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Radar and Light Based Motion Detector Systems
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- Pet Sensitive Motion Detector
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A radar-based motion detector system is relatively common and uses simple technology. It’s the system, for example, that's used in automatic door openers. This type of motion detector emits bursts of ultrasonic sound waves or microwave radio energy. It waits for a specific pattern of reflected energy bouncing back to it. Anyone moving around in the area disturbs the waves and sends back an altered pattern. The sensor then sends a signal to the alarm, which begins to sound.
When you use an photo-sensor motion detector you are basically aiming a beam of light at a sensor. When an intruder walks through the path of the light beam, the sensor receiving the data registers a decrease in the light level and alerts the control box, which then sounds the alarm.
Passive infrared motion detectors can detect the heat emitted from the burglar’s body. During a marking increase in infrared energy, the alarm is triggered. Multiple motion detector systems can be used in combination to protect a householder’s premises.
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