• Title/Summary/Keyword: Linear Array Ultrasonic Transducer

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Design and Fabrication of Linear-Array Ultrasonic Transducer Using KLM and FEM Simulation for Non-Destructive Testing (KLM 및 FEM 시뮬레이션을 이용한 비파괴검사용 선형배열 초음파 탐촉자의 설계 및 제작)

  • Park, Chan-Yuk;Sung, Jin-Ho;Jeong, Jong-Seob
    • Journal of the Korean Society for Nondestructive Testing
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    • v.35 no.2
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    • pp.120-127
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    • 2015
  • In this paper, a linear-array transducer capable of overcoming the faults of a single element and phased array transducers with convex shape for non-destructive ultrasonic testing was designed and fabricated. A 5.5 MHz linear-array transducer was designed using the PiezoCAD program based on the KLM analysis and the PZFlex program based on the FEM analysis. A 2-2 composite structure was employed to achieve broad-band characteristics. A 128 element linear-array transducer was fabricated and its performance was compared with the simulation results. The center frequency of the fabricated transducer was 5.5 MHz and the -6 dB frequency bandwidth was 70 %. Thus, we expect that the designed transducer can provide an effective inner image of the test material during non-destructive ultrasonic testing.

Design and Fabrication of Linear Array Transducer for Ultrasonic Medical Imaging System (초음파 의료 진단 장치용 선형 배열 변환기의 설계 및 제작)

  • Cho, Yeong-Hwan;Sung, Keong-Mo
    • Proceedings of the KOSOMBE Conference
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    • v.1990 no.05
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    • pp.29-32
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    • 1990
  • In this paper, we designed and fabricated linear array transducer for ultrasonic medical imaging system. Fabricated transducer is 85mm in length and has 64 elements. It shows good sensitivity and band width characteristics compared with commercial transducers.

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Design and fabrication of a 20 MHz high frequency linear array ultrasonic transducer for medical use (20 MHz 의료용 고주파 선형 배열 초음파 트랜스듀서의 설계 및 제작)

  • Lee, Wonseok;Roh, Yongrae
    • The Journal of the Acoustical Society of Korea
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    • v.35 no.6
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    • pp.466-472
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    • 2016
  • In this work, a medical linear array ultrasonic transducer working in the range of 20 MHz has been developed for high-resolution ultrasonic imaging. After devising the structure of the transducer suitable for the transmission of high-frequency waves, we optimized the dimension of constituent components. Then, the process to fabricate the transducer was developed to realize the designed structure, and a prototype of the transducer was fabricated and characterized. The center frequency of the fabricated transducer was measured to be 19 MHz, and the fractional bandwidth to be 84.5 %, and the standard deviation of the sensitivity over the entire channels to be 0.74 dB. These measurement results showed good agreement with design data, which confirmed the validity of the high frequency ultrasonic transducer structure developed in this work. It was confirmed that the developed transducer with new structure had wider frequency bandwidth and uniform sensitivity than a conventional 20 MHz transducer.

A Study on an Ultrasonic Phased Array Transducer with a Spherical Liquid Lens (구면 액체 렌즈 초음파 위상 배역 변환기에 관한 연구)

  • 윤영중;박한규
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.11
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    • pp.9-16
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    • 1995
  • In this paper, an ultrasonic phased array transducer with spherical liquid lens, which utilizes both electronic focusing by linear phased array and variable geometric focusing by spherical lens. is investigated. This system reduces the elevational beamwidth which is disadvantage of the 1-dimensional linear phased array, and adds real-time dynamic focusing capability by controlling the volume of liquid in the lens. A prototype of this transducer is constructed and tested. The experimental results are compared with those of computer simulations. The range of applications are in the hyperthermia applicators or ultrasonic image system with narrow beam and rapid scanning characterisitcs.

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Analysis of the Ultrasonic Beam Profile Due to Variation of the Inter-Element Spacing for the Phased Array Transducer (페이즈드 어레이 트랜스듀서에 있어서 구성 압전소자의 간격 변화에 따른 초음파 빔 전파 특성 해석)

  • Choe, Sang-U;Lee, Jun-Hyeon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.4 s.175
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    • pp.972-981
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    • 2000
  • The phased array transducer has two distinct advantages. One is rapid scanning comparing with the conventional mechanical or manual scanning system. Therefore, output image is represented in real-time. The other is the dynamic focusing and the dynamic steering of ultrasonic beam. Only the delay times that are controlled electrically are used to focus and to steer beam without any lenses or wedges. In this study, the profile of the ultrasonic beam for the phased array transducer has been simulated in the Huygens principle with varying the inter-element spacing of the linear phased array transducer. From the result of this study, it was found that the ultrasonic beam spread wider as the inter-element spacing was decreased. However, the focusing effect was improved, even when the number of the element was not big. In addition, there was grating lobes that are constructed when the inter-element spacing is more than half wavelength. However, this grating lobe has lower amplitude than the main lobe.

A Performance Improvement of Ultrasonic Diagnosis Transducer by Transient Acoustic Field Analysis (과도음장 해석을 통한 초음파 진단 탐촉자의 성능 개선)

  • 박은주;송행용;김무준;김동현;이수성;하강열
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.8
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    • pp.744-756
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    • 2002
  • The transient acoustic fields formed by a 3.5 ㎒ curved linear array transducer which is commonly used in ultrasonic medical imaging system for diagnosis of abdomen are systematically analyzed to obtain new design parameters for the better acoustic image. In the analysis with an assumption of radiating waveform, element size, radius of curvature, amplitude apodization are considered as parameters giving constitutive relations with the fields. As simulation results, appropriate new parameters with the reduced curvature and elevation aperture and the apodization of Hamming window, which make an improved acoustic beam with lower side lobe levels than a conventional typical transducer, are obtained.

Feasibility Study on Detection of Defective Elements in a Linear Phased Array Transducer through Ultrasonic Field Analysis and Visualization (초음파 음장해석 및 가시화를 통한 선형 위상차배열 트랜스듀서의 결함요소 검출 가능성 연구)

  • Choi, Kwang-Yoon;Yang, Jeong-Won;Ha, Kang-Lyeol;Kim, Moo-Joon;Kim, Jung-Soon;Lee, Chae-Bong
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.5
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    • pp.416-423
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    • 2009
  • The ultrasonic pressure fields for the 3 MHz linear phased array transducer with sixteen piezoelectric elements of which one may not be operated by defect were simulated theoretically and measured experimentally using a visualization system of the Schlieren method. The simulation results for steering angles of $0^{\circ}$ and $30^{\circ}$ show that the side-lobe patterns of the transducer including a defective element is quite different from the transducer with all normal elements, and those patterns are in good agreement with the results of visualization. It is shown that the defective elements in a linear array transducer can be detected by comparison of the simulated and the visualized side-lobe patterns in two dimensional acoustic fields.

A Study on the Cross Talk Level in a Piezoelectric Ultrasonic Array Transducer (압전형 초음파 배열 변환기의 음향간섭 레벨에 관한 연구)

  • 이수성;김영신;노용래
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.1
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    • pp.56-61
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    • 2002
  • In piezoelectric ultrasonic linear array transducers widely used for diagnosis, the cross talk caused by the structural cross-coupling between adjacent elements inside the transducer affects the probe performance in a significant manner. In this study, we constructed a finite element model of a piezoelectric ultrasonic transducer, and analyzed its cross talk level with respect to the shape of and materials inside the kerf, The results of this work can be utilized in optimal design of the transducers for medical diagonosis and treatment as well as W applications.

A Study for Reducing the Acoustic Cross Talk Level in an Array Type Piezoelectric Ultrasonic Transducer Using Acoustic Wells (음향 벽을 이용한 배열형 압전형 초음파 변환기의 음향 간섭 수준 감소를 위한 연구)

  • 김영신;노용래
    • The Journal of the Acoustical Society of Korea
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    • v.22 no.3
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    • pp.208-216
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    • 2003
  • In one dimensional linear array type piezoelectric ultrasonic transducers widely used for medical diagnosis, the acoustic cross talk caused by the structural acoustic coupling between the adjacent piezoelectric elements reduces significantly their performance. In the study, we have proposed an acoustic wall to reduce the acoustic cross talk by wave propagation through the surface the transducer which can not be prevented by conventional kerf and have analyzed using a finite element method the acoustic cross talk level with respect to the shape, size and materials of the acoustic wall mounted on a convex one dimensional piezoelectric ultrasonic transducer. We expect that the simulated results provide us with a valuable information to make an optimized design of the way type ultrasonic transducer minimizing the acoustic cross talk level.

Time Reversal Beam Focusing of Ultrasonic Array Transducer on a Defect in a Two Layer Medium

  • Jeong, Hyun-Jo;Lee, Jeong-Sik;Bae, Sung-Min
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.3
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    • pp.242-247
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    • 2009
  • The ability of time reversal techniques to focus ultrasonic beams on the source location is important in many aspects of ultrasonic nondestructive evaluation. In this paper, we investigate the time reversal beam focusing of ultrasonic array sensors on a defect in layered media. Numerical modeling is performed using the commercially available software which employs a time domain finite difference method. Two different time reversal approaches are considered - the through transmission and the pulse-echo. Linear array sensors composed of N elements of line sources are used for signal reception/excitation, time reversal, and reemission in time reversal processes associated with the scattering source of a side-drilled hole located in the second layer of two layer structure. The simulation results demonstrate the time reversal focusing even with multiple reflections from the interface of layered structure. We examine the focusing resolution that is related to the propagation distance, the size of array sensor and the wavelength.