Photogrammetry: An Available Surface Characterization Tool for Solar Concentrators, Part II: Assessment of Surfaces

[+] Author and Article Information
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 119(4), 286-291 (Nov 01, 1997) (6 pages) doi:10.1115/1.2888034 History: Received June 01, 1995; Revised March 01, 1997; Online February 14, 2008


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.

Copyright © 1997 by The American Society of Mechanical Engineers
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