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Title: Chromatic dispersion compensation in a Fresnel lens by means of a diffraction grating

Abstract

A Fresnel lens's imaging performance can be seriously impaired by chromatic dispersion which typically doubles the diameter of the focused sun image in a solar concentrator. This problem can be alleviated by means of a molded diffraction grating whose diffraction-induced dispersion offsets and substantially cancels the lens's intrinsic refractive index dispersion. The grating lines would comprise a second tier of small-scale, Fresnel-type facets superimposed on the lens facets, with a typical grating facet height of about 40 microinches and a facet width ranging from about 1 milliinch at the edge of the lens to around 5 or 10 milliinches near the center. In its primary intended application the grating would function in a core daylighting system to improve the optical performance of a collector which focuses direct sunlight into fiber optic couplers. For this application chromatic dispersion would be reduced by an order of magnitude with only a 2% loss in optical efficiency. 6 refs., 9 figs.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
DOE/CE
OSTI Identifier:
5231732
Report Number(s):
LBL-27950; CONF-890836-22
Journal ID: ISSN 0277-786X; ON: DE90004030
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Journal Volume: 1149; Conference: 33. SPIE annual international technical symposium on optical and optoelectronic applied science and engineering, San Diego, CA (USA), 6-11 Aug 1989
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; FRESNEL LENS; PERFORMANCE TESTING; CHROMATIC ABERRATIONS; DAYLIGHTING; DIFFRACTION; ENERGY EFFICIENCY; FIBER OPTICS; GEOMETRY; GRATINGS; ILLUMINANCE; LIGHT TRANSMISSION; MATHEMATICAL MODELS; OPTICAL DISPERSION; REFRACTION; SOLAR ENERGY CONVERSION; COHERENT SCATTERING; CONVERSION; EFFICIENCY; ENERGY CONVERSION; LENSES; MATHEMATICS; SCATTERING; TESTING; 141000* - Solar Collectors & Concentrators; 990200 - Mathematics & Computers; 320106 - Energy Conservation, Consumption, & Utilization- Building Equipment- (1987-)

Citation Formats

Johnson, K. C. Chromatic dispersion compensation in a Fresnel lens by means of a diffraction grating. United States: N. p., 1989. Web. doi:10.1117/12.962179.
Johnson, K. C. Chromatic dispersion compensation in a Fresnel lens by means of a diffraction grating. United States. doi:10.1117/12.962179.
Johnson, K. C. Tue . "Chromatic dispersion compensation in a Fresnel lens by means of a diffraction grating". United States. doi:10.1117/12.962179. https://www.osti.gov/servlets/purl/5231732.
@article{osti_5231732,
title = {Chromatic dispersion compensation in a Fresnel lens by means of a diffraction grating},
author = {Johnson, K. C.},
abstractNote = {A Fresnel lens's imaging performance can be seriously impaired by chromatic dispersion which typically doubles the diameter of the focused sun image in a solar concentrator. This problem can be alleviated by means of a molded diffraction grating whose diffraction-induced dispersion offsets and substantially cancels the lens's intrinsic refractive index dispersion. The grating lines would comprise a second tier of small-scale, Fresnel-type facets superimposed on the lens facets, with a typical grating facet height of about 40 microinches and a facet width ranging from about 1 milliinch at the edge of the lens to around 5 or 10 milliinches near the center. In its primary intended application the grating would function in a core daylighting system to improve the optical performance of a collector which focuses direct sunlight into fiber optic couplers. For this application chromatic dispersion would be reduced by an order of magnitude with only a 2% loss in optical efficiency. 6 refs., 9 figs.},
doi = {10.1117/12.962179},
journal = {},
issn = {0277-786X},
number = ,
volume = 1149,
place = {United States},
year = {1989},
month = {8}
}

Conference:
Other availability
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