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The problem of angles: First of all, the use of large-angle infrared light with a small viewing angle of the lens, there is a waste of light. Second, not the infrared light emission point of view, the better the picture.
The problem of the amount of light passing: the relative aperture determines the light transmission capability of the lens, and the relative light flux of the lens whose aperture is f1.0 is four times that of the lens of the relative aperture f2.0. The same camera and infrared lamp are used together with the above two types. Lens, infrared action distance can be doubled. Large-aperture lens in the infrared monitoring, than the regular ordinary lens is four to ten times better, it stands to reason that infrared night vision monitoring must be ancillary products. However, due to high costs, technical difficulties, Most infrared product manufacturers do not have the ability to supply.
Focus shift problem: visible light and infrared light due to different wavelengths, the imaging focus is not on a plane, resulting in clear images under visible light conditions during the day, and blurred under nighttime infrared light conditions, or clear images under nighttime infrared light conditions, daytime visible light conditions Under the image is blurred. It can be solved in three ways. First, the use of automatic focusing integrated camera; Second, the use of special focus does not shift the lens; Third, the use of professional adjustment tools, under the existing lens conditions can also be achieved Not offset.
Color problem: All black-and-white cameras are sensitive to infrared light. Infrared light is a stray light for color cameras under visible light conditions, which can reduce the resolution and color reproduction of color cameras. The filters of color cameras are blocking. Infrared imaging is involved. There are two methods for infrared sensing by color cameras. First, switch the filter and block the infrared light from entering under visible light; remove the filter without visible light and let the infrared light enter. The quality of the image obtained by this solution is good, but the cost is high and the switching mechanism will cause a certain failure rate. Second, a specific infrared channel is opened on the filter, allowing infrared rays with the same wavelength as the infrared lamp to come in. The method does not increase the cost, but the color reproduction is slightly worse.
Infrared camera can monitor how far? Technology home, more than 100 meters of infrared night vision system is not difficult. Technology home, refers to the need to simultaneously master infrared light technology, infrared sensor camera technology and infrared sensor lens technology, three Those are indispensable. Now the products on the market have been more than 500 meters away, but the cost is relatively high, and the civilian market is still relatively limited.
Talking about the use of infrared cameras
Infrared cameras are not only satisfied with the low indoor illumination, but also meet the requirements of international energy conservation. Based on these two points, they are widely used in indoor and outdoor environments. Then, in the actual use of the process, what are the precautions?