Back to Search
Start Over
Maps of sky relative radiance and luminance distributions acquired with a monochromatic CCD camera
- Source :
- Solar Energy. Nov, 2007, Vol. 81 Issue 11, p1323, 10 p.
- Publication Year :
- 2007
-
Abstract
- The purpose of this work is to characterize the sky relative radiance and luminance distributions from the analysis of sky images acquired using a monochromatic CCD wide angle lens camera. The proposed methodology is based on the reduction of the number of the gray levels from the original image, in order to sharpen the different regions of the sky hemisphere, resulting in low level gray scale maps. In these maps each gray level is related to an intensity level and each pixel is associated to a sky direction. An experimental system that is able to simultaneously supply images from the sky and solar irradiance data was developed using a commercial CCD camera. The sky relative radiance and luminance distributions for different sky conditions were also determined. The resultant maps agree with observations of the main characteristics of sky radiance and luminance distributions. Keywords: Solar radiation; Sky radiance distribution; Sky luminance distribution
- Subjects :
- Electromagnetic radiation -- Distribution
Electromagnetic waves -- Distribution
Luminescence -- Distribution
Sky -- Optical properties
Charge coupled devices -- Design and construction
Electronic cameras -- Design and construction
Electric waves -- Distribution
Digital camera
Company distribution practices
Earth sciences
Petroleum, energy and mining industries
Subjects
Details
- Language :
- English
- ISSN :
- 0038092X
- Volume :
- 81
- Issue :
- 11
- Database :
- Gale General OneFile
- Journal :
- Solar Energy
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.171401246