Accession Number:

AD0773297

Title:

A Study of Some Factors Affecting the Photodegradation of Textile Yarns. Part I. The Spectral Distributions of Sun-Sky and Xenon-Arc Radiation,

Descriptive Note:

Corporate Author:

GUELPH UNIV (ONTARIO)

Personal Author(s):

• Lock,Leona M.
• Frank,Grace C.
• Stevens,J. R.

Report Date:

1972-10-18

Pagination or Media Count:

7.0

Abstract:

A detailed study was made of the relative spectral distribution of sun-sky radiation at several times of day under various sky conditions from June to October 1971. A sufficient number of spectra were recorded to provide a statistically viable sample. Average spectral distributions for three daily time periods and four classes of sky conditions within four approximately monthly periods were calculated and compared. Radiation from a sunny-bright sky over the noon period gave a representative average and would be a reasonable standard sun-sky spectral distribution for comparison with artificial light sources. The relative spectral distribution of xenon-arc radiation in combination with various filters was monitored using the same spectrographic equipment. Comparison of the sun-sky spectral distribution with the xenon arc emission spectrum indicated that although agreement of the lower cut-off wavelength could be attained using QQWG filters. Xenon radiation was deficient above 3150 A regardless of the filter used. Infrared filters removed an undesirable amount of high energy radiation and would be likely to decelerate degradation. Author

Descriptors:

• *Spectral energy distribution
• *Sunlight
• *Electric discharges
• *Xenon
• Ultraviolet radiation
• Statistical analysis
• Optical filters
• Textiles
• Yarns
• Polyester fibers
• Degradation

Subject Categories:

• Atmospheric Physics
• Textiles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE