摘要
在可见近红外(VNIR)波段,信噪比及焦面稳定性是高光谱成像系统的重要性能指标,其中电荷耦合器件(CCD)探测器的合理选型是提高高光谱系统的信噪比及焦面稳定性的重要环节。提出了一种基于CCD像元规模、帧频和像元尺寸三个参数的快速选取符合要求CCD的方法,根据VNIR波段信噪比公式,建立了信噪比与焦深两个模型,根据工程应用系统分析,阐述了选型过程,着重阐述了像元尺寸选型(信噪比选型)的计算,对选型结果进行信噪比和焦深分析,验证了模型建立与选型方法的合理性。结果表明,提出的CCD选型方法可以高效准确地选取符合高光谱成像仪要求的CCD探测器。
Signal-to-noise ratio （SNR） and stability of focal plane are important performance index for airborne hyperspectral imaging systems in visible near infrared （VNIR） band. To fulfill the requirement, the rational selection of charge coupled device （CCD） detectors turns to be a key issue. A rapid method is proposed for choosing compatible CCD based on the scale, pixel size and frame rates of CCD. According to SNR formula of hyperspectral imager in VNIR band, a SNR model and a focal depth model are built. With analysis of a real project application, the selection process is proposed and the calculation when choosing the pixel size （or SNR） of the CCD is particularly elaborated. SNR and focal depth analysis of the selected one is also presented, proving that the models and the method of choosing CCD are rational. Results show that an efficient and accurate means of selecting CCD detectors is proposed for airborne hyperspectral imager.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第10期85-90,共6页
Acta Optica Sinica
基金
高分专项民用航空项目(30H33D01900613/15)
关键词
成像系统
高光谱成像
可见近红外
面阵电荷耦合器件
信噪比
像元尺寸
imaging systems
hyperspectral imaging
visible near infrared
area array charge coupled device
signal-to-noise ratio
pixel size
