气溶胶吸收的光热干涉相位载波算法

摘要

Demodulation algorithm is the key technique of interferometry.Simulation and experiment study of the phase generation carrier(PGC)algorithem is done based on the fiber photo-thermal instrument.Firstly,the study found the mechanism of phase generated carrier algorithms for measuring phase change information;secondly,it verified the PGC algorithms through applying different voltage on piezoelectricity to simulate the actual aerosol absorption coefficient circumstance,and finally it com-pared corresponding results of different nitrogen dioxide concentration,simulating demodulation phase signal and interference pat-tern method.The results proove that the PGC algorithms can satisfy the requirements of the fiber photo-thermal aerosol absorp-tion measurement instrument.%解调算法是干涉测量的关键技术之一,通过初步搭建的光纤式光热干涉装置对相位载波解调算法进行了仿真与实验研究.介绍了装置采用的单光路垂直反射式干涉结构,阐述了相位载波调制解调的机理,并利用光纤式光热干涉装置,通过向压电陶瓷施加不同电压来模拟实际大气气溶胶吸收情况完成对相位载波算法解调能力的检验,并与不同质量浓度 NO2 标准气体下的实测相位信号、仿真解调相位信号和通过干涉条纹计算法获得的结果进行对比验证,证明相位载波解调算法可以满足光纤式光热干涉气溶胶吸收测量装置的信号解调工作的要求.