The Fresnel lens for solar energy installations is developed

It's also a little bit of focus and line focus.Mainly used for concentrating solar cell power generation system, trying to make solar collector, Fresnel lens is a flat condenser

China from the 1970s to the 1990s, the price is relatively low, for solar devices for the Fresnel lens development, generally made of plexiglass or other transparent plastic.Also useful glass production, some people use the method of molding large area of flexible transparent plastic Fresnel lens, the international development of large Fresnel lens, but also some people use a combination of molding tool processing diameter 1.5m point focusing Fresnel lens, linear glass Fresnel lens has been molded, which still needs to be improved.More recently, it consisted of an optical fiber lens and a fiber connected to it.It is actually a transparent plate (usually plexiglass) with fluorescent pigments added, and then fluoresces at a longer wavelength than the absorption band, depending on the ratio of the plate's area to its edge area, which absorbs incident light in different directions.

One type of Fresnel optical lens is a fiber optic concentrator. However, it is not accurate enough. Sunlight is focused by fiber optic lens and then transmitted to the place of use by fiber optic lens.The other is a fluorescent concentrator, and the results are not very good.Can absorb sunlight consistent with fluorescence wavelength absorption band in the part, there are two kinds of advantage of total reflection principle of design of a new solar concentrator, because of the difference of plate and the surrounding medium emit fluorescence, and guidance in the form of total reflection on the plate the edges of the plate surface, although has yet to gain practical application, it is easy to reach 10, 100, light in weight.It can also absorb scattered light without tracking the sun.