A surface will be perceived as white if the albedo is greater than 0.8.
On the contrary, it will be perceived as black if the albedo is less than 0.03.
Pyranometer used to measure solar radiation
Measurement of albedo in the laboratory
Measures in accordance with standards NF-EN 4593, ASTM-E903 and G173
Spectral characterization from 200 to 2500 nm
Frontier Perkin-Elmer UV-Vis-NIR Spectrometer with Integral Sphere
Possibility of differentiation between diffuse and specular reflection Albedo values from 0 to 100%
Calculation of measurement uncertainty applications
Characterization of solid materials
- Surface coatings Areas
- Génie civil
On site albedo measurement
The following figure is from standard E1918-06. The principle is to measure the incident solar flux with a pyranometer and then rotate it by 180 ° to measure the reflected flux. The measurement must be made in a fixed time because the pyranometers have relatively slow response times.
This method is essential for measuring the albedo of heterogeneous surfaces in the field, such as soils or ground vegetation.
Measurement of albedo according to ASTM E1918-06