- Author
- Chin, J. W. | Byrd, W. E. | Embree, E. J. | Martin, J.
- Title
- Use of Integrating Spheres as Ultraviolet Radiation Sources for Artificial Weathering of Polymers.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- Radtech 2002 Focus Group End User Technical Conference. Proceedings. April 28 - May 1, 2002, Indianapolis, IN, 931-946 p., 2002
- Keywords
- integrating sphere | polymers | ultraviolet radiation | weather effects | weathering | irradiance | equations
- Identifiers
- unnatural exposure conditions; spatial irradiance uniformity; UV light source; integrating sphere; specimen chambers
- Abstract
- Laboratory ultraviolet (UV) chambers are widely used to obtain weathering data for a wide range of commercial polymer products including coatings, textiles, elastomers, plastics and polymeric composites. Although numerous improvements have been made in the design of UV chambers over the last 80 years, the reproducibility of the exposure results from these chambers have remained elusive. This lack of reproducibility is attributed to systematic errors in their design, operation, and control which prevent direct comparisons of the performance of materials exposed in the same environment, comparisons of the performance of the same material exposed in different laboratories, and the comparison of field and laboratory results. This paper describes an innovative UV chamber design based on integrating sphere technology that greatly reduces the magnitude of these errors, as well as provides additional experimental capabilities.