摘要
超光谱成像是一种场景图谱合一的技术,在战场侦察中得到了迅速应用。超光谱成像系统的标定是确定其输出准确数值的过程。分析了一种基于背照减薄CCD和凹面光栅成像光谱部件的UV/Vis/NIR超光谱军用探测系统,其光谱分辨力为3.3 nm;探讨了0.25-1.1μm工作波段内超光谱成像系统的标定和评估方法,详细介绍了以带有测试靶均匀辐射源为对象的空间成像质量评估、以激光和Hg灯为基础的光谱质量评估以及利用高精度标准辐射源的辐射性能标定。在经过多步辐射校正和光谱真实性检测验证后,最终获得的景物反射率光谱曲线真实反映了光谱特性,满足了0.2 mrad的空间分辨力和±0.5%色散线性率的精度要求并在军用探测系统中进行了反伪装的成功应用。
As an image-spectrum merging technology,hyperspectral imaging has been used in battlefield reconnaissance rapidly.The calibration of hyperspectral imager is a process that corrects itself's output.An UV/Vis/NIR hyperspectral military detection system based on BTCCD and concave grating parts is analyzed,and it's spectral resolution is 3.3 nm.Some calibration and evaluation methods are discussed for hyperspectral imaging system which operates at 0.25-1.1 mm waveband.Image quality assessment based on an uniform radiation source with target,spectral quality assessment based on laser and Hg lamp,and radiation performance calibration based on high accuracy standard are researched detailedly.After several steps of radiation calibration and spectral fidelity verification,the reflective curve which represents the objective spectral character was obtained,satisfying the requirement of 0.2 mrad spatial resolution and ±0.5% dispersive linearity.Finally,satisfactory results were obtained with these methods in a military detection system.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2007年第9期1676-1679,共4页
Spectroscopy and Spectral Analysis
基金
国家电子技术支撑项目(E0202051)资助
关键词
超光谱成像
探测系统
图谱标定
Hyperspectral imager
Detection system
Performance calibration