Hardened solar energy collector system
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first embodiment
[0057]FIG. 3a shows cross-section of an individual collector tube (302) according to the present disclosure. The collector tube (302) has a collector surface (304) having longitudinal ridges (306) which collectively form a diffractive optical structure that redirects incoming off-axis radiation to into the collector to heat the working fluid therein. FIG. 3a also illustrates schematically how optical rays at various angles of incidence are diffracted onto the collection surfaces. FIG. 3b is a perspective view of the embodiment with longitudinal ridge DOEs which better illustrates the longitudinal alignment of ridges (306).
second embodiment
[0058]FIGS. 3c and 3d depict a collector tube design according to the present disclosure. FIGS. 3c and 3d show collector tubes (310), (311) having respective collector surfaces (314), (315). In this embodiment, the collector surfaces include a plurality of transversely oriented ridges (318) shown more clearly in FIG. 3d._In another embodiment shown in FIGS. 3e and 3f depict another embodiment of a collector rube in which collector rubes (320), (321) have collector surfaces that include a plurality of rasp-shaped diffractive optical elements (328). This embodiment is further optimized for optical diffraction purposes and provides a number of benefits. It is also an easy shape to manufacture in high volume even on a curved surface.
[0059]In some embodiments, the diffractive optical elements can comprise holographic optical elements. FIG. 4a shows a perspective view of an embodiment of a collector (402) that includes a holographic optical element (404). An exemplary patterned holographi...
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