Laser ultrasonic visualization technique using a fiber-optic Bragg grating ultrasonic sensor with an improved adhesion configuration
Laser ultrasonic visualization technique using a fiber-optic Bragg grating ultrasonic sensor with an improved adhesion configuration
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DOI：
10.1177/1475921720932233
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发表时间：
2020-07-01
影响因子：
6.6
通讯作者：
Okabe, Yoji
中科院分区：
文献类型：
--
作者：
Yu, Fengming;Saito, Osamu;Okabe, Yoji
在本研究中，我们试图建立一个可靠的结构健康监测技术的复合材料相结合的相移光纤布拉格光栅传感与激光超声可视化技术。本文第一部分针对相移光纤光栅超声传感的方向性问题，设计了一种新型的交叉粘附结构。在粘附配置中，兰姆波由正交键合的光纤从粘附点引导到相移光纤布拉格光栅传感器。超声测量结果的分析表明，所提出的粘附方法使我们能够使用一个传感器接收兰姆波在所有的面内方向具有相似的幅度，因为两个波分量传播沿着与两个正交方向被引导到相移光纤布拉格光栅传感器，并表现出线性叠加在传感器。这种简化的配置使我们的方法优于现有的方法，如玫瑰花状配置，其中需要三个或更多个相移光纤布拉格光栅传感器来缓解感测方向性。相移光纤布拉格光栅超声传感器与建议的粘附配置，然后应用到可视化的超声波在铝板和碳纤维增强塑料层压板的传播。这些验证实验也表明，我们的新的粘附配置是有效的保护相移光纤布拉格光栅超声测量从传感方向性。同时，相移光纤布拉格光栅传感器的宽带宽使我们能够可视化各种兰姆波模式在宽频率范围内的传播行为。最后，我们还验证了超声可视化技术与相移光纤布拉格光栅超声传感相结合，可以用来识别隐藏在碳纤维增强塑料复合材料的损伤。
In this research, we attempt to establish a reliable structural health monitoring technique for composite materials by combining phase-shifted fiber-optic Bragg grating sensing with the laser ultrasonic visualization technology. In the first part of this article, a novel cross-adhesion configuration is designed to resolve the directionality problem of the phase-shifted fiber-optic Bragg grating ultrasonic sensing. In the adhesion configuration, Lamb waves are guided by an orthogonally bonded optical fiber from the adhesion point to the phase-shifted fiber-optic Bragg grating sensor. The analysis of the ultrasonic measurement results reveals that the proposed adhesion method enables us to use one sensor to receive Lamb waves in all in-plane directions with similar magnitude because two wave components propagating along with the two orthogonal directions are guided to the phase-shifted fiber-optic Bragg grating sensor and exhibit a linear superposition in the sensor. This simplified configuration gives our method an advantage over the existing approaches, such as the rosette configuration in which three or more phase-shifted fiber-optic Bragg grating sensors are required to relieve the sensing directionality. The phase-shifted fiber-optic Bragg grating ultrasonic sensor with the proposed adhesion configuration is then applied to visualize the propagation of ultrasonic waves in aluminum plates and carbon fiber-reinforced plastic laminates. Those verification experiments also show us that the new adhesion configuration is effective at protecting the phase-shifted fiber-optic Bragg grating ultrasonic measurement from the sensing directionality. Meanwhile, the broad bandwidth of the phase-shifted fiber-optic Bragg grating sensor enables us to visualize the propagation behavior of various Lamb wave modes over a broad frequency range. Finally, we also validate that the ultrasonic visualization technique merged with the phase-shifted fiber-optic Bragg grating ultrasonic sensing can be used to identify the hidden damage in the carbon fiber-reinforced plastic composite.