What is a Microwave Sensor?

What is a Microwave Sensor?

• A. A Passive Infrared Sensor
• B. Dual (Bistatic) Or Single (Monostatic) Radio Energy Sensor Used to Detect Penetration, Protected by a Tamper Switch
• C. A Camera-Based Motion Detector
• D. A Magnetic Field Detector

Answer: (B)

Microwave sensors in alarm systems detect movement by using microwave radio energy. They emit microwave signals and listen for reflections that change when something moves in the area, typically using the Doppler effect to identify motion. The system can be configured as monostatic, where the transmitter and receiver are in the same device, or bistatic, with separate transmitter and receiver units. A tamper switch is commonly included to detect if the sensor is opened or disabled, adding protection against tampering. This approach allows detection through barriers like walls and offers operation that isn’t dependent on lighting, which is different from infrared or camera-based methods, and it isn’t based on magnetic field changes like a magnetic detector.

Microwave sensors in alarm systems detect movement by using microwave radio energy. They emit microwave signals and listen for reflections that change when something moves in the area, typically using the Doppler effect to identify motion. The system can be configured as monostatic, where the transmitter and receiver are in the same device, or bistatic, with separate transmitter and receiver units. A tamper switch is commonly included to detect if the sensor is opened or disabled, adding protection against tampering. This approach allows detection through barriers like walls and offers operation that isn’t dependent on lighting, which is different from infrared or camera-based methods, and it isn’t based on magnetic field changes like a magnetic detector.