二元光学元件具有多种应用.用作透镜,在原理上色差非常大,若不在设计上做出补偿,则会限制其在宽波段上的使用.从理论上简单阐述了利用具有独特色散特性的二元光学元件的新型超光谱成像仪的基本原理和应用前景.在此超光谱成像仪中,二元光学透镜焦距随波长的变化改变了系统的F数,因此改变了系统的放大率,即系统放大率是波长的函数,这将引起光谱图像的像元配准误差,得到并不精确的相对光谱信号强度,从而限制了光谱图像重建算法的精度,为了补偿这一缺点,通过光学二组元法设计的变焦系统成功地解决了这一问题,并给出了理论设计公式.

Binary optical elements have many applications. One of the principal limitations of these lenses is abundant chromatic aberration that prohibits broadband use without design compensation. A novel configuration is presented that exploits this typically unwanted effect to create a hyperspectral imager. Diffractive lens′ focal length is inversely proportional to wavelength. The change in the focal length changes the F number of the system and therefore the magnification changes as a function of wavelength. The magnification is different for each wavelength in the recorded spectra, which creates image registration error, and provides inaccurate relative spectral signal strength. In result, the precision of object image reconstruction algorithms is restricted. To compensate for this shortcoming, the optical system with a zoom lens is designed by means of optical two component. The problem is solved successfully in theory. The theoretical formulas are provided.