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Related to reflectances: light reflectance


The ratio of the total amount of radiation, as of light, reflected by a surface to the total amount of radiation incident on the surface.


(rɪˈflɛktəns) or

reflection factor

(Units) a measure of the ability of a surface to reflect light or other electromagnetic radiation, equal to the ratio of the reflected flux to the incident flux. Symbol: ρ Compare transmittance, absorptance


(rɪˈflɛk təns)

the ratio of the intensity of reflected radiation to that of the radiation incident on a surface.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.reflectance - the fraction of radiant energy that is reflected from a surface
coefficient - a constant number that serves as a measure of some property or characteristic
References in periodicals archive ?
There was an obvious variation among the average reflectances during the leaf-growing period (from April 14 to May 16) in the NIR range, while little variation was observed in the visible range.
However, the difference in pore size between Recipes 4 and 5 is difficult to discern and their reflectances are similar.
Then the reflectances of the fire ant nest soil and surrounding soil were compared in the field.
We refer to both the gray and red surfaces as having reflectances of 20 percent, but what does this really mean?
As the estimate of the referent values of patches with unknown spectral reflectances, the mean values of spectral reflectance acquired with the spectrophotometer that showed the higest accuracy in the measurement of referent white patch was taken.
For the wavelengths lower than 500 nm reflectance values for samples soaked in fatty alcohol etoksylate solution are decreased, but for samples soaked in sodium lauryl ether sulfate and cocamidopropyl betaine solutions reflectances are increased in relation with aged original IQ office paper.
Spectral reflectances are measured either at the powder or the cure state.
The queries from the database, the extraction of pixels, and the calculation of average reflectances for the forests in the query were made by the program PixelWin (Lukk, 1999).
Because plant canopy reflectances in the visible (400700 nm) and NIR (700-900 nm) wavelengths are primarily influenced by chlorophyll and leaf cell structure, respectively (Campbell, 1996; Penuelas and Filella, 1998), changes in forage CP, NDE and ADF would be expected to affect canopy reflectance in given wavebands in visible-NIR region.
The alias selection method (23) can be employed to create random variates from these remaining specular reflectances
National Coatings products have been tested with the Cool Roof Rating Council (CRRC) and are listed as the highest reflective roof coatings available, with their AcryShield A590 and A179 listed with solar reflectances of 92% & 93% respectively.