The measurement of concentrated solar radiation is often done by using the Lambertian target and video camera technique. With these instruments the recording of two-dimensional flux maps is performed by moving a white and diffuse reflecting target into the beam and taking an image of the reflection pattern with the camera. Many of the present and past instruments are based on this principle, e.g. for analyzing dish, tower, or solar furnace performance. The method relies on white, temperature resistant target materials with good Lambertian scattering properties. Solid ceramic material, powder coatings (alumina, magnesia), or other kinds of paints may be used. Recently, Lambertian transmitting diffusers have also found application. The investigations reported in the paper revealed that many of the tested samples show good diffuse reflection and transmission properties. Only a flat PTFE sheet and two white temperature resistant paints show a distinct directional reflectance component or a higher deviation from Lambertian property. In transmission, a pronounced directional component is shown by an etched glass plate. As mainly all of the coatings or solid materials were selected with respect to sufficient thermal stability, the good Lambertian diffusers are able to meet the requirements of high flux density measurement.
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ASME 2003 International Solar Energy Conference
March 15–18, 2003
Kohala Coast, Hawaii, USA
Conference Sponsors:
- Solar Energy Division
ISBN:
0-7918-3676-2
PROCEEDINGS PAPER
Review of Optical Properties for Lambertian Diffusers in Solar Energy Application
Andreas Neumann,
Andreas Neumann
German Aerospace Center (DLR), Cologne, Germany
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Gregor Schmitt
Gregor Schmitt
German Aerospace Center (DLR), Cologne, Germany
Search for other works by this author on:
Andreas Neumann
German Aerospace Center (DLR), Cologne, Germany
Gregor Schmitt
German Aerospace Center (DLR), Cologne, Germany
Paper No:
ISEC2003-44039, pp. 231-242; 12 pages
Published Online:
January 5, 2009
Citation
Neumann, A, & Schmitt, G. "Review of Optical Properties for Lambertian Diffusers in Solar Energy Application." Proceedings of the ASME 2003 International Solar Energy Conference. Solar Energy. Kohala Coast, Hawaii, USA. March 15–18, 2003. pp. 231-242. ASME. https://doi.org/10.1115/ISEC2003-44039
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