One of the main elements in video surveillance is the image, and this is made possible thanks to the light and its properties. As we know, our eyes distinguish things because they reflect light, but how to monitor when light is insufficient or conditions of complete darkness?
The spectrum visible, easily recognizable as the Rainbow
Across the electromagnetic spectrum, the human eye distinguishes only a very small fraction, the part that goes from 400 to 700 nanometers in wavelength.
Sir Frederick William Herschel discovered that the heat was stronger next to the Red of the spectrum and noted that there was no light, this named it “caloric rays” radiation, what today we know as radiation or infrared light.
Infrared light is invisible to the mammals, can cover long distances and does not bother anyone, but does not deter criminals. Now there are security cameras watched day and night, showing daytime color and night black and white images.
During the night, security cameras show us images in shades and white according to Growtheology.
Security cameras to allow us to see at night, “illuminate” the scenes with a large amount of infrared LEDs that are tailored close to the lens of the camera, these are always lit during night operation. Highlight is that to the find fixed infrared LEDs to a distance determined, everything is ahead or behind that distance, will be wrong.
With the lowest infrared cameras can see up to 15 meters in mode black and white. The professional and industrial use, up to 40 meters or more. If we need to see greater distances there are different techniques to do so, for example, adding infrared lamps around the environment to be monitored.
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