Introduction. • Compound Parabolic Concentrators (CPCs) are designed to efficiently collect and concentrate distant light sources, with some acceptance angle. Compound parabolic concentrator (CPC) has been gaining ever-increasing attention from academic researchers and industrial developers owing to its. A novel asymmetric lens-walled compound parabolic concentrator (ALCPC) for integration with the building south wall was proposed and manufactured.


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Since these may be arbitrary rays crossing c, it may be concluded that the optical path length between w1 and w2 is the same for all rays perpendicular to incoming wavefront w1 and outgoing wavefront w2. This relationship between rays and wavefronts is valid in general. Flow-line design method[ edit ] This section's factual accuracy is compound parabolic concentrator.

Relevant compound parabolic concentrator may be found on Talk: Please help to ensure that disputed statements are reliably sourced. January Learn how and when to remove this template message The flow-line or Winston-Welford design method typically leads to optics which guide the light confining it between two reflective surfaces.

These types of optics may be obtained, for example, by applying the edge ray of nonimaging optics to the design of mirrored optics, as show in figure "CEC" on the right.

It is composed compound parabolic concentrator two elliptical mirrors e1 with foci S1 and R1 and its symmetrical e2 with foci S2 and R2. CEC Mirror e1 redirects the rays coming from the edge S1 of the source towards the edge R1 of the receiver and, by symmetry, mirror e2 compound parabolic concentrator the rays coming from the edge S2 of the source towards the edge R2 of the receiver.

This device does not form an image of the source S1S2 on the receiver R1R2 as indicated by the green rays coming from a point S in the source that end up on the compound parabolic concentrator but are not focused onto an image point.

Mirror e2 starts at the edge R1 of the receiver since leaving a gap between mirror and receiver would allow light to escape between the two.

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Also, mirror e2 ends at ray r connecting S1 and R2 since cutting it short would prevent it from capturing as much light as possible, but extending it above r would shade light coming from S1 and its neighboring points compound parabolic concentrator the source.

CPC A particular case of this design happens when the source S1S2 becomes infinitely large and moves to an infinite distance.

Then the rays coming from S1 become parallel rays and the same for those coming from S2 and the elliptical mirrors e1 and e2 converge to parabolic mirrors p1 and p2. CPCs are the most common seen nonimaging optics. They are often used to demonstrate the difference between Imaging optics and nonimaging compound parabolic concentrator.

This is called the acceptance angle of the CPC. The reason for this name can be appreciated in the compound parabolic concentrator "rays showing the acceptance angle" on the right. The ellipses of a CEC can be obtained by the pins and string methodas shown in the figure "string method" on the left.

A string of constant length is attached to edge point S1 of the source and edge point R1 of the receiver. String method The string is kept stretched while moving a pencil up and down, drawing the elliptical mirror e1.

compound parabolic concentrator

Nonimaging optics - Wikipedia

We can now consider a wavefront w1 as a circle centered at S1. This wavefront is perpendicular to all rays coming out of S1 and the distance from S1 to w1 is compound parabolic concentrator for all its points.

The same is valid for wavefront w2 centered at R1. The distance from w1 to w2 is then constant for all light rays reflected at e1 and these light rays are perpendicular to both, incoming wavefront w1 compound parabolic concentrator outgoing wavefront w2. Optical path length OPL is compound parabolic concentrator between wavefronts.

When applied to nonimaging optics, this result extends the string method to optics with both refractive and reflective surfaces.

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