What is a night vision camera?

Night vision camera or night vision is optical technology that allows observation and photo in extremely weak or light conditions. These cameras are commonly used between military, police and other security forces, but civilians use night vision for recreation and observation of wild animals. Night vision is categorized into gene-I, Gen-II, Gen-III and gen-III-III technologies depending on their sophistication. The latest, Gen-III Omni-VII, was developed in October 2007. Although these generational designations are determined by the US Army, it was accepted by a civilian night cameras community due to comfort.

There are two primary technologies used for night vision camera. The first and most common is a photomultiplious tube or a "conventional night vision" that works in the range of close infrared, picking light waves about 1 micrometer wide (human vision can only see light with frequency between 0.4 and 0.7 mIkrometers). The second is the thermal display that allows a night vision camera that can be photographed even when the light is missing. This is because thermal cameras can see electromagnetic radiation released by black heat, which is based on each physical object. Night vision camera types use a mixture of both technologies.

Although the first night vision devices, voluminous gadgets invented for snipers during World War II, only multiplied by the surrounding light, a modern night vision camera multiplies about 10,000-50,000 x. This is enough to take a minimum of star light, even if the moon is missing or covering. One disadvantage of most night vision systems is that the field of view is relatively narrow - you don't see your peripheral vision and your head and device must be turned to scan the area. Panoramic cameras for night vision of the sameThey are developing an American Air Force, but remain in limited use.

The basic principle of the operation of the Night vision camera is the capture of incoming photons, converting to electrons using a very thin layer of Gallium arsenide used as a photodiode, electrons are accelerated and their energy increases, affecting another layer and causing secondary cascade. The secondary emission cascade of electrons is then accelerated only to affect the phosphor screen and cause the emissions of the reinforced light that the user perceives. This light is monochrome and usually depicts as green, because the human eye is most sensitive to this wavelength.