Fiber Optic Daylighting System using Linear Fresnel Lens

objective

The idea behind the system is to capture high-intensity sunlight and then focus it over the optical fibers. Direct sunlight was focused through the linear Fresnel lens. The light went through a collimating lens and then the collimated light illuminated the optical fibers. It was difficult to achieve a very high concentration of light with the linear Fresnel lens. To demonstrate the system, perfect alignment, and a high concentration was necessary. Thus, there is a need to solve the high-concentration issue to use both concentrators for the optical fibers. Previously, the linear Fresnel lens was not introduced in daylighting systems due to the issues described above. To solve the issue of high concentration, the trough CPC, which is a well-known, non-imaging optical element, is introduced upstream of the optical fibers. The trough CPC captured collimated light and then maximum sunlight was diverted into the optical fibers. As shown in Fig, collimated light entered into the trough CPC through the linear Fresnel lens and then light entered into the optical fibers.

Linear Fresnel lens based solar lighting system

Method

Direct sunlight was focused through the linear Fresnel lens. The light went through a collimating lens and then the collimated light illuminated the optical fibers. It was difficult to achieve a very high concentration of light with the linear Fresnel lens. To demonstrate the system, perfect alignment, and a high concentration was necessary. Thus, there is a need to solve the high-concentration issue to use the concentrator for the optical fibers.

Previously, the linear Fresnel lens was not introduced in daylighting systems due to the issues described above. To solve the issue of high concentration, the trough CPC, which is a well-known, non-imaging optical element, was introduced upstream of the optical fibers. The trough CPC captured collimated light and then maximum sunlight was diverted into the optical fibers. As shown in the following Figure, collimated light entered into the trough CPC through the linear Fresnel lens and then light entered into the optical fibers. Perfect alignment of the components was achieved to produce better results for both approaches.

Daylighting system using linear Fresnel lens without trough CPC Daylighting system using linear Fresnel lens with trough CPC

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