Imaging technique by means of measurements of electrical and ultrasonic properties using multifunctional piezoelectric ceramics censor

本研究的目的是实现电、超声特性的同时成像或监测系统。在本研究中，首先，作为电、超声特性同时成像的基础实验，利用所设计的传感器同时测量电、超声特性，检测被测对象的多个参数。该传感器由8个压电陶瓷（5mm×10mm）组成，每隔1mm排列一次。在实验中，通过设置在设备上部的传感器同时测量设备内填充的活体模型的电导率和传播时间的超声特性。从这些数据中检测出模型的温度和成分两类参数。结果发现，检测到多个参数。采用阵列式传感器组成了成像系统，并进行了成像演示。结果，由于测量精度不足，难以对其电学和超声特性进行成像。因此，必须改进测量系统和测量技术。作为将传感器布置在被测物体表面进行成像的基础实验，通过测量电导和传播时间来估计被测物体插入一对压电陶瓷之间的位置和直径两个参数。在直径为180mm的圆柱形设备的中心两侧布置一对压电陶瓷。设备内充入0.1% NaCl浓度的盐水，以浸泡0.1% NaCl浓度盐水的圆柱形石膏模型作为测量对象。结果表明，所提出的传感器可以检测到复数信息。

The aim of this study is to accomplish the simultaneous imaging or monitoring system of electrical and ultrasonic properties. In this research, firstly, as the basic experiment of the simultaneous imaging of electrical and ultrasonic properties, plural parameters of the measurement object were detected by simultaneous measurements of electrical and ultrasonic properties using the proposed sensor. The proposed sensor was constructed with eight piezoelectric ceramics (5mm×10mm) arrayed at interval of 1mm. As the experiment, conductance as the electrical property and propagation time as the ultrasonic property of the living body model filled in the equipment were simultaneously measured by the proposed sensor which was arranged at the upper side of the equipment. From these data, two kinds of parameters such as temperature and ingredient of the model were detected. As a result, it was found that plural parameters were detected. The imaging system using the array typed sensor was composed, and the imaging was demonstrated. As a result, it was difficult to image the electrical and ultrasonic properties because of insufficient measurement accuracy. Therefore, measurement system and measurement technique must be improved.As the basic experiment of imaging using the sensor which was arranged around the surface of measurement object, two parameters such as the position and diameter of the object inserted between a pair of piezoelectric ceramics were estimated from measurements of conductance and propagation time. A pair of piezoelectric ceramics was arranged to the sides through the center of the cylindrical equipment with a diameter of 180mm. The equipment was filled with saline water of 0.1% NaCl concentration and the cylindrical gypsum model soaked up saline water of 0.1% NaCl concentration was used as the measurement object. As a result, it was found that detection of the plural information by the proposed sensor was possible.