Preparation and properties of a flexible night vision imaging system filter for avionic LED displays

摘要

A flexible near-infrared (MR) absorption filter well suited for use as a front surface filter for night vision imaging system (NVIS) LED displays was prepared by using a transparent polymer film and acrylic resin as substrate, NIR-dyes NIR787 and NIR860 as functional additives through the solvent mixing method. In particular, this new dye-based NVIS filter material offers sharp spectral cut-off and excellent extinction in the NIR (665-930 nm) along with an appropriate transmittance in the visible spectrum (400-700 nm). The optical performance of the filter was studied, the optimal dosage of NIR787 and NIR860 was determined and the results showed there was a good linear relationship between amount of NIR-dyes and light transmittance. In addition, the filter kept good environmental stability after cyclic humid heat test, high temperature aging test, low temperature aging test and photostability test.