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The problem of the amount of light passing: the relative aperture determines the light transmission capability of the lens, and the relative aperture of the lens is f1. The lens light passing through the aperture is four times the relative aperture f2. The same camera, infrared light, respectively, with the above two lenses, infrared action distance can be doubled. The large-aperture lens is four to ten times better than an ordinary lens in infrared monitoring, and it should be said that it should be a necessary accessory for infrared night vision monitoring. However, due to high costs and 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, imaging focus is not on a plane, resulting in clear images in the daytime visible light conditions, and nighttime infrared light conditions blurred, or nighttime infrared light conditions, clear images, daytime visible light conditions The image is blurred. It can be solved in three ways. First, the use of autofocus 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 without offset.
Color problem: All black and white cameras are infrared sensors. Infrared light is a stray light for a color camera under visible light conditions, which will degrade the sharpness and color reproduction of the color camera. The filter of the color camera is to prevent infrared rays from participating in imaging. There are two ways to make the color camera sense infrared light. First, switch the filter to block the infrared light from entering under visible light; remove the filter under the condition of no visible light and let the infrared light enter. The image quality is good, but the cost is high and the switching mechanism will cause a certain failure rate. Second, opening a specific infrared channel on the filter allows infrared rays with the same wavelength as the IR lamp to come in. This method does not increase the cost, but the color reproduction is slightly worse.
How far can infrared cameras monitor? When technology arrives, an infrared night vision system over 100 meters is not that difficult. When technology arrives at home, it means that you must master infrared light technology, infrared sensor camera technology, and infrared sensor lens technology. All three 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.
The problem of angle: First of all, there is a waste of light when using a large-angle infrared lamp with a lens of a small viewing angle. Second, the larger the angle of emission of the infrared light, the better the picture.