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US3780722A Expired / Lapsed US ⏱️ 0.0 years remaining

Fiber optical solar collector

Assignee: United States Department of the Navy
•
Filing: 1972-04-26
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Granted: 1973-12-25
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Expires: 1992-04-26
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Abstract

Abstract The invention is an improved solar collector comprising a fiber optical solar receiver which passively concentrates incident solar energy for delivery as an intensified flux to an absorptive target. In one embodiment of the invention, the present solar collector comprises a boule of fibers shaped into an arcuate collecting surface at one end, the fibers tapering to a flat output plane at the opposing end of the boule. Solar radiation entering the collector at the collecting surface is concentrated within the tapered portion of the boule and delivered as an intensified flux to an absorptive target disposed in operative relation to the output plane, the absorptive target being either a cookpot, a thermal storage mass, or the hot junction of a thermoelectric generator.

Inventors

  • 👤 C Swet

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 19:41
CPC Classifications
F; F24; F24S; F24S23/00; F24S23/12; Y; Y02; Y02E; Y02E10/00; Y02E10/40; Y10; Y10S; Y10S385/00; Y10S385/90

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 310 words
Apparatus for collecting solar energy and conducting the energy to a point where said energy is utilized to perform useful work, the solar energy being collected and utilized efficiently over a continuous period of time without adjustment of the apparatus, the apparatus comprising: a plurality of boules formed of light-conductive fibers, each boule having an input end and an output end and said fibers extending from said input end to said output end, the input ends of the boules being disposed in a common plane exposed to maximum solar radiation, each boule further comprising an enlarged upper portion which tapers from the input end to a constant thickness at a point between said input end and the output end, and a constant cross-sectional portion which extends from the point of termination of taper of the enlarged upper portion to the output end of the boule, the input end of each boule acting to direct a substantial portion of solar energy incident thereon into the boule wherein said energy is concentrated to an intensified flux within the enlarged upper portion and delivered to the output end of the boule through the constant cross-sectional portion thereof; a solar energy collecting surface surmounting and integrally formed with the enlarged upper portion of each of the boules, each collecting surface being formed into an arcuate curvature in the major plane of each enlarged upper portion of the respective boules and further being rounded in the dimension perpendicular to said plane, thereby providing a fan-shaped field of view for each boule whereby radiation from the sun is accepted equally well at any solar incidence angle within the field of view; and, an insulated target disposed in the path of the energy passing from the output end of each boule, the constant cross-sectional portion of each boule being shaped to deliver heat flux to the target.
Claim 2
Dependent Claim 310 words
Apparatus for collecting solar energy and conducting the energy to a point where said energy is utilized to perform useful work, the solar energy being collected and utilized efficiently over a continuous period of time without adjustment of the apparatus, the apparatus comprising: a plurality of boules formed of light-conductive fibers, each boule having an input end and an output end and said fibers extending from said input end to said output end, the input ends of the boules being disposed in a common plane exposed to maximum solar radiation, each boule further comprising an enlarged upper portion which tapers from the input end to a constant thickness at a point between said input end and the output end, and a constant cross-sectional portion which extends from the point of termination of taper of the enlarged upper portion to the output end of the boule, the input end of each boule acting to direct a substantial portion of solar energy incident thereon into the boule wherein said energy is concentrated to an intensified flux within the enlarged upper portion and delivered to the output end of the boule through the constant cross-sectional portion thereof; a solar energy collecting surface surmounting and integrally formed with the enlarged upper portion of each of the boules, each collecting surface being formed into an arcuate curvature in the major plane of each enlarged upper portion of the respective boules and further being rounded in the dimension perpendicular to said plane, thereby providing a fan-shaped field of view for each boule whereby radiation from the sun is accepted equally well at any solar incidence angle within the field of view; and, an insulated target disposed in the path of the energy passing from the output end of each boule, the constant cross-sectional portion of each boule being shaped to deliver heat flux to the target.
Claim 3
Dependent Claim 44 words
The solar energy collecting apparatus of claim 1 and further comprising filter means disposed over the output end of the boule for passing essentially all of the intensified solar flux from the output end to the target and reflecting radiation emanating from the target.
Claim 4
Dependent Claim 17 words
The solar energy collecting apparatus of claim 2 wherein the filter means comprises an aluminum-silicon oxide coating.
Claim 5
Dependent Claim 29 words
The solar energy collecting apparatus of claim 1 and further comprising a glass spacer disposed about the output end of the boule for thermal shielding of said output end.
Claim 6
Dependent Claim 21 words
The solar energy collecting apparatus of claim 1 wherein the fibers are comprised of a polystyrene plastic core having acrylic cladding.
Claim 7
Dependent Claim 23 words
The solar energy collecting apparatus of claim 1 and further comprising rigid insulation between the enlarged portions of the boules for support thereof.

References Cited (Backward Citations)

US2672288A Cited
US2825260A Cited
US2872915A Cited
US3142235A Cited
US3188478A Cited
US3535016A Cited
US3379394A Cited
US3469026A Cited
US3508589A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-12-24 1977-06-25 1977-12-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-12-24 1981-06-25 1981-12-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-12-24 1985-06-25 1985-12-25 $7700.00 Window Closed / Lapsed

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