Do Microwave Sensors Work Through Walls?
2022-08-04

The question often asked is: do microwave sensors work through walls? The answer depends on the material used in the building. Wood is an excellent material for microwave sensors. However, metallic objects like glass, walls, and metal doors do not allow them to penetrate. 

Instead, they create dead zones behind them that prevent motion detection. As a result, microwave sensors tend to cause more false alarms than passive infrared sensors. The problem with this is that you might not realize that a metallic object is blocking your view.

Microwave sensors are a great option for detecting motion, but they also work well in multiple environments. Microwave sensors work through walls because they can pass through plastic, glass, and even thin walls. This makes them an ideal choice for buildings with open spaces.

If you want to know if microwave sensors work through walls, continue reading this article. 

Do Microwave Sensors Work Through Walls?

Yes, microwave sensors can work through walls. If you want a sensitive detection range, microwave sensors are the way to go. But, if you want to minimize false alarms, you can use PIR sensors instead. Microwave sensors, on the other hand, can penetrate walls, meaning that they can detect changes in temperature from a distance.

Because they do not need to make direct contact with an object, microwave sensors are very versatile. In fact, they can work through walls and other non-metallic surfaces. And, because they have no moving parts, microwave sensors are reliable even for high-security applications. They can detect objects at distances ranging from 25mm to 45000mm. The exact range is dependent on the size and antenna and the microwaves available in the area.

While photo-electric sensors do not work through walls, microwave sensors do. These microwave sensors use continuous waves of microwave radiation to detect movement. They analyze these waves and look for a change in frequency when they reflect off an object. This frequency change triggers an alarm. While microwave sensors can detect movement through walls, they are more expensive than infrared sensors and may cause more false alarms because they can see through walls.

Microwave sensors operate very similar to sonar. They send out continuous microwave signals, which are then measured by the time it takes for them to bounce back. Movement disrupts this signal, and when the sensor detects movement, it automatically activates a light. Unlike PIRs, microwave sensors are less dependent on a line of sight and can be used even through thin walls and glass. 

A microwave sensor uses the Doppler effect to detect movement. It sends a microwave signal that is echoed back. The time it takes for the signal to reflect back causes a change in its echo time. A change in the echo time indicates the presence of an object. 

A person enters the field of view of a motion sensor, and the reflected microwave signals change. This change in time signals movement, which triggers the motion detector. Microwave sensors have the advantage of being cheaper and more accurate. They work at low and high temperatures.