Dual-order overlapped Offner imaging spectrometer in middle- and long- wave infrared regions

ZHANG Hao; FANG Wei; YE Xin; JIANG Ming; SONG Bao-qi

doi:10.3788/OPE.20152304.0965

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Dual-order overlapped Offner imaging spectrometer in middle- and long- wave infrared regions

更新时间：2020-08-13

- Dual-order overlapped Offner imaging spectrometer in middle- and long- wave infrared regions
- Optics and Precision Engineering Vol. 23, Issue 4, Pages: 965-974(2015)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152304.0965
  CLC： TP73;TH744.1
- Received：23 December 2013，
  
  Revised：21 January 2014，
  
  Published：25 April 2015
- 稿件说明：
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张浩, 方伟, 叶新等. 中/长波红外双衍射级次共路Offner成像光谱仪[J]. 光学精密工程, 2015,23(4): 965-974

ZHANG Hao, FANG Wei, YE Xin etc. Dual-order overlapped Offner imaging spectrometer in middle- and long- wave infrared regions[J]. Editorial Office of Optics and Precision Engineering, 2015,23(4): 965-974
张浩, 方伟, 叶新等. 中/长波红外双衍射级次共路Offner成像光谱仪[J]. 光学精密工程, 2015,23(4): 965-974 DOI： 10.3788/OPE.20152304.0965.

ZHANG Hao, FANG Wei, YE Xin etc. Dual-order overlapped Offner imaging spectrometer in middle- and long- wave infrared regions[J]. Editorial Office of Optics and Precision Engineering, 2015,23(4): 965-974 DOI： 10.3788/OPE.20152304.0965.

摘要

为提高成像光谱仪的工作波长范围

提出了基于双波段焦平面探测器(FPAs)的双衍射级次全共路Offner成像光谱仪结构。该结构中凸面光栅的一级衍射光和二级衍射光完全重叠共路传输

并可由焦平面处的双波段红外焦平面探测器IR FPAs实现级次的自然分离和同时探测。分析了该结构的工作原理和设计方法

基于几何光线追迹法仿真了谱线弯曲和色畸变特性

基于Huygens点扩散函数(PSF)仿真了光谱响应函数(SRF)并导出了光谱带宽。实验显示:双衍射级次共路Offner成像光谱仪的工作波段为3~6 μm(二级衍射)和6~12 μm(一级衍射)

谱线弯曲和色畸变均小于0.5个像元宽度

光谱带宽分别为13.2~14.3 nm(二级衍射)和28.3~33.3 nm(一级衍射)

两个工作波段内的衍射效率均大于或等于20%。整个系统结构简单紧凑、光谱范围宽

满足对地物或深空目标的中等分辨率的中远红外光谱探测需求。

Abstract

An Offner imaging spectrometer based on Infrared Focal Plane Arrays(IR FPAs) operated in two common-path diffraction orders was proposed to extend the spectrometer wavelength coverage. The overlapped rays from the first order and the second order of convex grating could be naturally separated and simultaneously detected by the dual-band IR FPAs on the focal plane. The basic principles and design cautions were discussed in detail. Through geometrical ray tracing

the spectral smile and keystone were evaluated. Based on Huygens Point Spread Function(PSF)

the Spectral Response Function (SRF) was also simulated

from which the spectral bandpass was derived as well. The dual-band Offner imaging spectrometer covers the wavelength range of 3 to 6 μm in the second order and 6 to 12 μm in the first order with bandpasses of 13.2-14.3 nm and 28.3-33.3 nm respectively. The two diffraction orders have the same spectral smile and keystone characteristics by both within half of a pixel width. The grating efficiencies are not lower than 20% over the full wavelength ranges. For its compact construction and wide spectral coverage

the instrument is competent for the measurements of the earth surface or deep space objects in the middle- and long- wave infrared (MWIR/LWIR) regions with moderate resolutions.

关键词

Keywords

references

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