This paper describes a high quality thin film piezoelectric aluminium nitride technology developed for applications in bulk acoustic wave resonators and filters. The fabrication of both SMR and FBAR resonators is described, and the main characteristics of these devices are reviewed.

A passive surface acoustic wave (SAW) pressure sensor was developed for real-time pressure monitoring in downhole application. The passive pressure sensor consists of a SAW resonator, which is attached to a circular metal diaphragm used as a pressure transducer. While the membrane deflects as a function of pressure applied, the frequency response changes due to the variation of the SAW propagat...

The present study originated in the lack of research into achieving underwater total internal reflection (TIR) via the acousto-optic effect. The uniqueness of this technique exists in the fact that it is based on a high sound pressure level which induces a localised change in refractive index of seawater sufficient to achieve total internal reflection within the communication channel. Different...

Acoustic waves based MEMS devices offer a promising technology platform for a wide range of applications due to their high sensitivity and the capability to operate wirelessly. These devices utilize an acoustic wave propagating through or on the surface of a piezoelectric material, as its sensing mechanism. Any variations to the characteristics of the propagation path affect the velocity or amp...

This review presents a deep insight into the Surface Generated Acoustic Wave (SGAW) technology for biosensing applications, based on more than 40 years of technological and scientific developments. In the last 20 years, SGAWs have been attracting the attention of the biochemical scientific community, due to the fact that some of these devices - Shear Horizontal Surface Acoustic Wave (SH-SAW), S...

The variation of accommodation space in faulted basin is mainly affected by three factors: the differential subsidence of basement, the deposition of sediments and the variation of absolute lake level. In this article, the variation laws of accommodation space have been analyzed and its distribution characteristics have been explained when the lake level is descending, still and ascending and t...

We describe the evolution of climate system dynamics by examining the climate response to changes in obliquity and precession over the last 5.3Myr. In particular, we examine changes in the shape of glacial cycles and the power of obliquity and precession response in benthic dO. When the exponential trend in dO variance is removed, its spectral power exhibits strong, proportional responses to am...