic temperature SAW sensors.

 

Keywords: Surface acoustic wave, SAW, Resonators, Sensors, Temperature, Bragg band, Directivity, Three strips per wavelength.

 

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