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Nickel-plated Fresnel optical lens. The Fresnel lens has two functions: one is focusing, that is, the pyro-infrared signal is refracted (reflected) on the PIR by the Fresnel optical lens. The second role is to divide the detection area into several bright and dark areas; molding, injection molding, casting and other manufacturing processes. Fresnel lens is a widely used optical element Fresnel optical lens, its design and Manufacturing design to a number of technical areas, including optical engineering, polymer materials engineering Fresnel optical lens, you can go to the next understanding of Shandong Yuying Optical Instrument Co., Ltd., diamond turning process. Enables moving objects entering the detection area to change in PIR in the form of temperature changes. Freon infrared signal is produced by Fresnel optics. CNC machining is a professional Fresnel optics for producing Fresnel lenses. lens.