| 宽幅长波红外高光谱扫描成像系统的设计 |
| 投稿时间：2018-03-21 修订日期：2018-03-26 点此下载全文 |
| 引用本文：赵航斌,柴孟阳,孙德新,刘银年.宽幅长波红外高光谱扫描成像系统的设计[J].红外,2018,39(6):1~7 |
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| 基金项目:国家重点研发计划（2016YFB0500400）；国家高分辨率对地观测系统重大专项（A0106/1112） |
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| 中文摘要:为了满足宽幅长波红外高光谱成像需求，基于光导型碲镉汞线列探测器和平面闪耀光栅，提出了一种在长波红外8~12.5 μm范围内具有150个连续波段、30°成像视场角、基于地面应用的低成本、轻小型高光谱扫描成像系统的设计方法。该系统由光栅扫描机构和视场扫描机构组成，两机构同步控制以实现精细分光和宽幅成像功能。推导了光栅扫描角度与探测器接收单色光的波长、视场扫描角度与成像视场角间的关系式。在分析扫描系统扫描定位精度的基础上，设计了一套以步进电机为运动核心，采用“摆扫定位+停止成像”工作模式的扫描系统。实验表明，该扫描系统可满足系统视场定位精度及分光精度的要求。获取的硅碳棒在长波红外波段的发射光谱曲线表明该系统的设计合理有效。该扫描系统的设计方法对长波红外高光谱系统的设计具有一定的指导意义。 |
| 中文关键词:高光谱成像系统 长波红外 线列探测器 扫描系统 |
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| Design of Wide Swath and Long Wave Infrared Hyperspectral Scanning System |
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| Abstract:To meet the demand of wide-swath and long-wave infrared hyperspectral imaging, a new design method of low-cost, light and miniature hyperspectral scanning imaging system for ground imaging is proposed on the basis of photoconductive HgCdTe linear detectors and plane blazed rasters. The system has 150 continuous spectral segments and a 30° imaging field angle in the 8~12.5 μm long-wave infrared range. It consists of a raster scanning mechanism and a field-of-view scanning mechanism, both of which are controlled synchronously to achieve fine light splitting and wide-swath imaging. The relations both between the angle of raster scanning and the detector received monochromatic wavelength and between the field-of-view scanning angle and the imaging field angle are deduced. On the basis of analyzing scanning positioning accuracy, a scanning system which uses a stepper motor as the core of motion and uses an operating mode of `whisk positioning+stop imaging'' is designed. The experimental result shows that the scanning system can meet the requirements of field of view positioning accuracy and light splitting accuracy. In addition, the silicon carbon emission spectrum curve obtained in the long wave infrared range shows that the design of the system is reasonable and effective. The design method of this scanning system is of guiding significance to the design of long-wave infrared hyperspectral systems. |
| keywords:hyperspectral imaging system long-wave infrared linear detector scanning system |
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