Application of Fresnel Lens in Different Fields

Application of Fresnel Lens in Different Fields

Ⅰ. Fresnel lens for scientific research system

Fresnel lenses are often used in scientific research systems, and the angle between the lens and the horizontal plane is 45±5. If two rays of different wavelengths pass through the lens in parallel, they can be focused on a 2mm diameter spot. It can also be used for visual system simulation and simulation.

Ⅱ. Fresnel lens for marine lighting

The Fresnel lens for large-scale navigation lights is specially designed to match the light source of the offshore lighthouse. Its focal length is short, the light transmittance is high, and the light divergence angle is small. Under the conditions of weather visibility of 10 nautical miles, the range of the light can reach 30 nautical miles.

Ⅲ. Fresnel lens magnifier

Magnifying glass is the simplest application case of Fresnel lens. Generally speaking, a magnifying glass is a positive focus lens, which forms a virtual upright image. A Fresnel magnifying glass is an ultra-thin magnifying glass. It is made of transparent plexiglass. Of course, you can use more materials. The minimum thickness of the Fresnel magnifier made of PVC can be between 0.45mm~0.90mm, which is different from ordinary magnifiers. Its surface It is full of tiny fringes, and its spiral fringe contains many convex lenses (annular for short), which makes the light passing through it bend and cause diffraction, thereby forming an enlarged image. Fresnel lens is characterized by higher brightness than ordinary lenses, flat surface and larger radiation area.

Generally, the diameter of ordinary concave-convex lenses is very limited, but Fresnel plays a very good role in the field of magnifying glass, reaching the effect that ordinary ordinary lenses cannot achieve. Moreover, the thickness of the Fresnel magnifiers made now is only 0.45mm, and it is portable. In fact, the main function is to reduce the weight and volume of ordinary plexiglass and glass magnifiers made by traditional magnifiers.

Ⅳ. Illumination optics: Fresnel lens collimator

Usually, the Fresnel lens is cut into a spherical surface shape in order to minimize the optical error of the image during imaging. The lens can better align an ideal point light source into a parallel light source.

In real life, no light source is a real point light source, but solid state light emitters such as LEDs are very small, so as long as the distance between the lens and the LED is appropriate, it can be used as a point light source. Therefore, the Fresnel lens can collimate the LED output light into parallel light.

The traditional incandescent light source generates a large amount of radiant heat, which limits the application of plastic optical materials very close to the light source. Since most of the heat generated by the LED is conductive, plastic optical lenses can be easily applied.

When it is necessary to calibrate the beam source of the LED luminous body to a wider angle range, the most common method is to use a combination of a mirror and a Fresnel lens to reduce the amount of optical components used.

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