Numerical Simulation Analysis of Portable High-Speed FTIR Rotary Interferometers

被引：0
|
作者：
Qu L. [1 ,2 ,3 ]
Xu L. [1 ]
Liu J. [1 ]
Feng M. [4 ]
Liu W. [1 ]
Xu H. [1 ]
Jin L. [1 ]
机构：
[1] Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei
[2] University of Science and Technology of China, Hefei
[3] School of Physics and Electronic Information, Anhui Normal University, Wuhu
[4] School of Mechanical and Electrical Engineering, Chuzhou University, Chuzhou
来源：
Guangxue Xuebao/Acta Optica Sinica | 2021年 / 41卷 / 09期
关键词：
Fourier optics; Geometrical optics; Numerical analysis; Optical path difference; Portable Fourier infrared spectrometer;
D O I：
10.3788/AOS202141.0907001
中图分类号：
学科分类号：
摘要：
Rotary interferometers enable the miniaturization of portable Fourier infrared spectrometers and provide high-speed spectral output. However, their optical path difference (OPD) is nonlinear. In this paper, we analyzed the structure of a portable Fourier-transform infrared spectroscopy (FTIR) rotary interferometer in detail and built a reference coordinate system. Then, an OPD equation for the rotating mirror was deduced according to the geometrical optics principle. Numerical simulation analysis was carried out to illustrate the relationship of OPD with the thickness, refractive index, and rotation angle of the rotating mirror. In terms of sampling without reference laser, the nonlinear relation between OPD and rotation angle was fitted by polynomials to obtain the time non-uniformity corresponding to equal OPD. As a result, the sampling with equal OPD in the case of non-equal time was achieved. Compared with that of the equal-time sampling, the instability of OPD velocity was reduced to 1/5.3, which offered a greater instability margin for the speed control of the rotating mirror and also improved the vibration resistance of FTIR rotary interferometers. Our work provides data support and theoretical basis for the design parameter determination and optimization of portable high-speed FTIR rotary interferometers without reference laser. © 2021, Chinese Lasers Press. All right reserved.
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