提出一种基于非本征法布里-珀罗腔的新型光纤声发射传感器。采用数字光处理3D打印技术制备声振动敏感膜片,该结构基于灵活的数字模型设计,可一次成型,易于与标准光纤陶瓷插芯表面集成。实验结果表明:所制备的法布里-珀罗传感器具有较高的消光比;该声发射传感器在频率为600 Hz~2.4 kHz时具有较高的灵敏度,在频率为1.6 kHz时,声压灵敏度为2.81 mV/Pa。基于3D打印技术的光纤声发射传感器具有稳定性好、制备工艺简单等优点,在声发射检测领域具有潜在的应用前景。

A novel optical fiber acoustic emission sensor based on extrinsic Fabry-Perot cavity is proposed in this study. Digital optical processing 3D printing technology is used to create an acoustic vibration-sensitive diaphragm, and the structure is based on flexible digital model design and can be formed in one time. It is easy to integrate with the surface of a standard optical fiber ceramic insert. The experimental results show that the fabricated Fabry-Perot sensor exhibits a high extinction ratio. The acoustic emission sensor exhibits a high sensitivity in a frequency range of 600 Hz--2.4 kHz, and the pressure sensitivity is 2.81 mV/Pa at a frequency of 1.6 kHz. The proposed optical fiber acoustic emission sensor based on 3D printing technology is extremely stable and easy to be fabricated, and it has potential in the fields of acoustic emission detection.