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Reflectance panel anisotropy and diffuse radiation - some implications for field spectroscopy

Reflectance panel anisotropy and diffuse radiation - some implications for field spectroscopy
Reflectance panel anisotropy and diffuse radiation - some implications for field spectroscopy
Field goniometer measurements were obtained to examine the angular variation in the reflectance of direct beam, diffuse and global radiation from two types of SpectralonTM panel. The results indicate that optical grade (99% reflective) and grey (20% reflective) SpectralonTM exhibit different non-Lambertian properties with respect to direct beam irradiance. The angular variation in the reflectance of diffuse radiation by the panel appears independent of the panel type but varies with the diffuse to global (D : G) irradiance ratio, especially at large solar zenith angles. The combined effect of the angular response to direct beam and diffuse radiation is that panel reflectance of the global flux shows only slight variation with angle for solar zenith angles up to 55 for optical grade SpectralonTM. For larger solar zenith angles panel reflectance increases markedly with angle.
0143-1161
2799-2810
Rollin, E.M.
32665285-7f95-40a4-9775-7a9b2958f758
Milton, E.J.
c447d4a7-b6ee-4782-a205-f240e3f5488b
Emery, D.R.
59ad41d5-e39d-418f-b4b3-e478f8d7dec3
Rollin, E.M.
32665285-7f95-40a4-9775-7a9b2958f758
Milton, E.J.
c447d4a7-b6ee-4782-a205-f240e3f5488b
Emery, D.R.
59ad41d5-e39d-418f-b4b3-e478f8d7dec3

Rollin, E.M., Milton, E.J. and Emery, D.R. (2000) Reflectance panel anisotropy and diffuse radiation - some implications for field spectroscopy. International Journal of Remote Sensing, 21 (15), 2799-2810. (doi:10.1080/01431160050121258).

Record type: Article

Abstract

Field goniometer measurements were obtained to examine the angular variation in the reflectance of direct beam, diffuse and global radiation from two types of SpectralonTM panel. The results indicate that optical grade (99% reflective) and grey (20% reflective) SpectralonTM exhibit different non-Lambertian properties with respect to direct beam irradiance. The angular variation in the reflectance of diffuse radiation by the panel appears independent of the panel type but varies with the diffuse to global (D : G) irradiance ratio, especially at large solar zenith angles. The combined effect of the angular response to direct beam and diffuse radiation is that panel reflectance of the global flux shows only slight variation with angle for solar zenith angles up to 55 for optical grade SpectralonTM. For larger solar zenith angles panel reflectance increases markedly with angle.

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Published date: 2000

Identifiers

Local EPrints ID: 4995
URI: https://eprints.soton.ac.uk/id/eprint/4995
ISSN: 0143-1161
PURE UUID: 3778ca2c-0875-4ede-a321-67d239235479

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Date deposited: 13 May 2004
Last modified: 15 Jul 2019 19:39

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Contributors

Author: E.M. Rollin
Author: E.J. Milton
Author: D.R. Emery

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