基于光纤F-P传感器的激光超声测量虚拟仪器设计

Design of virtual instrument on laser ultrasound measurement based on optical fiber F-P sensor

传统超声检测仪器开发周期长,成本高,扩展性能差,已无法适应现代激光超声检测技术的发展。本文设计了非本征光纤F-P传感器,建立了基于光纤传感技术的激光超声测量实验装置,研制了测量材料物理参数的可视化虚拟仪器软件,采用峰值间距法实验测试了铜试样的声速和厚度。结果表明,光纤F-P传感器能有效用于超声信号的探测。开发的激光超声测量虚拟仪器测量材料物理参数时精度较高,测量材料厚度时,相对误差为3.67%,测量材料声速时,相对误差为3.79%,且界面友好,操作简单,实现容易,具有较强的灵活性。

The conventional ultrasound detection instrument＇s has many shortages such as development cycle long, higher cost, expansibility capability badly. It can＇ t be adapt to the development of modem laser ultrasotmd detection technology. In this paper, an extrinsic optical fiber F - P sensor is designed. The experimental device of laser ultrasonnd measurement based on optical fiber sensing technology is established. The visualization virtual instrument of measurement system is developed based on LabVIEW software. The sound velocity and thickness of copper sample are ~ by adopted peak distance method. The results show that optical fd^er F- P sensor can detect the ultrasound signals efficiency. The developed virtual instnnnent has higher precision and meets actual needs. Relative error is 3.67 % for measuring thickness of material. Relative error is 3.79 % for measuring sound velocity of material. The software has a friendly interface and good expansibility. It is characterized by simple operation, easy realization.