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- W2062181347 abstract "PETAL (Parabolic Energy Transformation and Astrophysics Laboratory) is a large multipurpose dish-shaped concentrator, located at Sede Boqer. Its 2-axis tracking paraboloidal surface, with aperture area in excess of 400m2, is constructed from 216 adjustable mirror panels. The very large aperture and high concentration ratio of PETAL render the direct characterization of its optical performance a nontrivial task. We have applied a variety of methods in order to assess PETAL’s optical quality. These include imaging the full moon and Jupiter at night, and analysis of the 3-D caustic image produced by the scattering of focused sunlight off particles in the air. The main results of these studies, together with the preliminary results of measurements on 36 individual panels, are presented here. Among the three measurements that look at objects of the same angular size (i.e. the sun and moon), the average image size (i.e. radius of circle containing 90% of the intensity) is 0.247±0.012m, demonstrating a 5% spread about the mean for three different methods. This result is in agreement with 0.22 m for the Jupiter image. Successful application of these methods for characterization of PETAL proves their applicability to more commonly used solar dishes of smaller sizes but with similar or better concentration ratios." @default.
- W2062181347 created "2016-06-24" @default.
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- W2062181347 date "2004-07-19" @default.
- W2062181347 modified "2023-09-27" @default.
- W2062181347 title "Determining the Optical Properties of PETAL, the 400m2 Parabolic Dish at Sede Boqer" @default.
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- W2062181347 doi "https://doi.org/10.1115/1.1756925" @default.
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