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由于一些可见光折衍射混合光学系统结构复杂,光学材料种类繁多且光热性能差异大,不能像红外系统那样通过解消色差、消热差方程组得到初始结构。通过分析衍射光学元件的温度特性,采取使用衍射光学元件先消色差再消热差的方法,完成了可见光波段遥感物镜的消热差设计。系统在20℃-10℃范围内成像质量均保持良好,调制传递函数下降范围在6％之内。设计结果表明利用衍射光学元件的混合光学设计使系统结构简单化,并在要求的温度范围内性能稳定。
Due to the complex structure of some visible light diffraction and diffraction hybrid optical systems, the wide variety of optical materials and the large differences in the optical and thermal properties, the initial structures can not be obtained by eliminating the color difference and eliminating the thermal difference equations like the infrared system. By analyzing the temperature characteristics of the diffractive optical element and taking the first achromatic and then the thermal difference of the diffractive optical element, the design of the extinction difference of the remote sensing objective in the visible wavelength band is completed. The system maintains good image quality at 20 ℃ -10 ℃, and the modulation transfer function falls within 6%. The design results show that the hybrid optical design using diffractive optics simplifies the system structure and provides stable performance over the required temperature range.