• Title/Summary/Keyword: Piezoelectric Ceramics

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The effect of $MnO_2$ Addition to the PZT-PNN Piezoelectric Ceramics used in Ultrasonic Sensor (Receiver) (초음파 센서(수신기)용 PZT-PNN계 압전세라믹스에 $MnO_2$/ 첨가가 미치는 영향)

  • 조봉희;손은영;김현재;박창엽
    • Electrical & Electronic Materials
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    • v.1 no.4
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    • pp.311-318
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    • 1988

  • 초음파센서(수신기)에 응용가능한 압전세라믹스를 제조하기 위하여 Ba변조된 Pb(ZR, Ti)O$_{3}$계 세라믹스에 MnO$_{2}$를 첨가하여 첨가량과 소성온도에 따른 영향을 조사하였다. 또한 제조된 압전세라믹스를 이용하여 초음파 수신기를 제작하여 수신특성을 확인하여 보았다. 그 겨로가 MnO$_{2}$가 0.4(wt%)첨가되었을 때 압전 g정수가 가장 크고 수신감도가 우수한 것으로 밝혀졌다.

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Characteristic Variation of Underwater Acoustic Transducer with Long Term Operation (능동 수중음향 트랜스듀서의 장기동작 특성)

  • Seo, Hee-Seon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.05a
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    • pp.817-820
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    • 2006

  • The Tonpilz transducer is one of the essential elements in active sonar application. The characteristics of transducer depend on the piezoelectric ceramics and mechanical elements such as head mass, tail mass, pre-stress rod and so on. One of the important characteristics is electric and mechanical stability of transducer for long term high power transmitting operation. This parer presents the results about long term endurance tests of the underwater acoustic transducer.

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3-D Underwater Object Recognition Independent of Translation Using Porous PZT Ultrasonic Sensor (다공질 압전 초음파 센서를 이용한 물체변위에 무관한 3차원 수중 물체인식)

  • Cho, Hyun-Chul;Lee, Kee-Seong;Lee, Su-Ho;Park, Jung-Hak;SaGong, Geon
    • Proceedings of the KIEE Conference
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    • 1997.07d
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    • pp.1370-1372
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    • 1997

  • In this study, 3-D underwater object recognition using ultrasonic sensor fabricated with porous piezoelectric ceramics and SCL(Simple Competitive Learning) neural networks are presented. The recognition rates for the training data and the testing dara were 96 and 93%, respectively.

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