• Title/Summary/Keyword: Transducers

Search Result 856, Processing Time 0.03 seconds

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.

  • https://doi.org/10.7776/ASK.2023.42.5.441 인용 PDF

Analysis of the Performance of Ultrasonic Transducers (초음파 탐촉자의 성능 평가법)

  • 노용래
    • The Journal of the Acoustical Society of Korea
    • /
    • v.10 no.6
    • /
    • pp.12-22
    • /
    • 1991

  • 초음파 탐촉자 성능의 이론적 평가법을 개발해 이중소자 탐촉자에 적용하였다. 본 방법은 탐촉 자의 발신, 회절, 수신특성을 주파수, 시간 영역에서 평가할 수 있으며, 특히 시간영역에서는 통상 사용 하는 역푸리에 변환법에 의존하지 않고 음파의 투과, 반사 특성을 고려해 파형을 직접 구할 수 있다.

  • PDF

PZT/PVDF Composite Ultrasonic Transducers and Its Experimental Estimate (PZT /PVDF 복합구조 초음파 트랜스듀서의 제안과 실험적 검토)

  • 김동현
    • Proceedings of the Acoustical Society of Korea Conference
    • /
    • 1997.06a
    • /
    • pp.64-67
    • /
    • 1997

  • PZT 및 PVDF의 장점을 이용한 송.수신 일체의 PZT/PVDF 복합구조 초음파 트랜스듀서를 제안하고, 그 특성을 분포정수형 등가회로를 이용하여 해석하였다. 특히 수신부의 PVDF를 다층으로 하여 송.수신 특성을 상당히 개선할 수 있음을 확인하였다.

  • PDF

Strength Development Monitoring of Concrete Using Smart PZT Transducers

  • Sung, Woo-Shin
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2009.05a
    • /
    • pp.573-574
    • /
    • 2009

  • The feasibility of electro-mechanical impedance (EMI) sensing technique, utilizing piezo-ceramic (PZT) patches, for online strength gain monitoring of early age concrete is investigated. An experimental study is conducted on PZT patch instrumented concrete specimens. The applicability of the EMI sensing technique for strength gain monitoring is discussed.

  • PDF