- Author
- Waksman, D. | Roberts, W. E. E.
- Title
- Evaluation of Infrared Reflectance as a Technique for Measuring Absorber Materials Degradation.
- Coporate
- National Bureau of Standards, Gaithersburg, MD
- Sponsor
- Department of Energy, Washington, DC
- Report
- NBSIR 84-2916, September 1984,
- Distribution
- Available from National Technical Information Service
- Keywords
- antireflection coatings; reflectance; measurement; degradation; infrared spectra | solar collectors
- Identifiers
- solar absorbers; solar collectors
- Abstract
- Current ASTM standards concerned with the durability and reliability of absorptive coatings rely on integrated solar absorptance and emittance as the primary methods for assessing changes in absorber optical performance resulting from environmental exposure. This study was undertaken to determine if infrared reflectance measurements are a more sensitive technique for detecting absorber materials degradation. Spectral measurements were made to identify factors that could affect the reproducibility of infrared reflectance measurements and to compare their ability to detect changes with currently used methods for absorber materials. Recommendations are made concerning the use and limitations of infrared reflectance measurements for this purpose.