8501-2（78＊37）Fresnel lens (flaky)

Fresnel lens (flaky):

8501-2 (78*37)

Focal length: 21MM

Distance: 15M

Angle: 180 degrees

The Fresnel optical lens has two functions: one is focusing, that is, the infrared signal is refraction (reflection) on the PIR. The second function is to divide the detection area into several bright and dark areas, so that the entrance detection The moving objects in the area can generate varying pyroelectric infrared signals on the PIR in the form of temperature changes. Fresnel lens is a kind of widely used optical element. Its design and manufacturing are designed into many technical fields, including optical engineering, macromolecule material engineering, CNC machining, diamond turning process, nickel plating process; molding, injection molding, Casting and other manufacturing processes.