The simulation of natural low level light under lab’s condition

Abstract

Considering the needs of glimmer night vision system experiment, this paper has analyzed the working environment of glimmer night vision system, and based on this analysis the paper adopted double integrating sphere and collimator to simulate natural shimmer environment under the laboratory condition. By further analysis, we can conclude that as long as the field of collimator is larger than the field of night vision system , the natural micro light of night vision system testing can be simulated under the laboratory conditions, And the feasibility of this method is verified by experiment .Key words: night vision system, The light stress, collimator, environment simulation of natural, field of view CLC Number：TG156 IntroductionDue to the LLL night vision system can be in very low illumination conditions (10 -1 ～10 -4 lx) 1 in passive way under the starlight night work, light night system become the focus of night vision technology development after infrared night-vision goggles. And its get rapid development and wide application in military. LLL sight is equipped with night vision on light weapons aiming equipment, which makes use of the "night light" of nature. Its can in certain range effectively aim, thus become a fighting soldier's powerful magic weapon. Light sights as an important part of the individual weapon system, its performance is a major concern. And As mechanical and electrical products, the key to the reliability index of average trouble-free working hours MTBF LLL night vision system is an important technical index of assessment [1] .Image intensifier is the core component of LLL sight, which weak light increase enough to cause the intensity of illumination of human eye vision, so that people with the naked eye to observe the device. In other mechanical and optical structure under the condition of high reliability, micro lens of MTBF depends mainly on the MTBF of image intensifier, and the greatest influence to image intensifier is light stress. Under the condition of without considering other stress, MTBF and the light which photoelectric cathode surface receives is an inverse relationship.[2]The effect of light stress on LLL sight is very large and the night light is a major source of LLL night vision system to obtain the target information. When the LLL night vision system performance parameters of the test, we must maximize the simulating natural light environment. It is of great importance for the assessment of the actual performance of the LLL night vision system parameters.

Experimental study on the probabilities of kinked arches and kinked arch locations in ore passes under the influences of multiple factors

“…Bonding generally refers to the bonding force. The natural angle of repose of bonded particles is consistent with the angle of internal friction 31 . The repose angle can qualitatively represent the mobility of the material; the smaller the repose angle, the better the mobility and the weaker the bonding 32 .…”