光纤布拉格光栅对医用超声波的响应的研究

Study on the response of Fiber Prague grating on medical ultrasound

本文阐述了超声波和光纤光栅的特性,分析了光纤光栅对超声波的响应原理,设计了光纤光栅检测超声波的装置,模拟了光纤光栅受超声波作用后的反射谱,当超声波波长远大于光栅长度时,布拉格波长变化与超声波幅度成比例,通过光纤光栅的中心波长变化便可检测出超声波的特性。

This paper described the characteristics of the ultrasonic wave and a fiber grating,analyzed the response principle of fiber grating on ultrasonic. Optical fiber grating was designed to detect the ultrasonic apparatus. The reflection spectrum of the fiber grating was simulated by the ultrasonic wave. When the wavelength of the ultrasoundwas much longer than the length of grating,Bragg wavelength was proportional to the amplitude of the ultrasonic,and characteristic of the ultrasound can be detected through the changes of wavelength in thecenter of the fiber grating.