Fresnel lens,also known as threaded lens, is a sheet made of PMMA material,which is also made of glass.the surface of the lens is smooth on one side and the concentric circles on the other side are small to large.its texture is designed according to the dryness of the light involved in the disturbance and the relative sensitivity and acceptance angle requirements.The light enters from one side passes through the Fresnel lens on one side and focuses out to a point or in parallel light.Such lenses are usually designed as collimating mirrors(such as Fresnel lenses for projection,magnifying)and concentrating mirrors(such as Fresenl lenses for collecting heat for solar energy)

Fresnel Light

Fresnel equation

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(If groove pitch is density, then quality of image that is maginifed is clearer.If groove pitch is width, then efficince of concentration of light is higher.)

Fresnel effect

Also we design to use more 3mm Optical PMMA for loner life time and to have 0.5 ~ 1.0mm groove pitch for higher solar concentration.

Fresnel Blender

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The transmittance of the material is important to be the influence of the lens, so the high transmittance material Fresnel Factory using is Poly visible (UV CUT).

Fresnel pronunciation

From F1.2, the efficency is dramatically droped. It shows there is a certain ratio between focal length of fresnel and diameter of lens.

Concentration rate is ratio between area of solar cell and area of Fresnel lens. Ex) Fresnel lens size 120*120mm → area of lens is 14400mm2 Solar cell size 5*5mm → area of solar cell is 25mm2 Concentration rate is 14400/25 = 576 times

Fresnel lens

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However because of transmittance rate and other obstructs, multiple 80% is reasonable. Adjusted concentration rate is (14400*0.8)/25 = 460 times

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