一种光纤F-P声发射传感器的设计与实现

为克服压电陶瓷传感器易受电磁干扰、不能实现长期实时检测的缺点,提出了光纤非本征F-P结构测量声发射信号的思想.对光纤非本征F-P腔声发射测量原理进行分析,提出了双波长的稳定方法,并进行了结构参量的优化设计,确定了合适的反射比、波长及F-P腔长.理论分析和实验结果表明：所设计的非本征F-P光纤声发射传感器具有良好的敏感性和高分辨率.

The Design and Realization of an Optic Fibre F-P Acoustic Emission Sensor

In order to overcome the disadvantages of the piezoelectric ceramic sensor, i. e. susceptibility of electromagnetic disturbance and difficulty of real-time measurement,an extrinsic F-P interferometer sensor is offered . The principle for measuring AE signal of the fibre Extrinsic F-P interferometer instrument is analyzed. The stabilization method of the dual-wavelength is proposed. The structural parameter of this system is designed by optimal design with MATLAB 6. The F-P cavity length,reflectance and wavelength are confirmed. Theoretical analysis and experimental results indicate that the optic fiber extrinsic F-P interferometer AE sensor has refined sensitivity and high resolution, which provides a brand-new and effective way to measure AE signal.