红外与毫米波学报2023，Vol.42Issue(2)：260-266,7.DOI:10.11972/j.issn.1001-9014.2023.02.017
红外合成孔径衍射光学系统成像特性建模与分析
Modeling and analysis for imaging characteristics of infrared array-aperture diffractive optical system
摘要
Abstract
This paper establishes the modulation transfer function (MTF) and signal-to-noise ratio (SNR) charac? terization models of the infrared array-aperture diffractive optical system based on the diffraction imaging mecha? nism. Subsequently, the imaging system diffraction efficiency is calculated based on the three-dimensional Finite Difference Time Domain (FDTD) method and the imaging characteristics are represented by combining the MTF and SNR. Finally, the effects of different working wavelengths, field of views and filling factors of the primary lens imaging characteristics are analyzed. The analysis results show that the diffraction efficiency, the MTF and SNR of infrared array-aperture diffractive optical system all have spectral and spatial variation characteristics, which reduce with the decrease of the primary lens filling factor. When the filling factor is 0. 6, the integral area of MTF decreases by 45. 42％ and the SNR decreases by 4. 92 dB compared with the ideal full aperture system. The established model can be used to characterize the imaging quality of infrared array-aperture diffractive optical system and provide reference to the imaging system design.关键词
光学遥感/红外合成孔径衍射光学系统/衍射效率/时域有限差分Key words
optical remote sensing/infrared array-aperture diffractive optical system/diffraction efficiency/finite difference time domain分类
数理科学引用本文复制引用
牛锐泽,乔凯,智喜洋,巩晋南,江世凯,田超..红外合成孔径衍射光学系统成像特性建模与分析[J].红外与毫米波学报,2023,42(2):260-266,7.基金项目
Supported by the National Natural Science Foundation of China under Grant 61975043 and 61605035. （）
