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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Generation and reception of ultrasonic guided waves in compositeplates using conformable piezoelectric transmitters and optical-fiberdetectors
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Generation and reception of ultrasonic guided waves in compositeplates using conformable piezoelectric transmitters and optical-fiberdetectors

机译：使用合适的压电发射器和光纤探测器在复合板中生成和接收超声波导波

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摘要

A condition monitoring nondestructive evaluation (NDE) system,ncombining the generation of ultrasonic Lamb waves in thin compositenplates and their subsequent detection using an embedded optical fibernsystem is described. The acoustic source is of low profile with respectnto the composite plate thickness, surface conformable, and able tonefficiently launch a known Lamb wave mode, at operating frequenciesnbetween 100 and 500 kHz, over typical propagation distances of 100 ton500 mm. It incorporates both piezocomposite technology and interdigitalndesign techniques to generate the fundamental symmetrical Lamb wave modenin both metallic and carbon-fiber composite plates. Linear systems andnfinite element modeling techniques have been used to evaluate thenoperation of the transducer structure, and this is supplemented bynexperimental verification of the simulated data. An optical fiber,neither bonded to the surface or embedded across the length of thencomposite plate samples, is used to detect the propagating ultrasonicnLamb waves. Single mode silica fiber has been used in conjunction with anportable 633 nm Mach-Zehnder interferometer for signal demodulation andnsubsequent data acquisition. This hybrid system is shown to generate andndetect the fundamental symmetrical Lamb wave (s0) in bothncarbon-fiber and glass-fiber reinforced composite plates. Importantly,nthe system signal-to-noise ratio (SNR) associated with the acousticnsource compares favorably with s0 Lamb wave generation usingna conventional transducer and angled perspex wedge arrangement
机译：描述了一种状态监测非破坏性评估（NDE）系统，该系统将超声波兰姆波在薄复合板中的产生与随后使用嵌入式光纤系统的检测相结合。声源相对于复合板厚度而言是低轮廓的，表面适合的，并且能够在100吨至500kHz的典型传播距离上以100至500kHz之间的工作频率有效地发射已知的兰姆波模式。它结合了压电复合技术和叉指设计技术，以在金属和碳纤维复合板中产生基本对称的兰姆波模。线性系统和有限元建模技术已被用于评估换能器结构的运行状况，并通过对模拟数据的实验验证来补充这一点。既未粘结到表面也未埋入整个复合板样品的长度的光纤用于检测传播的超声波Lamb波。单模石英光纤已与便携式633 nm Mach-Zehnder干涉仪配合使用，用于信号解调和后续数据采集。该混合系统显示出可以在碳纤维和玻璃纤维增​​强复合板中生成并检测基本对称的兰姆波（s0）。重要的是，与声源相关的系统信噪比（SNR）与使用常规换能器和成角度的有机玻璃楔形布置产生的s0兰姆波相比具有优势。

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