How Does Night Vision

How Does Night Vision HOW IT WORKS Night Vision Author - CJ Boedeker - The Night Vision Store and The Opticstore During the history of the war, operations at night have always been degraded significantly, if not avoided altogether. Usually, the fight against the soldiers during the night had to resort to artificial lighting, for example, at first and then fire with light sources such as projectors. The use of light sources on the battlefield proved to be harmful to give information on the positions and tactical maneuvers. The advent of new technologies, first in 1950 and continues in the present, the situation has changed. Engineers and scientists at the Night Vision and Electronic Sensors Directorate (NVESD) have found a way to capture the electromagnetic radiation available outside the spectrum visible to the human eye and have been developed to allow the team to fight American soldiers, and during the night days of "Own the Night." The intensification of the image intensifier to capture images in ambient light and amplify it thousands of times by electronic means to display the battlefield to a soldier via a phosphor display such as night vision goggles. This light comes from stars, the moon or the sky glow from distant sources, like the city. A soldier can conduct his combat missions without any active illumination sources using only image intensifiers. The main advantages of image intensifiers as night vision devices of their small size, light weight, low power and low cost requirements. These attributes have enabled image intensifier goggles to remove the head, the soldiers and led to hundreds of thousands of applications for night vision goggles to be procured by the U. S. Army. Research and development continues today on the image intensifier in the areas of greatest wavelength spectrum of response, greater sensitivity, larger field of view, higher resolution, advanced displays and image fusion. Technology for night vision consists of two main types: image intensification (light amplification) and thermal imaging (infrared). Most consumers of the products of light amplifying night vision devices. Light amplification technology takes the small amount of light as the moon or the stars, ie the surrounding area, and converts the light energy (scientists call it photons) into electrical energy (electrons). These electrons pass through a thin disk about the size of a quarter and contains over 10 million channels. As the electrons travel through and strike the walls of the channels, thousands of electrons are released. These multiplied electrons then bounce off of a phosphor screen that converts the electrons back into photons and lets you see an impressive sight at night, even when it is really dark. Image intensification night vision of all the products in the market today have one thing in common: a green image output. In the night vision world there are generations that reflect the level of technology used. Higher the generation, the most sophisticated night vision technology. Generation 0 - The first (1950) were the products of night-vision-based image conversion, rather than intensification. They require a source of invisible infrared (IR) light mounted on or near the device to illuminate the area. Generation 1 - The "star power" of 1960 (Vietnam Era) have three image intensifier tubes connected in series. These systems are larger and heavier than Gen 2 and Gen 3. 1 The overall picture is clear in the center, but may be distorted around the edges. (Low-cost Gen 1 imports are often mislabeled as a higher generation. Generation 2 - The microchannel plate (MCP) electron multiplier prompted Gen 2 development in 1970. The "gain" from MCP eliminated the need for back-to-back tubes - thereby improving size and image quality. The mechanism has enabled the development of handheld and helmet-mounted goggles. Generation 3 - Two major advances in the field of development is characterized by Gen 3 in the years 1970 and in early 1980: the gallium arsenide (GaAs) photocathode and the ion-barrier film on the MCP. The GaAs photocathode enabled detection of objects based on distances much greater low light conditions. The ion barrier film increased the operational life of the tube from 2000 hours (Gen 2) to 10,000 (Gen 3) as demonstrated by actual testing and not extrapolation. Thermal Imaging: Most objects in natural scenes as well as human beings and artificial objects emit radiation electromagnetic interference in the form of heat. Thermal or infrared viewers (also known as FLIRs) to collect the infrared radiation and the electronic image of the soldier. Why are not dependent on the reflected light, thermal images are completely independent in terms of light. There are also significant penetration capabilities through obscurants such as fog, mist, smoke and conventional battle. There are two varieties of thermal imaging systems: cool and uncool. cooled thermal imaging requires cryogenic cooling. uncool Slow performance thermal systems do not require imaging detector cooling, but it is sufficient to provide low to medium performance requirements of the different places of soldiers, infantry vehicles, navigation, robotics and seeking missiles. Present research and development in pursuit cooling thermal imaging multi-spectral imaging, improved sensitivity and resolution, and signal processing integrated to help the soldiers in missions targeting. uncool current research is aimed at small package size and power consumption at a lower cost and greater sensitivity, resolution and field of view. Pequeño the size of the palm of thermal imaging now available uncool.