Range Test Technology Research of Visible-light CCD Based on Complex Background

Abstract

Abstract:With the application of the photoelectric detection equipments based on visible-light CCD is more and more widely, function distance plays an important role in the combat mission. As a key performance, function range is an important test item in the evaluation test. In this paper, on basis of testing and analysis of optical reflection characteristics about typical background such as green vegetation, the sand and so on, reasonable test scheme designed in this paper had been applied to function range test of a certain type of equipment and had evaluated function range of visible-light CCD device scientifically and comprehensively. IntroductionAt present, various vehicle-mounted, ship-borne, airborne, individual weapon and other weapon equipments are all equipped with photoelectric detection equipments. The photoelectric detection equipments can be divided into visible light device and night vision device according to two kinds of aiming pattern.CCD device is widely adopted in visible light aiming pattern. Its spectral range can extend to near infrared wave band. As the critical performance of visible light device, function range must be checked in the qualification test. It is very important when evaluating operational effectiveness of photoelectric detection equipments.As an important property, there is a lot of related research about function range. One method is to evaluate CCD function range with theoretical analysis and calculation of characteristic parameters such as target signal, background signal, detector noise and so on [1][2][3] . Another approach is to establish the function range model of visible light photoelectric imaging system, according to target properties, background properties, atmospheric transmission effect, transfer characteristic, human visual system of photoelectric imaging system and other various factors. Then, the model will be evaluated by mathematical simulation [4] . On basis of testing and analysis of optical reflection characteristics about typical background such as green vegetation, the sand and so on, reasonable test scheme designed in this paper had been applied to function range test of a certain type of equipment and had evaluated function range of visible-light CCD device scientifically and comprehensively. Optical reflection characteristics of typical backgroundOptical reflective characteristics of target and background have significant influence to function range of visible-light CCD devices. All kinds of invisibility weapon and equipments are based on this theory. The woods, sand, grassland and desert are all typical background which military targets may be located. For photoelectric detection equipments, the background will have an effect on observing and aiming the target. Among the background above, the woods and the grassland are the most common.Characteristics spectrum of the targets is a kind of expression that caused by the interaction between electromagnetic radiation and surface features. Its main performance involved with visible light and near infra...