Fiber-optic sensor-based remote acoustic emission measurement of composites
Fiber-optic sensor-based remote acoustic emission measurement of composites
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DOI：
10.1088/0964-1726/25/10/105033
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发表时间：
2016-10-01
影响因子：
4.1
通讯作者：
Shigeta, Naoki
中科院分区：
文献类型：
--
作者：
Yu, Fengming;Okabe, Yoji;Shigeta, Naoki
高温下的声发射（AE）检测可以明确高热复合材料的损伤过程。为了实现高温声发射检测，提出了一种基于宽带高灵敏度移相光纤光栅（PS-FBG）传感器的远程声发射测量方法。普通的光纤是由玻璃制成的，具有良好的耐热性。因此，在该方法中，使用光纤作为波导将复合材料中的声发射从高温环境传播到PS-FBG所在的室温环境。由于该方法具有特殊的声发射检测结构，是一种新型的粘接远程测量方法。实验和数值模拟结果表明，采用ADRM结构的PS-FBG传感器对声发射信号具有较好的遥感效果。这是因为细光纤提供了良好的波导系统和PS-FBG传感器对光纤芯轴向应变的灵敏度。因此，在ADRM配置中使用PS-FBG传感器的远程测量具有在高温条件下进行声发射检测的高潜力。
Acoustic emission (AE) detection functioning at high temperatures could clarify the damage process in high heat-resistant composites. To achieve the high-temperature AE detection, a remote AE measurement based on a phase-shifted fiber Bragg grating (PS-FBG) sensor with a high sensitivity over a broad bandwidth was proposed. The common optical fibers were made from glass with good heat resistance. Hence, in this method, optical fiber was used as the waveguide to propagate the AE in the composite from a high-temperature environment to the room-temperature environment wherein the PS-FBG was located. Owing to the special AE detection configuration, this method was a new adhesive method for remote measurement (ADRM). The experiment and numerical simulation revealed that the PS-FBG sensor in the ADRM configuration demonstrated accurate remote sensing for the AE signals. This was because of the good waveguide system provided by the thin optical fiber and the sensitivity of the PS-FBG sensor to the axial strain in the core of the fiber. Consequently, the remote measurement utilizing the PS-FBG sensor in the ADRM configuration has a high potential for AE detection in high-temperature conditions.