Microwave sensor also called RF or Doppler sensor. As the name suggests, microwave sensors use continuous microwave radiation waves to detect movement. It emits high radio frequencies and measures the reflection of objects by sensing the frequency offset. Therefore, this type of sensor is more sensitive than many other sensors. If you know the periodic patterns, you can bypass their pulse periods. Microwave sensors are easy to install, provide high probability detection, low noise, and resistance to environmental changes. It can be used by Outdoor Lamps Manufacturers in Outdoor Lighting, and the specific applications include Floodlight With Microwave sensors.

　Microwave technology is sometimes called radar technology, and it is based on the Doppler effect. The principle of a microwave sensor is to continuously emit microwaves of a specified frequency in the detection area of ​​the sensor, and these microwaves are reflected back to the sensor by objects in the detection area. If the object is stationary, the frequency of the reflected microwaves is the same as the frequency of the emitted microwaves and will not be detected. Once there is a movement in the detection field, the reflected microwave will change the frequency so that the sensor can detect it. The technology of the microwave sensor can distinguish between approaching motion (higher frequency) and leaving motion (lower frequency), allowing the sensor to open the automatic door only in the approaching direction.

  What are the characteristics of microwave sensors? First, the first point is that microwave sensors use the Doppler effect to identify moving objects that use microwaves. It operates at the K-band frequency to maximize performance and reduce interference from external radar sources. The second is that the microwave sensor is an active sensor because it sends out microwave signals for detection. Like PIR sensors, microwave sensors can be used as occupancy sensors. But unlike other detectors, microwave sensors can be used in harsh environments with irregular thermal cycles. Microwave radiation easily penetrates walls and holes, so they can be used across borders and enclosed areas.