反射式强度型光纤声音传感器的光强调制特性  

Research on Light Intensity-Modulating Characteristic of Reflective Intensity Modulating Fiber Optical Acoustic Sensor

作　　者：蔡洁[1] 张认成[1] 吴仕平[1] 张亮[1] 

机构地区：[1]华侨大学机电及自动化学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2010年第3期252-255,共4页Journal of Huaqiao University(Natural Science)

基　　金：福建省高新技术研究开发重点项目(2005H036);福建省自然科学基金计划资助项目(D0810019);福建省厦门市科技计划项目(3502Z20083043)

摘　　要：在假设发送光纤出射端光强分布为高斯分布,以及平面镜成像原理和能量守恒的基础上,建立光纤声音传感器的光强调制函数,并对该函数进行仿真分析.光强调制特性的实验曲线与理论分析结果基本吻合,强度调制型光纤声音传感器中,薄膜的位移与声音的压力成正比.当薄膜和光纤端面距离在40~90μm的区间上,光强的变化与声压变化具有较好的线性关系,且线性度误差小,表明理论研究中对纤端光强分布的简化和基于平面镜成像的推导是合理的.The light intensity-modulating function of the fiber optical acoustic sensor is built on the basis that the light intensity distribution of the exit end of the emitting optical fiber is assumed as the Gauss distribution and the principle of plane mirror imaging and the principle of energy conservation is satisfied,also the function is simulated and analyzed.The experimental curve of the light-modulating characteristic closely fits the result of theoretical analysis,in which the membrane＇s displacement is proportional to the acoustic stress for the intensity modulation fiber-optic acoustic sensor.When the distance between the membrane and the fiber end is 40 to 90 μm,the light intensity varies with the acoustic stress in a good linear relationship and the linearity error is small,which has indicated that it is feasible for the simplification of the light intensity distribution at fiber ends and the derivation of the plane mirror imaging in the theoretical analysis.

关 键 词：光强调制函数 高斯分布模型 反射式强度型光纤声音传感器 平面镜成像原理 能量守恒 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]