One of the blessings of modern life is an automatic garage door. Instead of having to get out of your car to manually open or close your door, you can accomplish this action by simply pushing a button. However, as the door opens/closes without any hands to guide it, it is important that there is something that keeps the garage door from closing on top of any person or thing. For this reason, your garage door is equipped with a motion sensor. This sensor stops the door from closing when there is something in its path.
So just how does it work? Most garage doors have what is called an active sensor. An active motion sensor is one that works through ultrasonic sound waves. When the garage door opener is activated, the sensor sends out bursts of ultrasonic sounds waves that travel along a specific pattern. The sensor then waits for those waves to return. If nothing is in the way of the pattern, then the waves will return quickly and the door movement will be activated. However, if the pattern of the waves is disturbed, then the sensor triggers the door to stop.
The pattern of the wave can be disturbed by a car, a person, or any other object that gets in its way. Most garage doors have the sensors located at a specific point of the door (usually on the sides, near the bottom). The low placement of the sensor helps the sensor catch a wider variety of movement.
A garage door motion sensor is an important part of the safety features of your door. It not only helps protect your property (i.e. you can rest assured that your door will not close on top of your car, potentially ruining the paint job or causing other damage), but it helps protect the people who are coming in and out of your home. If your automatic garage door does not currently have a motion sensor, talk to your professional garage door installer to make sure that this important feature is installed.