Sensitivity Enhancement of FBG Sensors for Acoustic Emission Using Waveguides
Sensitivity Enhancement of FBG Sensors for Acoustic Emission Using Waveguides
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使用波导增强声发射 FBG 传感器的灵敏度
DOI：
10.1007/s11340-016-0178-6
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发表时间：
2016
影响因子：
2.4
通讯作者：
Satomi SUZUKI and Shuichi WAKAYAMA
中科院分区：
文献类型：
--
作者：
Takenobu SAKAI;Satomi SUZUKI and Shuichi WAKAYAMA
由光纤制成的传感器由于其高精度而经常被用于测量应变。然而，由于其数据采集系统中的采样率较低，它们不常用于更高频率的应用。最近，已经开发出了满足声发射(AE)所需技术指标的采集系统，但由于其低信噪比(S/N)，这些类型的传感器并未被使用。然而，关于光纤Bragg光栅传感器(FBG传感器)提高灵敏度的研究很多。该传感器使用方便，在传感时不需要特定的参考光纤。在本研究中，为了提高S/N比，制作了超声显微镜中常用的声波导，并将其应用于FBG声发射传感器中。设计了两种类型的光波导：折射型和反射型。将FBG光纤连接到波导上，然后使用粘合剂将其固定在薄铝板上。通过折断盘子上的铅笔芯，脉冲输入到传感器中。结果表明，使用这些波导后，第一波的幅度有所增加。利用有限元分析方法，对波幅的提高进行了评估，从而使声波导可以用于提高光纤布拉格传感器的S/噪声比。
Sensors created from optical fibers are often used to measure strain due to their high accuracy. However, they are not used as often for higher frequency applications as a result of low sampling rates in their data acquisition systems. Recently, acquisition systems have been developed that satisfy the required specifications for use in acoustic emission (AE), but these types of sensors are not used due to their low signal-to-noise (S/N) ratios. However, there are many studies on the sensitivity enhancement conferred by the fiber Bragg grating sensor (FBG sensor). This sensor is easy to use and does not require specific reference fibers when sensing. In this study, acoustic waveguides, which are usually used in ultrasonic microscopes, were fabricated and used in FBG AE sensors to enhance the S/N ratio. Two types of waveguides were designed; the refraction type and the reflection type. FBG fibers were attached to the waveguides, which were then secured using adhesive to a thin aluminum plate. Impulses were inputted into the sensor by breaking pencil lead on the plate. The results showed that the amplitude of the first wave was increased using these waveguides. Using finite-element method (FEM) analysis, the enhancement of the wave amplitude was also evaluated such that the acoustic waveguide could be used for enhancement of the S/N ratio of FBG sensors.
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