• Title/Summary/Keyword: piezoelectric transducer

Search Result 391, Processing Time 0.028 seconds

Effect of CuO Additions on Microstructures and Piezoelectric Properties of the 0.4Pb$(Mg_{1/3}Nb_{2/3})O_3-0.25PbZrO_3-0.35PbTiO_3$ Ceramics (CuO 첨가에 따른 0.4Pb$(Mg_{1/3}Nb_{2/3})O_3-0.25PbZrO_3-0.35PbTiO_3$ 세라믹스의 압전특성과 미세조직의 변화)

  • Jeon, So-Hyun;Kim, Min-Soo;Jeong, Soon-Jong;Kim, In-Sung;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.11a
    • /
    • pp.194-194
    • /
    • 2008
  • Lead oxide based ceramics, represented by PZT, are the most widely used materials for piezoelectric actuators, sensors, and transducers due to their excellent piezoelectric properties. In particular, high-performance multilayered piezoelectric ceramics for advanced electronic components have drawn great attention. In order to develop piezoelectric ceramics capable of being sintered at low temperature for multilayer piezoelectric device applications, the effect of CuO additions on the microstructures and electromechanical properties of the 0.4Pb$(Mg_{1/3}Nb_{2/3})O_3-0.25PbZrO_3-0.35PbTiO_3$ ceramics was investigated. The samples with CuO addition were synthesized by ordinary sintering technique. X-ray diffractions indicated that all samples formed a single phase perovskite structure. The addition of CuO improved the sinterability of the samples and caused an increase in the density and grain size at low temperature. The optimum sintering temperature was lowered by CuO additions. Excellent piezoelectric and electromechanical responses, $d_{33}$ ~ 663 pC/N, $k_p$ ~ 0.72, were obtained for the samples of high density with 0.1 wt% CuO addition sintered at $1050^{\circ}C$ for 4 h in air. These results show that the piezoelectric properties of PMNZT ceramics can be improved by controlling the microstructure and this system is potentially a good candidate as multilayer piezoelectric device for a wide range of electro-mechanical transducer applications.

  • PDF

Fabrication of 1-3 Piezo-composites with a "Dice & Fill" Method and Characterization of Their Piezoelectric Properties as a Function of Lateral Spatial Scale ("Dice와 fill" 방식을 이용한 1-3 압전복합재의 제조와 횡방향 단위 크기에 따른 압전특성 평가)

  • Kim, Young-Deog;Kim, Kwang-Il;Jeong, Woo-Cheol;Kim, Heung-Rak;Kim, Dong-Su
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.22 no.4
    • /
    • pp.354-360
    • /
    • 2002
  • The piezoelectric composites had many advantages in comparison with conventional piezoelectric ceramics and piezopolymers for ultrasonic transducers used in NDT and in medical ultrasionic imaging. The electromechanical coupling coefficient should be high and the acoustic impedance should be low in these applications. However, the cross-coupling with spurious oscillations caused by laterally running plate waves exhibited complex motions in the surface of piezoelectric composites with coarse lateral spatial scale. The thickness mode electromechanical coupling coefficient of 1-3type of piezoelectric compoistes were 0.36 to 0.64, and the acoustic impedance of them were 9.8 to 22.7 MRayl. The lateral resonance frequency of 1-3 type piezoelectric composites shifted to high frequency region with decreasing lateral spatial scale.

Design and Evaluation of Ultrasonic Flow Meter for High Temperature by Using Finite Element Method (유한요소법을 이용한 고온용 초음파 유량센서의 설계 및 평가)

  • Lee, Joo-Hee;Kim, Chang-Il;Paik, Jong-Hoo;Cho, Jeong-Ho;Jeong, Young-Hun;Lee, Young-Jin;Nahm, Sahn
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.24 no.11
    • /
    • pp.859-864
    • /
    • 2011
  • An operation temperature of $Pb(Zr,Ti)O_3$ based piezoelectric ultrasonic flowmeter was generally restricted to below 200$^{\circ}C$ due to a low depoling temperature of its ceramic material. Thus, a new designed piezoelectric ultrasonic flowmeter was fabricated in order to protect from the extremely hot fluid. Its structure is optimized by a finite element method to effectively stop heat flowing along a waveguide. Various materials such as Cu, Al, SUS were examined as a multi-plate radiation shield to enhance the performance of piezoelectric ultrasonic flowmeter. The SUS was evaluated as the most effective material to enhance the performance of piezoelectric ultrasonic flowmeter. As the number of plates of the radiation shield increased, the temperature at piezoelectric transducer away from the hot fluid was constantly decreased with a ratio of 3.12$^{\circ}C$ per the plate number.

Optically transparent ultrasound transducers for combined ultrasound and photoacoustic imaging: A review (초음파-광음향 융합 영상을 위한 투명 초음파 변환기)

  • Shunghun Park;Jin Ho Chang
    • The Journal of the Acoustical Society of Korea
    • /
    • v.42 no.5
    • /
    • pp.441-451
    • /
    • 2023
  • Ultrasound transducers are an essential component of combined photoacoustic and ultrasound imaging systems and play an important role in image evaluation. However, ultrasound transducers are opaque; therefore, light must bypass the ultrasound transducer to reach the target point to produce a photoacoustic image. Providing different paths for the optical and acoustic signals results in a complicated system design, increasing the system volume. To overcome these problems, an optically Transparent Ultrasound Transducer (TUT) was developed. Unlike conventional opaque ultrasound transducers, optically TUT can be fabricated by a variety of manufacturing methods and they are suitable for use with specific piezoelectric elements and serve various purposes. In this study, a comparative analysis of the results of using Lithium Niobate (LNO), Lead Magnesium Niobate-Lead Titanate (PMN-PT), and Polyvinylidene Difluoride (PVDF), which are materials used in piezoelectric element-based TUT. LNO is a piezoelectric element widely used in TUT, and PMN-PT has been actively studied recently with a higher transmission and reception rate than LNO. Existing TUT have lower ultrasound resolution than photoacoustic resolution, but they have recently been manufacturing focused TUT with high ultrasound resolution using PVDF. A comparative analysis of the production results of these TUT was performed.

A Study for the Measurement of a fluid Density in a ripe Using Elastic Waves

  • Kim, Jin-Oh;Hwang, Kyo-Kwang;Bau, Haim-H.
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.23 no.6
    • /
    • pp.583-593
    • /
    • 2003
  • The effect of liquid confined in a pipe on elastic waves propagating in the pipe wall was studied theoretically and experimentally. The axisymmetric motion of the wave was modeled with the cylindrical membrane shell theory. The liquid pressure satisfying the axisymmetric wave equation was included in the governing equation as a radial load. The phase speed of the wave propagating in the axial direction was calculated, accounting for the apparent mass of the liquid. Experiments were performed in a pipe equipped with ring-shaped, piezoelectric transducers that were used for transmitting and receiving axisymmetric elastic waves in the pipe wall. The measured wave speeds were compared with the analytical ones. This work demonstrates the feasibility of using pipe waves for the determination of the density and, eventually, the flow rate of the liquid in a pipe.

Development of Dynamic Pressure Calibrator with Positive Step Pressure (정방향 스텝 동압력 교정장치 개발)

  • 최주호;홍성수;우삼용;이경희;김창복
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.4 no.1
    • /
    • pp.155-169
    • /
    • 2001
  • In this paper, dynamic pressure is mainly generated in the closed chamber of gun when the propellant is fired and has exponential pressure motion. Dynamic pressure calibrator with positive step pressure was designed and manufactured to meet the calibration of piezoelectric high pressure transducers which are mainly used to measure dynamic pressure motion in the test of weapon systems. In addition, the results of Performance test and analysis of system uncertainty are provided.

  • PDF

Active-Sensing Lamb Wave Propagations for Damage Identification in Honeycomb Aluminum Panels

  • Flynn, Eric B.;Swartz, R.Andrew;Backman, Daniel E.;Park, Gyu-Hae;Farrar, Charles R.
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.29 no.4
    • /
    • pp.269-282
    • /
    • 2009
  • This paper presents a novel approach for Lamb wave based structural health monitoring(SHM) in honeycomb aluminum panels. In this study, a suite of three signal processing algorithms are employed to improve the damage detection capability. The signal processing algorithms used include wavelet attenuation, correlation coefficients of power density spectra, and triangulation of reflected waves. Piezoelectric transducers are utilized as both sensors and actuators for Lamb wave propagation. These SHM algorithms are built into a MatLab interface that integrates and automates the hardware and software operations and displays the results for each algorithm to the analyst for side by side comparison. The effectiveness of each of these signal processing algorithms for SHM in honeycomb aluminum panels under a variety of damage conditions is then demonstrated.

A study on characteristics of piezo-buzzer for pressure sensor (압력센서용 압전부저의 특성에 관한 연구)

  • 신영록;김홍근;김철한;최헌일;사공건
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2001.07a
    • /
    • pp.985-988
    • /
    • 2001
  • A piezo-buzzer being used for the purpose of generation of audible frequency, which is a electric-acoustic transducer utilizing the inverse piezoelectric effect. Also it can be used for a pressure sensor according to the piezoelectric effect. But the output of a piezo-buzzer is a differential signal. In this study, we've made a system that can measure a real pressure by integration of output signal. According to our results, it could be found a possibility of application for pressure sensor by measurement of output characteristics when a piezo-buzzer was pressurized and depressurized, and by measuring of an error by means of the drift current of OP-Amp, etc..

  • PDF

Scanning confocal microscope by direct oscillation of an optical fiber (광섬유의 직접 구동에 의한 공초점 현미경)

  • 김종배;류광현;박두성;노정은;권남익
    • Korean Journal of Optics and Photonics
    • /
    • v.14 no.1
    • /
    • pp.80-84
    • /
    • 2003
  • We have constructed a scanning confocal microscope by directly oscillating an optical fiber in two different ways. Either a piezoelectric transducer or a tuning fork was used for the oscillation. Six frames of $640{\times}480$ pixel image were obtained in a second with piezoelectric oscillation and only one image of the same size was obtained in a second with tuning fork oscillation. Oscillation of optical fiber did not cause amy distortion of confocal images.

Optical Coherence Tomography with Sinusoidal-Wave Drive an Optical Delay Line using Piezoelectrics Strecher (정현파로 구동되는 PZT 광경로 지연기를 이용한 광 간섭 단층촬영시스템)

  • Kim, Young-Kwan;Kim, Yong-Pyung
    • Korean Journal of Optics and Photonics
    • /
    • v.18 no.4
    • /
    • pp.274-279
    • /
    • 2007
  • We fabricated and characterized an optical delay line for optical coherence tomography (OCT). The delay line was composed of a cylindrical piezoelectric transduce (PZT) and a single mode optical fiber. The OCT system used a duplex scanning optical delay line which was symmetrically driven in the reference and sample arms. We showed that the sinusoidal-wave was superior to a triangular-wave for driving the optical delay line for scanning depth and repeatability.