Determination of accuracy of measurements by NREL's Scanning Hartmann Optical Test instrument

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NREL's Scanning Hartmann Optical Test (SHOT) instrument is routinely used to characterize the surface of candidate dish concentration elements for solar thermal applications. An approach was devised to quantify the accuracy of these measurements. Excellent reproducibility was exhibited and high confidence established. The SHOT instrument was designed to allow the surface figure of large optical test articles to be accurately specified. Such test articles are nominally parabolic with an f/D ratio (in which f=focal length and D=aperture diameter) in the range of 0.5--1.0. Recent modifications of SHOT have extended the characterization range out to about f/D=3.0. A series of experiments ... continued below

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Pages: (7 p)

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Jorgensen, G.; Wendelin, T. & Carasso, M. April 1, 1991.

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Description

NREL's Scanning Hartmann Optical Test (SHOT) instrument is routinely used to characterize the surface of candidate dish concentration elements for solar thermal applications. An approach was devised to quantify the accuracy of these measurements. Excellent reproducibility was exhibited and high confidence established. The SHOT instrument was designed to allow the surface figure of large optical test articles to be accurately specified. Such test articles are nominally parabolic with an f/D ratio (in which f=focal length and D=aperture diameter) in the range of 0.5--1.0. Recent modifications of SHOT have extended the characterization range out to about f/D=3.0. A series of experiments was designed to investigate and quantify the uncertainties associated with optical characterization performed by SHOT. This approach involved making a series of measurements with an arbitrary test article positioned at a number of locations transverse to the optical axis of SHOT. 3 refs.

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Pages: (7 p)

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OSTI; NTIS; GPO Dep.

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  • World congress of the International Solar Energy Society, Denver, CO (United States), 19-23 Aug 1991

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  • Other: DE92010571
  • Report No.: NREL/TP-257-4190
  • Report No.: CONF-910802--6
  • Grant Number: AC02-83CH10093
  • Office of Scientific & Technical Information Report Number: 5303548
  • Archival Resource Key: ark:/67531/metadc1074813

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1991

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  • Feb. 4, 2018, 10:51 a.m.

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  • May 29, 2018, 4:54 p.m.

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Jorgensen, G.; Wendelin, T. & Carasso, M. Determination of accuracy of measurements by NREL's Scanning Hartmann Optical Test instrument, article, April 1, 1991; Golden, Colorado. (https://digital.library.unt.edu/ark:/67531/metadc1074813/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.