Monday, October 26, 2009
nanny camera
Most of the time, the night-vision cameras are used for military services like surveillance and intelligence-gathering activities at night, or in conditions of low light or low visibility. A night vision device can be either a 1st, 2nd, 3rd or 4th generation unit.
This categorization of units is based on the light intensifier tube, which is basically the soul of such a night vision device. However, with the help of the image intensifiers, the video cameras are fitted together with Charged-Coupled Devices (CCDs). Most of the advanced night vision camera designs allow the image's light particles, called photons, to enter the CCD unobstructed. This facilitates high efficiency light detection through the ultraviolet wavelengths which are visible in nature.
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