Directional response error in integrating-sphere transmittance measurements at solar wavelengths

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Solar Energy

DOI:https://doi.org/10.1016/0038-092X(95)00031-L· OSTI ID:219849

Milburn, D I; Hollands, K G.T. ^[1]

---

1. Univ. of Waterloo (Canada)

To correctly measure the solar transmittance of a material that scatters light, a detector with uniform directional response must be used, and the integrating sphere is often used in combination with an optical detector for this purpose. However, no real optical detector system has a completely uniform directional response; thus a directional response error will always exist. This note analyzes the directional response error in directional-hemispherical transmittance measurements at solar wavelengths and determines this error for transmittance measurements on materials that scatter light in different ways, made with a state-of-the-art integrating-sphere-spectrophotometer system. It is shown that for certain types of materials, the directional response error is the dominant error in the measurement of directional-hemispherical transmittance. 18 refs., 4 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 219849
• Journal Information: Solar Energy, Journal Name: Solar Energy Journal Issue: 2 Vol. 55; ISSN SRENA4; ISSN 0038-092X
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
99 GENERAL AND MISCELLANEOUS
ERRORS
GLAZING
MATERIALS TESTING
MEASURING METHODS
OPTICAL PROPERTIES
PERFORMANCE
SOLAR RADIATION
TRANSMISSION