菲涅尔透镜
菲涅尔透镜又称螺纹透镜，菲涅尔透镜多由聚烯烃材料制成，透镜表面光滑，另一面由小到大填充同心圆。
PIR sensor must work with the Fresnel lens, to insure the long detect rang. Fresnel lens is the precision optical lens.
There are two type for fresnel lens, flat and round. The main material for fresnle lens is poly methyl methacrylate.
Fresnel Lens are widely used in human motion switch, intrusion alarm system, infrared thermal sensor.
Fresnel lens can focus the PIR point. PIR detect rang will be more distance and large.
Fresnel lens can be made of plastic or glasses. Most of the PIR sensor use the plastic type.
According to your case color, we can design difference color of the fresnel lens.
The fresnel lens is a optical element, one side is smooth, another side is by a ring a part of concentric garden composition.
The appilcation of Fresnel Lens. When people goes in to the detect rang, Fresnel lens fouse the infrared on the PIR sensor, then the PIR sensor will change the optical signal to electrical signal in order to realize the PCB works.
Senba is the specilist Fresnel lens manufacturer in China. We can offer the high quality products with best price.
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