Determining the Optical Properties of PETAL, the 400 m2 Parabolic Dish at Sede Boqer

[+] Author and Article Information
S. Biryukov

Department of Solar Energy & Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, 84990 Israel

J. Sol. Energy Eng 126(3), 827-832 (Jul 19, 2004) (6 pages) doi:10.1115/1.1756925 History: Received September 01, 2003; Revised March 01, 2004; Online July 19, 2004
Copyright © 2004 by ASME
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PETAL: The 400 m2 paraboloidal solar concentrator at Sede Boqer, with 1 m2 test screen mounted at its focus.
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Variable-focus white screen mounted on support mast
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Response of the CCD camera under variable illumination, plotted against the short circuit current of a calibrated solar cell
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Image of the full moon on PETAL’s white screen and the corresponding 2D intensity distribution
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Negative Image of the white screen with support structure at night
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Fraction of cumulative power, included within any given radius R on the screen. Curve A, a single panel from the central zone of the dish (sun). Curve B, ensemble of 215 panels (full moon).
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White screen with image of Jupiter, produced by PETAL, as viewed from the ground
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PETAL’s caustic surface visualized by sunlight reflected off small particles in the air (focal zone additionally contrasted)
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Focal region of PETAL’s caustic surface
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The processed image of PETAL’s light caustic reflected off small particles in the air. Focal XY-plane and optical axis Z are schematically shown. I(Y) and I(Z) plots demonstrate distributions of scattered light intensity in Y and Z directions, respectively. The left plot named “ruler” demonstrates brightness distribution along the ruler, which provides the scale in Z-direction.
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Left, one hextant containing 36 individual mirror panels. (Straight lines connect the centers of several panels to the “centers of mass” of their respective intensity distributions on the screen); Right, the focal zone (enlarged).
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Comparison of cumulative power distributions of two large solar dishes: BGU’s PETAL and ANU’s Big Dish




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