Xu Qiang, Jin Wei-Qi, Fu Lian-Qiu
Department of Optical-Electrical Engineering, Beijing University of Technology, Beijing 100081, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Sep;27(9):1676-9.
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.
作为一种图像光谱融合技术，高光谱成像已迅速应用于战场侦察。高光谱成像仪的校准是一个校正其自身输出的过程。分析了一种基于背照式电荷耦合器件（BTCCD）和凹面光栅部件的紫外/可见/近红外高光谱军事探测系统，其光谱分辨率为3.3纳米。讨论了工作在0.25 - 1.1毫米波段的高光谱成像系统的一些校准和评估方法。详细研究了基于带靶均匀辐射源的图像质量评估、基于激光和汞灯的光谱质量评估以及基于高精度标准的辐射性能校准。经过几步辐射校准和光谱保真度验证，获得了代表目标光谱特征的反射曲线，满足了0.2毫弧度空间分辨率和±0.5%色散线性度的要求。最后，这些方法在军事探测系统中取得了满意的结果。
