中波红外多光谱成像技术研究

The Study of MWIR Multispectral Imaging Technology

多光谱成像技术结合成像和光谱测量技术,同时探测目标的光谱和几何特征,在目标识别和抑制背景杂波方面具有技术优势。研制了一套工作于中波红外波段的四通道多光谱成像系统。利用窄带滤光片和面阵探测器技术,构建了基于时序扫描的凝视成像型红外多光谱成像系统。根据红外探测器性能参数,对各个光谱通道的温度灵敏度进行了估算。在系统设计时通过合理地滤光片布局,尽量延长各个光谱通道的信号积分时间,以提高各个光谱通道温度灵敏度。利用研制的中波多光谱成像系统,对室外进行了成像,并对各个通道的成像结果进行了比较分析。

Multispectral imaging technology integrating spectral measuring with imaging technology, can detect the spectral and geometric characteristic of target simultaneously. The multispectral imaging has technical advantage in restraining the clutter backgrounds and identifying target. A multispectral imaging system with four channels working in Mid-wave Infrared （MWIR） band has been developed. Using the narrow optical filter and the infrared Focal Plane Array （FPA）, the staring multispectral imaging system can work based on time sequence sweeping. According to the detector performance, the temperature sensitivity of each channel has been analyzed. For improving the sensitivity of each spectral channels,optical filters were schemed carefully to extend the integral time of the detector. Using the developed MWIR multispectral imaging system, the imaging test has been carried out, and the results of each channel have been compared.