What type of sensor is commonly used to detect obstructions in elevator door operations?

Infrared sensors are commonly utilized in elevator door operations to detect obstructions. They work by emitting infrared light and measuring the reflection or interruption of that light to identify whether an object is present in the path of the door. This capability is crucial for ensuring safety, as it prevents the elevator doors from closing on passengers or objects, thereby reducing the risk of injuries and accidents.

The presence of infrared sensors allows for the consistent and reliable detection of items within the door's swing area, which is essential in operating an elevator safety system. Their effectiveness in real-time response makes them the preferred choice in modern elevator design, where safety protocols are paramount.

While curtain sensors, weight sensors, and proximity sensors also play roles in various applications, they do not focus specifically on obstruction detection in the same manner or context as infrared sensors do within elevator systems.