Light confining cavity with angular-spatial limitation of the es

Details Light confining cavity with angular-spatial limitation of the es Light confining cavity with angular-spatial limitation of the es

1991-07-19

1994-03-01

Arnold, Bruce Y.

Optical: systems and elements

Building interior illumination with reflected, refracted or...

With reflection

359592, 359853, G02B 1700

Patent

active

052913317

ABSTRACT:
A light confining cavity collects much of the radiation reflected by a receiver, absorbing it imperfectly, and casts it again on the same receiver or on other receivers by means of an optical system. Only light in a bundle of rays of limited angular spread can escape from this cavity, which allows an entry aperture relatively large. Thus, the irradiance at the entry aperture may be low, and in some cases even lower than the irradiance at the absorber. In this way the requirements for the cavity materials and for the concentrating system feeding light to the cavity can be relaxed. The invention is of special interest in photovoltaic conversion devices because it improves the absorption of the solar cells and achieves higher conversion efficiency for photons of different energies by using solar cells of different materials.

REFERENCES:
patent: 4960468 (1990-10-01), Sinton et al.

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