DESIGN OF AN OPTICAL SYSTEM OPERATING IN BOTH VISIBLE AND LONG-WAVE INFRARED SPECTRAL BANDS

Abstract

This article demonstrates how to select an appropriate combination of materials based on the requirement of simultaneously chromatic aberration reduction in two spectral bands: visible and long-wave infrared. Then proceed to design the optical system for the objective of the camera operating in both of the above mentioned spectral regions by using an aspherical/diffractive surface to improve the imaging performance of optical system. The designed optical system has a simple structure, consisting of only 3 elements, and high image quality, modulation transfer function (MTF) at Nyquist frequency is higher than 0.28. It is suitable for imaging system in unmanned aerial vehicle.