基于反射型光纤传感器的二次谐波仿真分析  

Simulation of Second Harmonic Based on Reflective Optical Fiber Sensor

作　　者：孙超[1,2] 丁建军[1] 章盛[1] SUN Chao;DING Jian-jun;ZHANG Sheng(School of Physics and Information Engineering,Jianghan University,Wuhan 430056 China;National NC System Engineer Research Center,Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]江汉大学物信学院,湖北武汉430056 [2]华中科技大学国家数控技术工程研究中心,湖北武汉430074

出　　处：《自动化技术与应用》2018年第11期126-129,共4页Techniques of Automation and Applications

基　　金：国家科技支撑项目(编号2013BAD11B02);国家科技支撑项目(编号2014BAD14B05-5);中国科学院科技服务网络计划合作项目(编号KFJ-SW-STS-172);武汉市市属高校产学研结合项目(编号CXY 201401)

摘　　要：本文基于差分光谱吸收来检测待测气体浓度:以Lambert-Beer定律为基础,利用MATLAB对整个实验进行模型的仿真。用周期变化的正弦波同时叠加三角波来模拟实验中的光源。加入谐波调制来消除噪声和基波分量的干扰从而得到携带浓度信息的二次谐波分量。最后改变给定的浓度,得到二次谐波电压值也会随之改变,记录不同浓度对应的二次谐波电压值,得到浓度与二次谐波电压的拟合曲线。仿真结果中待测气体的特征吸收波段、吸收系数、差分吸收电压值和二次谐波电压值满足检测要求。This paper is based on the Lambert-Beer law, the simulation of the whole experiment is carried out by using MATLAB. Sine waves with periodic changes are simultaneously superimposed on triangular waves to simulate the light source in the experiment. Adding harmonic modulation to eliminate the interference of noise and fundamental components to obtain the second harmonic components carrying the concentration information. Finally, changes the given concentration, the second harmonic voltage value also changes, records the corresponding concentration of the second harmonic voltage value, the concentration and the second harmonic voltage curve are obtained. The characteristic absorption band, absorption coeffcient, differential absorption voltage and second harmonic voltage of the gas to be measured in the simulation result meet the detection requirements.

关 键 词：光纤传感器 二次谐波 差分吸收 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]