What types of sensors are commonly used in automatic revolving doors?

Automatic revolving doors have become a staple of modern architecture, providing a seamless and energy-efficient entry and exit solution for various commercial and public buildings. One of the key elements that make these doors both convenient and safe is the use of sensors. These sensors are essential for detecting motion, ensuring safety, and facilitating smooth operation. In this article, we will explore the common types of sensors used in automatic revolving doors.

1. Motion Sensors

Motion sensors are the backbone of automatic revolving doors. They play a crucial role in detecting the presence of people approaching the door. These sensors use various technologies to sense motion, including:

a. Infrared (IR) Sensors: Infrared motion sensors emit an infrared beam and detect changes in this beam when a person or object moves within its field. They are often used in automatic revolving doors to trigger door movement when someone approaches.

b. Ultrasonic Sensors: Ultrasonic sensors emit high-frequency sound waves and measure the time it takes for the sound waves to bounce back after hitting an object. They are useful in detecting the presence of people within the door's proximity.

c. Microwave Sensors: Microwave sensors use electromagnetic waves to detect motion. They are highly sensitive and work effectively in various environmental conditions, making them suitable for use in automatic revolving doors.

2. Presence Sensors

Presence sensors are designed to ensure that the revolving door is safe and does not accidentally rotate when someone is within its chambers. The following types of sensors are commonly used:

a. Safety Beams: Safety beams are installed within the door's structure, emitting an invisible beam of light across the door's entrance. If this beam is interrupted while the door is in motion, the door will stop, preventing accidents.

b. Pressure Mats: Pressure mats are placed at the bottom of the revolving door. They detect pressure or weight when someone stands on them, causing the door to stop or reverse its movement.

3. Push-Button Sensors

Push-button sensors are used to allow users to manually control the revolving door. These buttons are often located near the door and can be pressed to initiate door movement. They are particularly useful for people with mobility issues or those who prefer manual operation.

Access Control Systems

In some automatic revolving doors, access control systems are integrated to enhance security. These systems include:

a. Card Readers: Card readers, often using RFID (Radio-Frequency Identification) technology, enable authorized users to access the building by swiping their access cards or badges. When the card is recognized, the door is unlocked.

b. Biometric Scanners: Biometric scanners, such as fingerprint or retinal scanners, are used for enhanced security. These sensors grant access only to individuals with verified biometric data.

4. Infrared Safety Sensors

Infrared safety sensors are positioned in various parts of the revolving door to prevent it from closing on someone. These sensors can detect objects or people in the door's path, prompting it to stop or reverse its rotation. They are essential for preventing accidents and injuries.

Conclusion

Automatic revolving doors have evolved into sophisticated entry systems with a range of sensors to ensure smooth operation, safety, and security. These sensors, including motion sensors, presence sensors, push-button sensors, access control systems, and infrared safety sensors, work together to create a seamless and secure entry and exit experience for users while promoting energy efficiency and reducing the loss of conditioned air in climate-controlled spaces. Understanding the types of sensors used in automatic revolving doors helps us appreciate the engineering and technology behind these innovative architectural solutions.

 

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