In a previous paper, the results of photogrammetric measurements of a number of paraboloidal reflecting surfaces were presented. These results showed that photogrammetry can provide three-dimensional surface characterisations of such solar concentrators. The present paper describes the assessment of the quality of these surfaces as a derivation of the photogrammetrically produced surface coordinates. Statistical analysis of the z-coordinate distribution of errors indicates that these generally conform to a univariate Gaussian distribution, while the numerical assessment of the surface normal vectors on these surfaces indicates that the surface normal deviations appear to follow an approximately bivariate Gaussian distribution. Ray tracing of the measured surfaces to predict the expected flux distribution at the focal point of the 400 m2 dish show a close correlation with the videographically measured flux distribution at the focal point of the dish.
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November 1997
Research Papers
Photogrammetry: An Available Surface Characterization Tool for Solar Concentrators, Part II: Assessment of Surfaces
M. Shortis,
M. Shortis
Department of Geomatics, University of Melbourne, Parkville 3052, Australia
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G. Johnston
G. Johnston
Department of Engineering, Australian National University, Canberra 0200, Australia
Search for other works by this author on:
M. Shortis
Department of Geomatics, University of Melbourne, Parkville 3052, Australia
G. Johnston
Department of Engineering, Australian National University, Canberra 0200, Australia
J. Sol. Energy Eng. Nov 1997, 119(4): 286-291 (6 pages)
Published Online: November 1, 1997
Article history
Received:
June 1, 1995
Revised:
March 1, 1997
Online:
February 14, 2008
Citation
Shortis, M., and Johnston, G. (November 1, 1997). "Photogrammetry: An Available Surface Characterization Tool for Solar Concentrators, Part II: Assessment of Surfaces." ASME. J. Sol. Energy Eng. November 1997; 119(4): 286–291. https://doi.org/10.1115/1.2888034
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