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首页> 外文会议>18th International Conference on Adaptive Structures and Technologies(ICAST 2007) >Integrated Plate Acoustic Wave Sensors for In-situ NDT Applications
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Integrated Plate Acoustic Wave Sensors for In-situ NDT Applications

机译：用于原位无损检测应用的集成板式声波传感器

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摘要

For in-situ NDT applications, two different types of miniature and light-weight plate acoustic wave (PAW) transducers have been developed. In the first type, thick films (>40μm) piezoelectric ultrasonic films were directly deposited onto the end edges of aluminum and stainless steel plates using a sol-gel spray technique as integrated ultrasonic transducers. They were used to generate and receive symmetrical, anti-symmetric and shear horizontal types of PAWs in pulse/echo mode. The propagation length reached more than one meter in frequencies of several MHz. In 2 mm thick plates line defects of 1 mm width and 1 mm depth were clearly detected at room temperature and 150℃. This type of PAW transducers does not need couplant. In the second type the piezoelectric films were coated onto 50μm thick polyimide membranes as flexible ultrasonic transducers. These flexible thick film piezoelectric transducers made off-line were glued to the edges of the above mentioned plates as PAW transducers and to excite and detect the above mentioned three types of PAWs in pulse/echo mode as well. Measurements results at room temperature and/or 150℃ are presented and discussions of advantages and disadvantages of these two approaches are provided.
机译：对于现场NDT应用，已经开发了两种不同类型的微型和轻型平板声波（PAW）传感器。在第一种类型中，使用溶胶-凝胶喷涂技术作为集成超声换能器，将厚膜（>40μm）的压电超声膜直接沉积在铝板和不锈钢板的端部边缘上。它们用于以脉冲/回波模式生成和接收对称，反对称和剪切水平类型的PAW。在几兆赫兹的频率下，传播长度达到一米以上。在室温和150℃下，可以清楚地检测出2 mm厚的板中1 mm宽和1 mm深的线缺陷。这种类型的PAW传感器不需要耦合剂。在第二种类型中，压电膜作为柔性超声换能器涂覆在50μm厚的聚酰亚胺膜上。将离线制造的这些柔性厚膜压电换能器胶粘到上述板的边缘作为PAW换能器，并且还以脉冲/回波模式激发和检测上述三种类型的PAW。给出了室温和/或150℃下的测量结果，并讨论了这两种方法的优缺点。

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