How is diffuse reflectivity measured?
How is diffuse reflectivity measured?
Relative diffuse reflectance is measured by using an integrating sphere to measure the diffuse reflected light with specular reflected light excluded, as shown in Fig. 4-1. This is used to measure samples with a rough surface, such as paper.
What is diffuse reflectance UV VIS?
UV–Vis Diffuse Reflectance Spectroscopy is a widely used, basic spectrophotometric technique for the analysis of powders and surfaces, requiring a negligible sample preparation (Torrent and Barrón, 2008). It is based on the surface dispersion of a fraction of the UV–Vis incident radiation on it.
What is reflectance method?
Specular reflectance techniques basically involve a mirror-like reflection from the sample surface that occurs when the reflection angle equals the angle of incident radiation. It is used for samples that are reflective (smooth surface) or attached to a reflective backing.
What is diffuse reflectance spectroscopy used for?
Diffuse reflectance spectroscopy is a well-established technique for studying the spectral characteristics of opaque solid samples, based on the principle that not only does light reflected from the material come from the surface (specular reflection) but some is reflected internally (diffuse reflectance).
What is UV reflectance?
UV reflectance photography essentially is recording the UV radiation which is reflected back from a UV source. A UV source emits UV radiation, and this is often referred to as UV light. However UV light does not exist, since light is visible and UV is not!
How do you calculate average reflectance?
The weighted average of reflectance over the entire room surfaces, ρ′, can be expressed as follows:(2) ρ ‘ = ρ wall · A wall + ρ ceiling · A ceiling + ρ floor · A floor + ρ window · A window A where Awall, Aceiling, Afloor, and Awindow represent the surface area of wall (window area excluded), ceiling, floor, and …
What is a good LRV for exterior?
A good white exterior paint should have an LRV between 73-ish to 85. You can find the LRV of a paint color on the manufacturers website.