Among them, the cylindrical Fresnel lens—often overlooked compared to its concentric cousin—has emerged as a key enabler of next-generation passive infrared (PIR) detection systems.
In this article, we share how Aubor Optical developed a custom 1650nm Fresnel lens for an industrial customer—focusing on material selection, optical design, and practical molding considerations.
Aubor Technology Watch | July 2025
In most passive infrared (PIR) motion detection systems, the Fresnel lens has long been treated as a static, well-understood component. It focuses infrared radiation onto a pyroelectric sensor
In this article, we’ll dive into the core principles of PIR detection, explain how materials affect detection performance, and reveal why false alarms are often symptoms of optical misalignment or material mismatches—not just electronic noise.
