An ultrasonic visualization system using a fiber-optic Bragg grating sensor and its application to damage detection at a temperature of 1000 °C
An ultrasonic visualization system using a fiber-optic Bragg grating sensor and its application to damage detection at a temperature of 1000 °C
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DOI：
10.1016/j.ymssp.2020.107140
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发表时间：
2021-01-15
影响因子：
8.4
通讯作者：
Okabe, Yoji
中科院分区：
文献类型：
--
作者：
Yu, Fengming;Saito, Osamu;Okabe, Yoji
需要结构健康监测（SHM）技术来评估老化耐热结构的可靠性。为了建立高温原位损伤诊断方法，作者开发了一种具有耐热光纤布拉格光栅（FBG）传感配置的激光超声可视化系统。在该系统中，通过材料表面的激光照射激发超声波，然后由远程安装的 FBG 传感器接收。由于波激励和波传感部件都具有优异的耐热性，因此所提出的传感系统能够在 1000 摄氏度的温度下进行稳定的超声波测量。在本研究中，波数-频率分析表明，所提出的传感系统能够在平面结构中可视化正确的激光超声波场。然后在 200 和 1000 摄氏度的温度下验证耐热材料板的超声可视化性能。还进行了基于三维傅立叶变换的波数频率分析，以提取与板中的人工缺陷引起的反射相对应的波分量。因此，所开发的方法能够在高达 1000 摄氏度的温度下清晰地识别损坏。 (C) 2020 Elsevier Ltd. 保留所有权利。
Structural health monitoring (SHM) techniques are required to evaluate the reliability of aging heat-resistant structures. To build a method of high-temperature in situ damage diagnosis, the authors developed a laser ultrasonic visualization system with a heat-resistant fiber-optic Bragg grating (FBG) sensing configuration. In this system, an ultrasonic wave is excited by laser irradiation on the surface of a material and then received by a remotely installed FBG sensor. Because both the wave excitation and wave sensing parts have excellent heat resistance, the proposed sensing system enables a stable ultrasonic measurement at a temperature of 1000 degrees C. In this research, a wavenumber-frequency analysis shows that the proposed sensing system was able to visualize the correct laser ultrasonic wavefield in a planar structure. The ultrasonic visualization performance was then verified for a plate of heat-resistant material at temperatures of 200 and 1000 degrees C. A wavenumber frequency analysis based on a three-dimensional Fourier transform was also conducted to extract the wave components corresponding to the reflection caused by an artificial defect in the plate. As a result, the developed method enabled clear damage identification at temperatures as high as 1000 degrees C. (C) 2020 Elsevier Ltd. All rights reserved.