摘要
为了有效提高系统在红外的探测与识别能力,实现红外双波段光学系统消像差和消热差,采用具有负色散性能的双层谐衍射元件,设计了一款双层谐衍射/折射混合红外双波段消热差光学系统。基于红外光学系统消热差理论分析了温度对光学参数和系统性能的影响,利用Zemax仿真分析了光学系统在-60~200℃温度范围下的像质。研究结果表明:在尼奎斯特频率为20lp·mm-1与探测器的像元尺寸为25μm的条件下,中波波段的光学调制传递函数均大于0.5,长波波段的光学调制传递函数均大于0.25,中波与长波处的最大弥散斑尺寸均小于25μm,同时系统适应的温度环境范围大。系统具有像质高、分辨率高及工作温度范围大的特点。
In order improve the infrared detection and recognition capabilities and realize the achromatism and athermalization difference of the infrared dual band optical system,a dual layer harmonic diffraction/refraction hybrid infrared dual band athermal difference optical system is designed by using the double layer harmonic diffraction elements with negative dispersion.The effect of temperature on optical parameters and performances is analyzed based on thermal dissipation theory of infrared optical system,and the image quality of the optical system at the temperature ranging-60~200℃is analyzed by Zemax simulation.The results show that when the Nyquist frequency is 20 lp·mm-1 and the pixel size of the detector is 25μm,the optical modulation transfer function of the medium wave band is greater than 0.5,the optical modulation transfer function of the long wave band is greater than 0.25,and the maximum speckle size of the medium wave and long wave is less than 25μm.The system can work within a large temperature range.It is concluded that the system is characterized by high image quality,high resolution and wide temperature range.
作者
杨曼曼
冯斌
史元元
胥磊
YANG Manman;FENG Bin;SHI Yuanyuan;XU Lei(School of Optoelectronic Engineering,Xi’an Technological University,Xi’an 710021,China)
出处
《西安工业大学学报》
CAS
2020年第2期153-159,193,共8页
Journal of Xi’an Technological University
关键词
光学系统
双波段
双层谐衍射
消热差
optical system
dual band
double layer harmonic diffraction
athermalization
