Abstract
Effects of wall type cold aperture for linear IRCCD array on aperture efficiency and modulation transfer function (MTF) are discussed. The narrow dynamic range of currently available linear IRCCD array makes the forward looking infrared camera (FLIR) frail to environmental thermal change. Preventing the detector element from being exposed to infrared emission from warm housing is the key technology for making full use of IRCCD's narrow dynamic range. Wall type cold aperture, witch is a successive barrier built between each detector element, is developed to block the infrared incidence across the neighboring aperture. The efficiency of the wall type aperture as a stop of warm housing emission is examined through experiment and computer simulation. It is shown that a very high efficiency is obtainable at the cost of a small amount of MTF reduction.
