基于AOTF的多光谱红外成像系统MRTD测试技术研究

MRTD in multi-spectral infrared imaging system based on AOTF

为了实现红外多光谱成像系统光谱维MRTD测试,获取更多的目标背景信息,提出基于声光可调谐滤波器(AOTF)的多光谱成像系统静态性能测试平台的设计。在(3~5)μm波段范围内,采用设计搭建的静态性能测试平台完成了红外带内波段的细分,并在各个细分波段上分别对空间频率2.546lp/mm、1.273lp/mm、0.849lp/mm和0.632lp/mm的标准靶进行了MRTD测试。实验结果表明,得到的光谱维MRTD测试结果与理论结果一致,验证了测试平台的可靠性和测试方法的可行性。

In order to achieve the spectral minimum resolvable temperature difference(MRTD)testing of infrared multi-spectral imaging and obtain more information of target and background,an acousto-optic tunable filter(AOTF)-based multi-spectral static performance testing platform was designed and developed.At 3μm^5μm waveband,through adopting the designed optical testing platform,the subdivision of band was carried out in middle-wave infrared region,and the MRTD tests were finished in targets with different spatial frequencies of 2.546lp/mm,1.273lp/mm,0.849lp/mm and 0.632lp/mm,respectively.The experimental result shows that,the test results of spectral MRTD correspond with the theoretic analysis,verifying the reliability of the optical testing platform and the feasibility of the testing method.