Papers by Keyword: PZT

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Authors: Kazuki Tajima, Hae Jin Hwang, Mutsuo Sando, Koichi Niihara
Authors: Kazuki Tajima, Hae Jin Hwang, Mutsuo Sando, Koichi Niihara
Authors: Gang Wang, Lei Qin, Li Kun Wang
Abstract: A new type of piezoelectric composite ultrasonic transducer with high frequency in radial vibration is studied. A high-frequency acoustic transducer has been designed and prepared with pzt-5-type piezoelectric ceramic cylinder. When the piezoelectric ceramic cylinder vibrates along the direction of its radial direction, the working frequency is high. It is composed of a piezoelectric ceramic tube and a steel bracket which is inserted in the inner of the ceramic tube. Use the finite element method by ANSYS for analyzing the radial vibration of a piezoelectric tube. On that basis, through managing ANSYS simulation the vibration mode of transducer system is obtained, and analyzed the working frequency of transducer. According to the simulation, the high-frequency cylindrical acoustic transducer has been produced. Comparing the products and the traditional cylindrical transducers, the products haven’t only a good all-round circle directional, but it also has a high working frequency (300 kHz).
Authors: Rosa Marat-Mendes, C.J. Dias, José N. Marat-Mendes
Authors: Yu Xin Peng, So Ito, Yuki Shimizu, Wei Gao
Abstract: In this paper, a novel Z-θZ micro-stage is designed and constructed by utilizing an impact friction drive. The stage is configured by two driving units, a moving element and a stage base. Each driving unit consists of two PZTs and a friction element. One end of each PZT is fixed on the stage base, and the other end is attached on a permanent magnet as the friction element. The moving element, which is a steel cylinder, is supported and moved by the friction element. Magnetic force generated by permanent magnet is utilized to stabilize the driving condition between the moving element and the friction element for the friction drive. The size of the stage is less than 1 cm3. The stroke and the maximum speed of the stage in the Z-direction are 3.8 mm, 5.7 mm/s, respectively. The stroke in the θZ-direction is unlimited and the maximum rotational velocity is 26 rpm.
Authors: Yong Bo Wu, Yu Feng Fan, M. Kato, Jun Wang, Katsuo Syoji, Tsunemoto Kuriyagawa
Authors: Qian Ying Tang, Yuan Liu, Ya Fan He, Ping Li, Xiao Dong Xie, Gang Wang
Abstract: This paper presents a new application of (Ba, Sr)TiO3(BST) and Pb(Zr, Ti)O3 (PZT) thin films in anti-fuse and their resulting anti-fuse behaviors. Compared with amorphous silicon, BST and PZT anti-fuses demonstrate distinct advantages: lower on-state resistance and lower breakdown electric field. With the sandwich-like structure of Pt/Ferroelectric Ceramics/Pt, the devices exhibit an apparent anti-fuse behavior. The resistivity of BST structure switches from 6.7 MΩ to 12.3 Ω at the average breakdown electric field of 0.3 MV/cm, while the PZT structure switches from 106 MΩ to 10.7 Ω at the average breakdown electric field of 1.3 MV/cm. Finally, the prospect of using BST and PZT is discussed and suggestions for their improvements are proposed.
Authors: Mao Qiang Li, Xue Feng Chen
Abstract: Ceramic discs are prepared with PZT powder doped with Sr and Mn, which is prepared through a modified Pechini process. A micro-actuator consists of two concentric rings with thickness of 0.15 mm made of PZT doped with Sr and Mn, a copper disc, on which the PZT rings are firmly mounted with organic glue, and a ceramic rod of φ2.5x100 mm stuck at the center of the disc. The top of the ceramic rod serves as pointer of the actuator. The outer PZT ring is equally divided into four quadrants separated each other, of which two vicinal parts are poled with the same direction as that of the inner PZT ring. The other two quadrants in the outer ring are poled with the opposite direction. The inner ring and the four quadrants of the outer ring are excited by three DC powers, respectively. Bending deformation of the copper disc is caused by properly regulating the excitation voltages exerted on the PZT ceramics. The position of the top of the ceramic rod varies with the bending deformation of the copper disc.
Authors: Rong Rong Qian, Zhi Yu Wen, Li Chen
Abstract: A novel piezoelectrically actuated scanning micromirror integrated with angle sensors is presented. The mirror with large size of 3×3mm2 locates in the center of the device, and piezoelectric actuators are symmetrically placed on both sides of the mirror. They are connected through torsion bars in which piezoelectric angle sensors are integrated. In order to obtain large deflection angle at a low operation voltage, the new actuator consisting of several parallel piezoelectric cantilevers is adopted. The machematical models of the mirror and piezoelectric actuator are given, and the piezoelectric angle sensors are designed to obtain high sensitivities. The simulation results indicate that the maximum mechanical deflection angle of the micromirror is 12.4° at an operation voltage of 25V, and the maximum output voltage of the angle sensor is 164.3mV. The resonant frequency associated with the torsional mode is 960Hz. The sensitivity of the angle sensor is 13.3mV/° without amplifying. The Scanning miromirror is suitable for optical scanning systems such as the microscope, the micro-spectrometer, the medical imaging, the barcode reader and so on.
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