How far can an infrared camera monitor? With technology at home, an infrared night vision system above 100 meters is not difficult. When technology comes home, it means that you must be proficient in infrared light technology, infrared sensor camera technology, and infrared sensor lens technology at the same time. This article briefly lists the precautions for using infrared sensor cameras.
The problem of angle: First of all, using a large viewing angle infrared lamp with a small viewing angle lens, there is a waste of light. Secondly, it is not that the larger the emission angle of the infrared lamp, the better the picture effect.
The problem with the amount of light: the relative aperture determines the light transmission capacity of the lens. The lens with a relative aperture of f1. 0 has a light flux of four times the lens with a relative aperture of f2.0. The same camera and infrared lamp are matched with the above two lenses respectively, and the infrared action distance can be doubled. In terms of infrared monitoring, large-aperture lenses are four to ten times better than conventional ordinary lenses, and should logically become a necessary supporting product for infrared night vision monitoring. However, due to the high cost and technical difficulties, most infrared product manufacturers do not have the ability to supply.
Precautions for using infrared cameras
The problem of focus shift: due to the different wavelengths of visible light and infrared light, the imaging focus is not on a plane, resulting in clear images under visible light conditions during the day, and blurry under infrared light conditions at night, or clear images under infrared light conditions at night and visible light conditions during day The image is blurred. Can be solved in three ways. *, Using an autofocus integrated camera; second, using a dedicated focus non-offset lens; third, using a professional adjustment tool, which can also achieve no offset under existing lens conditions.
Color issues: All black and white cameras are infrared light sensitive. Infrared light is a kind of stray light for a color camera under visible light conditions, which will reduce the clarity and color reproduction of the color camera. The filter of the color camera is to prevent infrared from participating in imaging. There are two ways to make the color camera sense infrared. *, Switch the filter to block the infrared from entering under visible light; remove the filter to allow infrared to enter under no visible light. The image obtained by this scheme The quality is good, but the cost is high and switching mechanisms will cause a certain failure rate. Second, open a specific infrared channel on the filter to allow infrared light with the same wavelength as the infrared lamp to come in. This method does not increase the cost, but the color reproduction is slightly worse.
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