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How do automatic door sensor work?
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Automatic door sensors typically work using one of several technologies, including:
Infrared Sensors (IR): These sensors emit infrared light beams across the doorway. When an object, such as a person or a vehicle, interrupts these beams, the sensor detects the interruption and triggers the door to open. There are typically two types of IR sensors used: active and passive. Active IR sensors emit their own infrared light and detect when it's interrupted. Passive IR sensors detect changes in the infrared radiation emitted by objects in their field of view.
Microwave Sensors: Microwave sensors emit microwave signals and measure the reflections off objects in the vicinity. When an object moves into the detection zone, it alters the pattern of the reflected microwaves, triggering the door to open. These sensors are more sensitive to motion but can be prone to false triggers if not calibrated properly.
Ultrasonic Sensors: These sensors emit ultrasonic waves, similar to how sonar works, and detect changes in the pattern of these waves caused by nearby objects. When an object moves within the sensor's range, it triggers the door to open.
Pressure Sensors: Pressure-sensitive mats or pads are placed on the floor near the doorway. When someone steps on the mat, it detects the pressure change and signals the door to open. These are often used in conjunction with other sensors for added reliability.
Motion Sensors: These sensors use various technologies such as passive infrared (PIR) or microwave to detect motion in the doorway's vicinity. When motion is detected, the door opens.
These sensors are commonly used in various applications, including commercial buildings, retail stores, hospitals, residential and public transportation systems, to provide convenience and accessibility while also improving energy efficiency by reducing unnecessary door openings.
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Once the sensor detects the presence of an object or movement, it sends a signal to the door's controller, which activates the motor to open or close the door accordingly. When you use sensors to activate the door, you don't need touch anything to open the door.