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Fresnel lens (flaky):
7809-5(43*24.5)
Focal length: 25MM
Distance: 12M
Angle: 110 degrees
When the Fresnel optical lens mounts multiple passive infrared alarms in a large area of the room, because it is passive, there is no problem of system mutual interference.
Work is not affected by sounds, ie sounds do not make it false positives. Internationally, large-scale Fresnel lenses have been developed and attempted to produce solar collectors. Fresnel lens is a planar condenser, light weight, low price, but also a little focus and line focus, generally made of plexiglass or other transparent plastic, but also made of glass, is mainly used for concentrating solar cells Power system.
From the 1970s to the 1990s, Fresnel lenses used in solar installations were developed. Some people used the molding method to process a large area of flexible transparent plastic Fresnel lens, and some people also used a combination molding tool to process a point-focusing Fresnel lens with a diameter of 1.5m. The result was not ideal. Some people use the molding method to process linear glass Fresnel lens, but the accuracy is not enough, still need to be improved. There are also two new types of solar concentrators designed using the principle of total reflection. Although they have not yet been applied, they are instructive. One is an optical fiber concentrator, which consists of a fiber optic lens and an optical fiber connected to it. The sunlight is focused by the fiber lens and transmitted from the fiber to the place of use. The other is a fluorescent concentrator, which is actually a transparent plate (generally an organic glass) with a fluorescent pigment added. It absorbs part of the sunlight that has the same wavelength as the fluorescent absorption band, and then has longer wavelengths than the absorption band. The emission band emits fluorescence. The fluorescence emitted is due to the difference between the plate and the surrounding medium, and is guided to the edge face of the plate in a total reflection manner within the plate. The light gathering ratio depends on the ratio of the plate area and the edge area, and it is easy to reach 10 to 100. It absorbs incident light in different directions, and it also absorbs scattered light without tracking the sun.
