激光单稳频指标的激光计量红外光谱仪精度分析  

Analysis of spectrum precision based on laser's monochromatic and stable frequency in Fourier transform infrared spectrometer

作　　者：柯志武[1] 马泳[1] 梁琨[1] 熊伟[1] 王宏远[1] 

机构地区：[1]华中科技大学电子与信息工程系武汉光电国家实验室,武汉430074

出　　处：《光学技术》2009年第2期248-251,255,共5页Optical Technique

摘　　要：在傅里叶变换红外光谱仪中,采用激光计量光程差可提高光谱的测量精度。激光波长作为光程差测量的基准单位,其线宽和稳频特性直接决定了光程差的误差,进而影响光谱的测量精度。根据光谱仪的干涉原理,通过傅里叶逆变换和误差分析方法,建立了光谱测量相对误差与激光单稳频指标之间的理论模型,并对该模型进行了仿真计算。结果证明,该模型可作为设计激光计量光程差光谱仪系统的理论依据。In Fourier transform infrared spectrometer, the optical path difference of laser metrology is applied to increase spectrum measure precision. The error of optical path difference is contributed by line-width and frequency stabilization of laser wavelength, which is the norm unit in this measure, and then the spectrum measure precision is also influenced. Based on the interference theory of imagers, according to the Fourier contrary transform and methods of error analysis, the theory model between relative error of spectrum measure and single frequency and steady frequency is established. Some simulation computations of the model are done, the result indicates, as a theory basis, the model can be applied in designing spectrometer system of laser metrology optical path difference.

关 键 词：激光技术 光谱测量 傅里叶逆变换 单稳频指标 光程差 

分 类 号：TN955[电子电信—信号与信息处理]