摘要
阐述了利用光纤布拉格光栅进行传感测量的基本原理与方法,讨论了由于超声波作用而引起的光纤布拉格光栅机械形变及折射率变化.引入分层传输矩阵法建立仿真模型,利用一组典型的光纤布拉格光栅参数并采用分层赋值与矩阵叠加的方法,数值模拟了超声波作用下光纤布拉格光栅的频谱特性.分析了该模型的有效作用条件及改变超声波波长及强度对光纤布拉格光栅频谱特性的影响.提出一种适用于多种条件下的利用光纤布拉格光栅测量超声波的方法,以及相应可供参考的仿真模型.
The theory and technique of using a fiber Bragg grating for sensing has been introduced. The geometrical modulation and refractive index variation of a fiber. Bragg grating caused by ultrasound wave have been discussed. The spectral character has been numerically simulated using the transfer matrix approach. The effect of both amplitude and wavelength of the US wave on the reflectivity of a fiber Bragg grating has been analyzed. The results of this analysis provide useful tools for the design of fiber Bragg gratings for ultrasound sensing meeting specific requirements.
出处
《江南大学学报（自然科学版）》
CAS
2007年第3期293-296,共4页
Joural of Jiangnan University (Natural Science Edition)
基金
教育部高等学校骨干教师项目(2002-111404)
