Glare in Optical Systems for Thermal Band Imaging

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Abstract
Glare is a well-known effect which reduces image contrast and creates false images in optical systems. It is a particularly serious problem in night-vision optics that use image-intensifiers, and this has led to an interest in the glare properties of thermal-imaging systems for night-vision applications. In this paper the causes of glare—multiple reflections, surface and bulk scattering from the optical components, reflections from the inside of the lens barrel and thermal emission from heated parts of the imaging system—are analysed and are shown not to be a significant limitation on the performance of present-day thermal-imaging systems operating at background levels comparable with those at the Earth's surface.

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