Why are infrared sensor beams widely used in automatic doors?

Infrared sensor beam widely used in automatic doors primarily because they perfectly meet the core requirements of security, reliability, and practicality for automatic door systems.

Here are several key reasons:

1. Precise Detection Zone Control (The Most Critical Reason)

Active infrared detectors operate by emitting and receiving invisible infrared beams. In automatic door applications, they are typically mounted on both sides of the pedestrian path (e.g., on the door frame), forming one or more highly precise, narrow detection planes.

This can be likened to a “light curtain” or “light screen”: unlike microwave or passive infrared detectors, it does not have a broad, fan-shaped detection area. Its detection zone is precisely that narrow beam. The sensor triggers only when an object crosses this beam plane exactly.

2. Exceptional Reliability

The principle is straightforward: “Transmit-Receive-Block-Trigger.” This logic chain is remarkably short and unambiguous. There are no complex algorithms to judge target shape, heat, or speed—the signal triggers simply when the beam is interrupted. This design ensures high reliability with relatively low failure rates.

3. Proactive Triggering, Rapid Response