Monday, February 28, 2011
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Sunday, February 27, 2011
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Saturday, February 26, 2011
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Friday, February 25, 2011
Thursday, February 24, 2011
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Wednesday, February 23, 2011
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Tuesday, February 22, 2011
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Monday, February 21, 2011
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Sunday, February 20, 2011
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Saturday, February 19, 2011
Friday, February 18, 2011
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Thursday, February 17, 2011
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Wednesday, February 16, 2011
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Tuesday, February 15, 2011
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Monday, February 14, 2011
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Saturday, February 12, 2011
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Friday, February 11, 2011
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Thursday, February 10, 2011
Wednesday, February 9, 2011
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Tuesday, February 8, 2011
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Monday, February 7, 2011
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Sunday, February 6, 2011
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Saturday, February 5, 2011
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Friday, February 4, 2011
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Thursday, February 3, 2011
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Wednesday, February 2, 2011
Wireless Motion Detector Types - Ultrasonic, IR, PIR, Continuous Wave Radar and Vibration
There are many uses for a wireless motion detector. Recently, they have become increasingly popular in public restrooms where the toilets, soap dispensers, and faucets are automated. They are also very popular and more useful as security devices which can be connected to bigger security systems. A motion detector can trigger a warning signal, such as an alarm, flashing lights, or a surveillance camera every time it detects movement.
Types of Motion Detectors
You should first be aware of the various types of wireless detectors before purchasing a model. This will help you understand what type of detector is best for your use.
• Ultrasonic Detectors - These motion detectors send out waves of sound frequency that detect the presence of objects. These are older models and have been replaced by more advanced sensors.
• Active Infrared (IR) Detectors - These devices continuously emit radiation, such as light, radar, or ultrasonic waves and senses changes in the environment caused by a passing object. IR detectors are often found in automatic doors used in malls and grocery stores.
• Passive Infrared (PIR) Detectors - Just like IR detectors, PIR devices sense changes in its environment, but they do not emit radiation. Instead, they detect changes in the temperature of objects and people that are within their range of surveillance. They are the ones used mostly for home and office security.
• Continuous Wave Radar (CW) Detectors - Instead of infrared radiation, CW detectors use microwave signals to detect changes in the frequencies in its environments. They are more sensitive than both IR and PIR detectors and are naturally more expensive.
• Vibration Detectors - These devices work according to the principle of piezoelectric effect by French scientists Jacques and Pierre Curie, which basically means that objects generate their own electrical fields.
Combination Type Wireless Motion Detector
The biggest problem people had with motion detectors is the number of false alarms that usually go off because of a passing pet or a curtain blowing in the wind. Manufacturers have made up for this problem by combining active and passive infrared technologies in one model. These dual-technology sensors emit microwave signals that continuously bounce off objects inside the room until they start to form a blueprint of the fixed objects inside the room. When the blueprint of objects changes, such as when motion takes place, the sensor then uses infrared radiation to access the temperature signature of the new objects and determine if a human intruder is present.
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Tuesday, February 1, 2011
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