Wei Peng, Han Xiaole, Xia Dong, Liu Taolin, Lang Hao
School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China.
Sensors (Basel). 2018 Jan 13;18(1):215. doi: 10.3390/s18010215.
Acoustic emission technology has been applied to many fields for many years. However, the conventional piezoelectric acoustic emission sensors cannot be used in extreme environments, such as those with heavy electromagnetic interference, high pressure, or strong corrosion. In this paper, a novel fiber-optic ring acoustic emission sensor is proposed. The sensor exhibits high sensitivity, anti-electromagnetic interference, and corrosion resistance. First, the principle of a novel fiber-optic ring sensor is introduced. Different from piezoelectric and other fiber acoustic emission sensors, this novel sensor includes both a sensing skeleton and a sensing fiber. Second, a heterodyne interferometric demodulating method is presented. In addition, a fiber-optic ring sensor acoustic emission system is built based on this method. Finally, fiber-optic ring acoustic emission experiments are performed. The novel fiber-optic ring sensor is glued onto the surface of an aluminum plate. The 150 kHz standard continuous sinusoidal signals and broken lead signals are successfully detected by the novel fiber-optic ring acoustic emission sensor. In addition, comparison to the piezoelectric acoustic emission sensor is performed, which shows the availability and reliability of the novel fiber-optic ring acoustic emission sensor. In the future, this novel fiber-optic ring acoustic emission sensor will provide a new route to acoustic emission detection in harsh environments.
声发射技术已经在许多领域应用多年。然而，传统的压电声发射传感器无法在极端环境中使用，例如存在严重电磁干扰、高压或强腐蚀的环境。本文提出了一种新型光纤环形声发射传感器。该传感器具有高灵敏度、抗电磁干扰和耐腐蚀的特性。首先，介绍了一种新型光纤环形传感器的原理。与压电和其他光纤声发射传感器不同，这种新型传感器既包括传感骨架又包括传感光纤。其次，提出了一种外差干涉解调方法。此外，基于该方法构建了光纤环形传感器声发射系统。最后，进行了光纤环形声发射实验。将新型光纤环形传感器粘贴在铝板表面。新型光纤环形声发射传感器成功检测到了150kHz标准连续正弦信号和断铅信号。此外，与压电声发射传感器进行了比较，结果表明新型光纤环形声发射传感器的可用性和可靠性。未来，这种新型光纤环形声发射传感器将为恶劣环境下的声发射检测提供一条新途径。
