Dispersion-compensated Fresnel lens
Patent
·
OSTI ID:7206193
A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into the lens surface. The facets would typically have a profile height of around 4[times]10[sup [minus]5] inch and a profile width of at least 10[sup [minus]3] inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight. 10 figs.
- DOE Contract Number:
- AC03-76SF00098
- Assignee:
- PTO; EDB-94-087247
- Patent Number(s):
- US 5161057; A
- Application Number:
- PPN: US 7-537230
- OSTI ID:
- 7206193
- Resource Relation:
- Patent File Date: 13 Jun 1990
- Country of Publication:
- United States
- Language:
- English
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