29 積層高分子超音波トランスデューサによる PE 製ガス管 EF 継手部の非破壊評価

概要

論文の詳細を見る
We have developed a wide-band ultrasonic transducer using a piezoelectric copolymer P (VDF-TrFE) in order to test the integrity of PE gas pipes with high resolution and sensitivity. Ultrasonic transducers with lower frequency characteristics are needed to test plastic material such as PE, which is easy to attenuate ultrasonic wave. Then, we tried to control the frequency characteristics of the transducers by laminating a few thin piezoelectric copolymer films. The performance of the transducers was evaluated by measuring the resonant characteristic of the transducers in frequency and detecting reflected wave from object in water and in PE. It has been found that in laminated ultrasonic transducers the thickness of electrode layers and adhesive layers affected to the frequency response of the transducers strongly. The developed transducer detected a small defect in PE gas pipes with big amplitude and a little ringing.
一般社団法人日本機械学会の論文
2002-08-06