automatic door sensor how it works？
When you gone to supermarket,getting ready to leave the supermarket,your hands are full of bags.The automatic door is very important.It can help you open the door.So are you interesting in how do automatic doors work? Automatic Door Sensors are the key part of this advanced technology. These days, most automatic doors use motion detection sensors or optical sensors, which are installed on the sides of the door, to trigger the opening/closing of doors. These Automatic Door Sensors, as their names imply, detect or ‘look for’ motion in front of the gate. In these sensors, motion is detected by a microwave beam (10.5 GHz) produced by an antenna that is installed on the door header and generally points in the downward and outward direction. These Automatic Door Sensors are quite effective, but have one major shortcoming: they can only detect motion. Therefore, a person who is standing still or walking very slowly (like senior citizens) might not be detected, which can lead to accidents or s...