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Mar 29,2023
The History of Fresnel Lenses
During the era of human seafaring, lighthouses, as iconic structures, have played an indispensable role in guiding humanity’s ongoing exploration of the unknown. Yet the most critical component of a lighthouse is not the tower itself, but the light—more precisely, the lens within the light.
Characteristics and Principles of Fresnel Lenses
Fresnel lenses come in various sizes; the first-order lens, commonly used in lighthouses, is the largest and most powerful, with a diameter exceeding 1.8 meters. Its beam is primarily employed as a coastal light, visible from a distance of 32 kilometers offshore. The sixth-order lens, by contrast, is the smallest, measuring only about 30 centimeters in width, and is used in harbors and navigation channels.
The Stealth Capability of Fresnel Lenses
Fresnel lenses not only boast powerful light-concentrating capabilities; recent research has also revealed another remarkable property: stealth.
