A-1 LxW≤100x100mm Square PIR Sensor Fresnel Lens or Human body infrared sensing Fresnel lens

MANUFACTURING FRESNEL LENSES: The first Fresnel lenses were made by tediously grinding and polishing glass by hand. Eventually, molten glass was poured into molds, but it was only with the development of optical-quality plastics and injection-molding technology in the 20th-century that the use of Fresnel lenses in many industrial and commercial applications became practical. Fresnel lenses can be manufactured from a variety of substrates. They are manufactured from acrylic to polycarbonate to vinyl, depending on the desired wavelength of operation. Acrylic is the most common substrate due to its high transmittance in the visible and ultraviolet (UV) regions, but polycarbonate is the substrate of choice in harsh environments due to its resistance to impact and high temperature. APPLICATION EXAMPLES: While French physicist Augustin-Jean Fresnel (1788 - 1827) was not the first to conceptualize a Fresnel lens, he was able to popularize it by integrating it into lighthouses. Since then, Fresnel lenses have been utilized in a variety of applications, from light collimation and light collection to magnification. Light Collimation: A Fresnel lens can easily collimate a point source by placing it one focal length away from the source. In a finite-conjugate system, the grooved side of the Fresnel lens should face the longer conjugate because this produces the best performance.