Gudra Tadeusz, Opielinski Krzysztof J
Institute of Telecommunications, Teleinformatics and Acoustics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e679-83. doi: 10.1016/j.ultras.2006.05.126. Epub 2006 Jun 6.
The main component of every device used for investigating internal object structure by Ultrasound Transmission Tomography (UTT) is a special ultrasonic probe. This paper presents the structure of model multielement ring probe for examining objects using this method in divergent ray projection geometry. The probe is made up of 1024 rectangular separate piezoelectric transducers working at frequency f=1.7 MHz, placed inside a ring with diameter D=30 cm and height h=9 cm. Each element of the probe is equipped with a quarter-wave matching layer. All the transducers function as transmitters and receivers, and can be joined in groups both during transmitting and during receiving. Some examples of admittance characteristics of a single piezoelectric transducer and examples of shapes of pulses generated and received by particular transducers were presented. Important factors affecting the measurement resolution are the sizes of the active surface of the transducers.
通过超声透射层析成像（UTT）用于研究内部物体结构的每个设备的主要组件是一个特殊的超声探头。本文介绍了用于在发散射线投影几何中使用此方法检查物体的模型多元素环形探头的结构。该探头由1024个矩形独立压电换能器组成，工作频率f = 1.7 MHz，放置在直径D = 30 cm、高度h = 9 cm的环内。探头的每个元件都配备有四分之一波长匹配层。所有换能器都用作发射器和接收器，并且在发射和接收期间都可以成组连接。给出了单个压电换能器的导纳特性示例以及特定换能器产生和接收的脉冲形状示例。影响测量分辨率的重要因素是换能器有源表面的尺寸。
