Surface Acoustic Wave Devices
Mostrando 1-7 de 7 artigos, teses e dissertações.
-
1. Tin and zinc oxides semiconductor devices / Dispositivos semicondutores a partir de óxidos de estanho e zinco
This work presents the study and development of semiconductor devices base on tin and zinc oxides. The first device is related to the development of pH sensors based on field effect, while the second device uses surface acoustic waves for the transport of carriers related to a single photon detector device. Initially, the semiconductors were used as hydrogen
Publicado em: 2009
-
2. Estudo das propriedades acusticas do filme finode TiO2 usando SAW / Study of acoustic properties of TiO2 films with help of surface acoustic wave resonators
This thesis presents the study and design of the elements which compose a gas sensor based on Surface Acoustic Wave technology, such as, SAW Colpitts oscillator and the SAW one-port resonator that are presents in the feedback loop of an amplifier. It was done deposition of TiO2 thin film different thickness on the sensor, in order to study the effect of SAW
Publicado em: 2005
-
3. Compact SPICE model for devices and sensors based on surface acoustic wave / Modelo SPICE compacto para dispositivos e sensores a onda acÃstica de superfÃcie
O desenvolvimento atual em sensores tem como objetivo, uma maior integraÃÃo entre o componente sensÃvel e o circuito eletrÃnico para detecÃÃo, processamento e comunicaÃÃo, de maneira que todos os componentes sejam fabricados no mesmo chip. Esse tipo de sensor à denominado genericamente de sensor inteligente integrado (integrated smart sensor). A sua
Publicado em: 2002
-
4. Tecnologia de sementes para quartzo sintetico : aprimoramento da perfeição cristalina
The advanced industry of information technology has been utilizing a large amount of synthetic quartz for electronic devices, such as resonators, wave filters, oscillators, SA W (Surface Acoustic Waves) devices. One important condition for these applications is the high perfection of synthetic quartzo Therefore, the progress of this area is closely related w
Publicado em: 2000
-
5. Desenvolvimento de um filtro passa-faixas empregando tecnologia de ondas acusticas superficiais
The main objective of this work was to present the development of 70 MHz Bandpass filter, making use of Surface Acoustic Waves(SAW) technology. Some devices have been constructed in order to be used in the system to transmite TV signal by Fiberoptic, "TVFO". These devices were developed at the Brazilian Telecommunication Research an Development Centre (CPqDT
Publicado em: 1997
-
6. Surface acoustic wave propagation in Y- and Z-cut 0.67PbMgNbO3–0.33PbTiO3 single crystals
Surface acoustic wave (SAW) propogation in Y-cut and Z-cut relaxor-based 0.67Pb(Mg1∕3Nb2∕3)O3–0.33PbTiO3 (PMN-33%PT) ferroelectric single crystals poled along [001]c cubic direction has been analyzed theoretically. Characteristic curves were obtained for the phase velocity, electromechanical coupling coefficient and PFA of SAW in Y-cut and Z-cut PMN-33
American Institute of Physics.
-
7. Measurement of the spectral directivity of optoacoustic and ultrasonic transducers with a laser ultrasonic source
Comprehensive characterization of wideband ultrasonic transducers and specifically optoacoustic detectors is achieved through the analysis of their frequency response as a function of the incident angle. The tests are performed under well-defined, repeatable operating conditions. Backillumination of a blackened, acoustically matched planar surface with a sho
American Institute of Physics.