Talk about the problem of monitoring accessories "infrared light" angle

September 27 23:08:09, 2023

[ Huaqiang Security Network News ] Is the infrared light the bigger the angle, the better? Whether manufacturers or engineers take it for granted, they believe that the larger the angle of view of the infrared light, the greater the room for the lens. The wide-angle lens does not have a "flashlight" phenomenon. Therefore, everyone is desperately saying how big the angle of view of their infrared lamps is. This seemingly plausible argument is actually very unscientific.
First of all, the use of large-angle infrared light with a small angle of view lens, there is a waste of light. For example, an infrared light, the angle of illumination is 80 degrees (equivalent to the angle of the f3.5mm lens), if combined with the f35mm lens, then there will be a considerable part of the light outside the field of view of the lens, that is, part of the infrared light wasted. In general, the angle of view of the infrared light should be consistent with the angle of view of the lens, and the effect is optimal. For example, the infrared light of Changchun Trent, the emission angle of the lamp is represented by the focal length of the lens. Its SK-4.2W-16 infrared lamp, the meaning is this: "-4.2W" means that the rated power of the lamp is 4.2 watts; "-16" means that the emission angle of the lamp is consistent with the lens angle of f16mm, both are Can be matched. The infrared lamps are classified according to angles, and currently include four series of "-4", "-8", "-16", and "-35", which can be matched with common lenses on the market.
Secondly, the larger the angle of emission of the infrared light, the better the picture will be. In some cases, if the angle of the infrared light is too large, it will affect the imaging. For example, the corridor, because of its "small and long" characteristics, if the emission angle of the infrared light is too large, the imaging of the near edge will be too bright, forming a "light curtain" phenomenon; the far center is invisible, only a white phenomenon. Therefore, the infrared light in the corridor should be one-half or one-third of the lens angle.
Third, you can use the "lighting" technology, two narrow-angle infrared lights to match and adjust the position, you can achieve the effect of wide-angle lights, the market's "night hawk" series infrared night vision system, is the use of "lighting" Technology has achieved both telephoto and wide angle. Under the same power conditions, the "lighting" technology can double the range of action.
In general, the problem of the angle of emission of infrared lamps is both a matter of choice and a matter of technology. For lenses with different focal lengths, the infrared light should be selected to match the emission angle. The emission angle of the infrared light should not be larger than the angle of view of the lens under any conditions. In narrow environments, it should be smaller than the lens angle. Even one-third of the infrared light. The narrow-angle infrared light can be combined to achieve an ideal wide-angle effect with better results and lower cost.
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