光纤F-P超声传感器设计实验研究

Design and experimental study on optical fiber F-P ultrasound sensor

设计了一非本征光纤F-P传感器结构,建立了双波长光纤F-P传感系统的数学优化模型;设计了F-P干涉腔长度和两路输出波长,建立了基于光纤F-P传感系统的激光超声实验装置;定性研究了激光参数、试样参数与超声波形特性之间的关系。实验结果表明:该传感系统能有效地检测超声信号,操作简单,实现容易,经济成本低。激光超声波的波形特性在很大程度上取决于试样参数和激光参数。

A structure of extrinsic optical fiber F-P sensor is designed. The mathematic optimal model of dual wavelength optical fiber F-P sensing system is established. The length of F-P cavity and wavelengths of two output light are designed by adopting optimum method. The experimental device of laser ultrasound based on optical fiber F-P sensing system is established. The relations between parameters of laser and sample and ultrasonic waveform＇ s characteristics are studied. The experimental results show the sensing system can detect laser ultrasonic wave signal efficiently. Its operation is simple. It is low cost and easy to realize. The characteristics of ultrasound waveform depends on the parameters of laser and sample mostly.