What type of lens pattern should a PIR have to effectively protect areas under skylights or near roof entries?

A curtain lens pattern for a passive infrared (PIR) sensor is designed to create narrow detection zones. This makes it particularly effective in scenarios where protection is needed for areas like those under skylights or near roof entries. By focusing the detection on a vertical plane, a curtain lens can effectively monitor the specific area without detecting excessive movement from other directions, which could lead to false alarms.

In environments with entry points such as skylights, the vertical curtain effect of this lens type helps to ensure that it captures motion that may occur in these targeted zones while minimizing the detection of movements that are not relevant to the area being monitored. This capability is essential for security applications, where precision in detection is crucial for the effective operation of an intrusion detection system.