A special goniometer is a part of a system for the measurement of the reflection properties of surfaces. The adopted measuring procedures are based on a CCD luminance meter with the aim of having a good selection of the sample under test. In particular, two methods allow the measurement of the luminance coefficient independently on the absolute calibration of the luminance meter; they allow the reduction of the overall measurement uncertainty. The methods are based on the ratio of luminance measurement of the sample under test and on the measurement of the luminance either of the light source used in the test, or of a diffusing reference sample. The measures of the luminance coefficient, with an observation angle of 1°, of a white diffuse reflectance standard and of a road paving sample are presented as examples of applications of the described methods.
MEASUREMENTS OF THE BIDIRECTIONAL REFLECTION FUNCTION - A SYSTEM FOR THE ANALYSIS OF ROAD PAVINGS
FIORENTIN, PIETRO;
2010
Abstract
A special goniometer is a part of a system for the measurement of the reflection properties of surfaces. The adopted measuring procedures are based on a CCD luminance meter with the aim of having a good selection of the sample under test. In particular, two methods allow the measurement of the luminance coefficient independently on the absolute calibration of the luminance meter; they allow the reduction of the overall measurement uncertainty. The methods are based on the ratio of luminance measurement of the sample under test and on the measurement of the luminance either of the light source used in the test, or of a diffusing reference sample. The measures of the luminance coefficient, with an observation angle of 1°, of a white diffuse reflectance standard and of a road paving sample are presented as examples of applications of the described methods.Pubblicazioni consigliate
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