As the name implies, night vision security cameras are used to capture images
in darker environments. There are day/night vision cameras that allow you to see
intruders trying to enter your home day or night time. These cameras ensure
better security to your property.
Most night vision security cameras have infrared LED. Cameras using thermal
imaging technique capture the heat emitted by objects to reveal them to the
viewer. All humans emit some heat in the form of infrared light. The infrared
detectors of the cameras pick these lights and a comprehensive temperature
pattern is generated as a thermogram. This thermogram is converted to electrical
impulses and a signal processing unit translates these signals into a display.
Night vision security cameras using light enhancement involves converting small
amounts of light into electrical energy. These electrical signals are amplified
and then converted to light and displayed.
The range of night vision security cameras vary considerably. Most small
outdoor night cameras cover 7 - 15 meters, whereas most professional security
systems cover up to 30 meters. The power of night vision security cameras are
represented in Lux rating. Lux rating is the minimum illumination in which a
camera can pick up an image. The closer the Lux rating is to 0, the better the
camera's performance in low light situations.
Like regular security cameras, night vision security cameras are also capable
of sending images to VCR, PC or to a distant destination through the Internet.
These images can also be recorded in tape, hard drive or any other storing
device. The day/night cameras will have extra sensitive imaging chips which
allow them to capture in light situations without using infrared LED. During
daytime, they provide color images and during nighttime they provide black and
white or green phosphor shades.
Modern night vision security cameras can be used both as indoor and outdoor
units. They are provided with weatherproof and waterproof casings made of
metals. Most have triggering alarms or lightings which start automatically on
seeing any moving object. Many night vision security cameras also have
microphones to pick up sounds. A lot of cameras have remote controlling
facilities. The price range starts from $80.
