Research on the displacement function and equivalent circuit of circular flexural vibration mode piezoelectric ceramic composite transducers

2013 ◽  
Vol 60 (1) ◽  
pp. 218-234 ◽  
Author(s):  
Huang Yihua ◽  
Huang Wenjin
Keyword(s):  
Equivalent Circuit ◽  
Piezoelectric Ceramic ◽  
Ceramic Composite ◽  
Vibration Mode ◽  
Flexural Vibration ◽  
Displacement Function

Piezoelectric-Ceramic Cylinder Type Vibratory Gyroscope

1994 ◽  
Vol 360 ◽  
Author(s):  
T. Yoshida
Keyword(s):  
Equivalent Circuit ◽  
Optimum Design ◽  
Cylindrical Surface ◽  
Piezoelectric Ceramic ◽  
Vibration Mode ◽  
Cylinder Surface ◽  
Vibratory Gyroscope ◽  
Interdigital Electrodes ◽  
Adhesion Process ◽  
Ceramic Cylinder

AbstractA new equivalent circuit for the vibratory gyroscope and an analyzing and controlling method for the vibration mode axis of the vibrator have been studied. The vibrator of this gyroscope consists of a piezoelectric-ceramic cylinder. On its outer cylindrical surface, interdigital electrodes are formed. And these electrodes are used for poling, AC excitation as well as detection. In order to prevent some deviation of the performance of the gyroscope due to the adhesion process, these electrodes are directly printed on the cylinder surface.By changing the electrodes pattern and making a groove on the surface of the vibrator, the vibration mode axis can be easily controlled. Optimum design suited for demanded specifications can then be obtained.

Coupled longitudinal-flexural vibration characteristics of a piezoelectric structure with losses

2021 ◽  
pp. 1045389X2110069
Author(s):  
Hua Yang ◽  
Tao Yuan ◽  
Hui Guo ◽  
Pei Sun ◽  
Pingqing Fan ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Equivalent Circuit ◽  
Vibration Mode ◽  
Flexural Vibration ◽  
Vibration Modes ◽  
Flexural Mode ◽  
Piezoelectric Structure ◽  
Beam Type ◽  
Piezoelectric Structures ◽  
Good Agreement

The dynamic characteristics studies of piezoelectric structures usually focus on the single vibration modes such as the longitudinal or the flexural mode, and the losses that cause heat generation and energy waste are generally neglected, which leads to discrepancies compared with experiments. In the present paper, a beam-type piezoelectric structure with four kinds of losses under coupled longitudinal-flexural vibration mode is investigated. In this approach, first, impedance matrix of the structure is obtained based on the motion equation and the electrical-mechanical boundary conditions. Secondly, admittance curves of this piezoelectric structure under different boundary conditions are simulated by the equivalent circuit methods that contain four losses—piezoelectric and dielectric losses, as well as two elastic losses. The simulation results by equivalent circuit methods has good agreement with COMSOL results, which demonstrate the effectiveness of the proposed method.

Investigation of Mass Sensitivity for the Piezoelectric Diaphragm Biosensor

2011 ◽  
Vol 411 ◽  
pp. 245-249
Author(s):  
Shao Kang Li ◽  
Wei Ren ◽  
Xiao Feng Chen ◽  
Xi Yao
Keyword(s):  
Software Package ◽  
Material Parameter ◽  
Analytic Solution ◽  
Vibration Mode ◽  
Structural Parameters ◽  
Flexural Vibration ◽  
Mass Sensitivity ◽  
Rayleigh Method ◽  
Acoustic Wave Device ◽  
Wave Device

The mass sensitivity of a piezoelectric diaphragm biosensor has been investigated. The piezoelectric diaphragm utilizing a flexural vibration mode is an acoustic wave device which can be immobilized with a bio-molecular recognition layer on its surface. The mass sensitivity of the sensor was analyzed by the approximately theoretical and FEM methods, respectively. The sensitivity formula expressed by the structural parameters and the material parameter was educed for easy computing. The procedure utilizing Rayleigh method for the analytic solution of the sensitivity was introduced. The expression was verified by using a commercial FEM software package, ANSYS. The simulations are well consistent with the theory.

scholarly journals MEMS Ultrasound Transducers for Endoscopic Photoacoustic Imaging Applications

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 928 ◽  
Author(s):  
Haoran Wang ◽  
Yifei Ma ◽  
Hao Yang ◽  
Huabei Jiang ◽  
Yingtao Ding ◽  
...  
Keyword(s):  
Microelectromechanical Systems ◽  
Vibration Mode ◽  
Photoacoustic Imaging ◽  
Rapid Development ◽  
Flexural Vibration ◽  
Ultrasound Transducers ◽  
Optical Contrast ◽  
Future Directions ◽  
Potential Applications ◽  
Mems Technology

Photoacoustic imaging (PAI) is drawing extensive attention and gaining rapid development as an emerging biomedical imaging technology because of its high spatial resolution, large imaging depth, and rich optical contrast. PAI has great potential applications in endoscopy, but the progress of endoscopic PAI was hindered by the challenges of manufacturing and assembling miniature imaging components. Over the last decade, microelectromechanical systems (MEMS) technology has greatly facilitated the development of photoacoustic endoscopes and extended the realm of applicability of the PAI. As the key component of photoacoustic endoscopes, micromachined ultrasound transducers (MUTs), including piezoelectric MUTs (pMUTs) and capacitive MUTs (cMUTs), have been developed and explored for endoscopic PAI applications. In this article, the recent progress of pMUTs (thickness extension mode and flexural vibration mode) and cMUTs are reviewed and discussed with their applications in endoscopic PAI. Current PAI endoscopes based on pMUTs and cMUTs are also introduced and compared. Finally, the remaining challenges and future directions of MEMS ultrasound transducers for endoscopic PAI applications are given.

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