Development of broadband, omni-directional transducers for NDE applications

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI:10.1109/ULTSYM.2005.1602880

O. Keitmann-Curdes, M. Parusel, W. Wilkening, M. Mienkina, H. Ermert

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引用次数: 3

Abstract

In order to image highly reflecting (metallic) surfaces in a water-oil-emulsion under high pressure by means of ultrasound, broadband transducers with a wide opening angle (point-sources, spherical waves) are needed, which are not commercially available. Thus, efforts were made to develop and produce such ultrasonic transducers with a potential resistance against high static pressure of up to 400 bar. Most promising for this problem are piezoceramic hemispheres. Such elements generate spherical waves on either side. We decided to use the convex side of the hemisphere as the emitting ultrasonic aperture. Our transducer designs incorporate backing material and a twolayer matching to water. Different materials were investigated regarding their suitability as transducer backing media and regarding their compatibility with the designated ambient conditions. On the aperture side, two matching layers were designed consisting of metal and perspex (plexiglas). We present different realizations of ultrasonic transducers with 1...2 MHz center frequencies and optimized backing and matching materials. Recipes for easy transducer modeling will be provided. The presented transducers are mainly characterized by 6dBbandwidths of more than 50 % and opening angles of more than 120°. KeywordsNDE, Transducers

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用于无损检测应用的宽带、全向传感器的开发

为了在高压下对水-油乳化液中的高反射(金属)表面进行超声成像，需要具有大开口角(点源，球面波)的宽带换能器，这种换能器目前还没有商业化。因此，人们努力开发和生产这种能够抵抗高达400 bar的高静压的超声波换能器。最有希望解决这个问题的是压电陶瓷半球。这样的元素在两边产生球形波。我们决定使用半球的凸面作为发射超声波的孔径。我们的换能器设计包括衬底材料和与水匹配的双层材料。研究了不同材料作为换能器衬底介质的适用性及其与指定环境条件的兼容性。在孔侧，设计了两个匹配层，由金属和有机玻璃组成。我们提出了1…2的超声波换能器的不同实现兆赫中心频率和优化的背衬和匹配材料。将提供简便的换能器建模方法。该换能器的主要特点是带宽大于50%，开启角大于120°。KeywordsNDE,传感器

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IEEE Ultrasonics Symposium, 2005.

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