An Ultrasonic Imaging System Using a Matrix-Type Transducer Array

概要

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We propose a method for imaging an object's surface using a matrix-type transducer array. The matrix-type transducer array has a simple structure with some line-electrode fingers on both sides of a piezoelectric ceramic plate. By a combination of electrical-mechanical scanning, we image of an object's surface using data of distance between the transducer and the object. The ultrasonic probe used in the present system requires without beam forming and no signal processing for focusing. We measure two objects: one has a multilayered structure consisting of three differently sized aluminum plates, the biggest plate having an area of 150 mm×80 mm and 0.8-1.5 mm thickness; and the other is a radio-wave-absorbent block 100.5 mm×100.5 mm×18.5 mm in size with 5×5 holes in a grid made of ferrite. The ultrasonic probe operates at a frequency of 3.5 MHz and the sensing distance between the transducer and the measured object is about 80 mm. At this distance, the diameter of the ultrasonic beam launched from the transducer is about 13 mm. We obtained a height resolution of ±0.2 mm and a spatial resolution of about 3.0 mm.
社団法人応用物理学会の論文
1999-05-30