Types of Motion Detection Sensors


 1.) Passive Infrared (PIR) Sensors:

  • Detect heat signatures from humans or animals and respond to changes in infrared energy.
  • Commonly used for automatic lighting and security alarms.
  • Work well indoors and are energy-efficient.

2.) Ultrasonic Sensors:

  • Emit ultrasonic waves and detect motion by analyzing the frequency shift caused by moving objects.
  • Sensitive to even minor movements but can be prone to false alarms.

3.) Microwave Sensors:

  • Use microwave signals to detect motion based on Doppler shifts.
  • Have a wider range than PIR sensors but may detect movement through walls, leading to unintended activations.

4.) Dual Technology Sensors:

  • Combine PIR and microwave or ultrasonic technologies to reduce false alarms by cross-verifying motion detection.


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