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像场调制傅里叶变换成像光谱仪的建模与实验研究

Modeling and Experiment of Image Field Modulated Fourier Transform Imaging Spectrometer

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摘要

为了明确像场调制傅里叶变换成像光谱仪的工作机理,通过分析多级微反射镜对成像光场的相位调制特性,建立了像场调制干涉成像的理论模型。数值计算结果表明,通过对获得的干涉图像数据立方体进行图像剪切与图像拼接,可以重构目标场景的全景图像;通过对剪切后的干涉图像单元进行条纹拼接与光谱解调,可以复原场景中各目标物点的光谱信息。为了验证该仪器的工作原理,利用研制的样机进行了目标场景的干涉成像扫描实验,获取了场景目标的干涉图像数据立方体。通过对各帧干涉图像进行边缘检测与特征配准,实现了干涉图像单元的剪切与全景图像的拼接。同时,通过对干涉图像单元进行条纹拼接、基线校正、寻址切趾与离散傅里叶变换,获得了特征目标的复原光谱,并通过非均匀采样校正与经验模态分解对光谱进行优化,提高了复原光谱的性能。

Abstract

In order to clarify the working mechanism of the image field modulated Fourier transform imaging spectrometer, we establish the theoretical model of an image field modulated interference imaging spectrometer by analyzing the phase modulation characteristics of the imaging field induced by a multi-micro-mirror. The numerical calculation shows that the panoramic image of the target scene can be reconstructed by image shearing and image splicing on the obtained interference image data cube. In addition, the spectral information of each target point in the scene can be recovered by fringe splicing and spectral demodulation on the sheared interference image unit. In order to verify the working principle of this instrument, we conduct the interference imaging scanning experiment of the target scene with the developed prototype and obtain the interference image data cube of the scene target. Through the edge detection and feature registration on each frame interference image, we realize the shearing of the interference image unit and the splicing of the panoramic image. Meanwhile, by means of fringe splicing, baseline correction, addressing apodization, and discrete Fourier transform, we recover the spectrum of the feature object. Finally, the recovered spectrum is optimized by means of non-uniform sampling correction and empirical mode decomposition, and the spectral performance is effectively improved.

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中图分类号:O433.1

DOI:10.3788/AOS202040.1811002

所属栏目:成像系统

基金项目:国家自然科学基金、吉林省科技发展计划、中国科学院青年创新促进会基金;

收稿日期:2020-05-06

修改稿日期:2020-06-09

网络出版日期:2020-09-01

作者单位    点击查看

吕金光:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033
赵百轩:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
梁静秋:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033
王维彪:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033
秦余欣:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033中国科学院大学, 北京 100049
陶金:中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林 长春 130033

联系人作者:吕金光(jinguanglv@163.com); 梁静秋(liangjq@ciomp.ac.cn);

备注:国家自然科学基金、吉林省科技发展计划、中国科学院青年创新促进会基金;

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引用该论文

Lü Jinguang,Zhao Baixuan,Liang Jingqiu,Wang Weibiao,Qin Yuxin,Tao Jin. Modeling and Experiment of Image Field Modulated Fourier Transform Imaging Spectrometer[J]. Acta Optica Sinica, 2020, 40(18): 1811002

吕金光,赵百轩,梁静秋,王维彪,秦余欣,陶金. 像场调制傅里叶变换成像光谱仪的建模与实验研究[J]. 光学学报, 2020, 40(18): 1811002

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