More about motion detectors sensor

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More About Motion Detectors sensor

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• security motion detector is the where the entire
  home security system is activated. These are the
  "input" points for the entire system. They
  initiate the signals that result in the alert or
  the alarm being triggered. These sensors come in
  a variety of types and are based on various
  technologies. Quite frankly, choosing the
  appropriate sensors is a critical step in
  planning your home security system.

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• Magnetic

• Infrared

• These are the most common sensors in home
  security and are used as door and window alarms.
  The device is installed so that a circuit is
  created when the door or window is shut. When
  opened, the circuit is broken and the security
  system is triggered.

• Motion detectors are the second most common
  sensors in home security systems and infrared
  sensors are the most frequently used. Sometimes
  called PIR (passive infrared) sensors, they are
  able to detect radiated body heat. The cheapness
  and reliability of this sensor has made it
  standard in most security systems.

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• Dual Tech

• Shock (or Glass Break)

• One of the challenges in motion detectors comes
  from household pets. How do these sensors
  discriminate between the movement of a person and
  that of a dog or cat? Dual tech sensors combine
  the infrared with microwave technology (below)
  and are better able to be set to ignore animal
  movements.

• More commonly known as glass break sensors, these
  actually detect the shock wave created from
  breaking a window. These devices are also known
  as "acoustic" or "sound" detectors. Often they
  are used as a redundant monitor for the magnetic
  sensors mentioned above.

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• Microwave

• Ultrasonic

• These sensors emit microwave energy to detect
  movement. Some properties of microwave energy do
  not make it suitable for most home applications.
  Most commonly it is found as an automatic door
  sensor as you have seen in many businesses.

• These sensors are either active (emitting high
  frequency sound) or passive (detecting sounds).
  These sensors are among the most sensitive and
  therefore among the most expensive. They are not
  used in typical residential applications.

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