The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A multilayer structure of TeO2/interdigital transducers (IDTs)/ZnO(112¯0)/Si(100) was proposed and investigated to achieve both high sensitivity and temperature-stability for bio-sensing applications. Dispersions of phase velocities, electromechanical coupling coefficients K2, temperature coefficient of delay (TCD) and sensitivity in the multilayer structures were simulated as functions of normalized...
This paper has analyzed the relationship between the distribution of displacement vectors and the properties of corresponding line defect waveguide within the band gaps of PCs. In order to obtain the band gaps of PCs, a delay line model was built. Through simulating this model by finite element method, the displacement vectors in PCs also can be obtained. To analyze the properties of corresponding...
As a new structure, reflecting gratings based on two-dimensional (2-D) piezoelectric phononic crystals (PCs) have been studied for several years. This paper has proposed an approach to analyze the reflectivity of this reflecting grating in two directions. In the method, resonant modal was firstly analyzed with three-dimensional (3-D) finite element method (FEM) using the commercial software COMSOL...
A three-dimensional (3D) finite element method (FEM) model was proposed to analyze the resonant modal of the transducers based on two-dimensional (2D) phononic crystals (PnCs). Using this model two modals existed with symmetric modal and anti-symmetric modal can be extracted, and then reflectivity of the transducers was derived. An example of transducer based on 2D PnCs composed of IDTs of aluminum...
This paper aimed to study the pressure sensitive coefficients of different cuts of quartz for the surface acoustic wave(SAW) pressure sensors with non-uniform pressure load, and tried to find the most sensitive cut. The finite element analysis/ perturbation theory combines model was constructed to calculate the pressure sensitive coefficients. For analysis of different cut angles (0, θ, φ) of quartz...
A surface acoustic wave (SAW)-based sensor coated with SnO2 thin layer is investigated for H2S sensing. The conventional semiconductor sensor usually works in higher temperature (>;150°C) by resistance effect and performs with low sensitivity (>;10ppm). Compared with conventional semiconductor sensor, the SAW-based sensor is affected not only by conductivity but also by mass loading. Both of...
Highway airstrips construct the airport net with stock airports and standby airports as assistant, and the icing condition of airstrip surface need be monitored. Surface acoustic wave(SAW) ice sensor is in small size and can wireless passive measure, potential in highway airstrip ice monitoring application. Based on Zimmermann's theory, the impacts of guiding layer thickness on phase velocity was...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.