| 释义 |
absorptance, n. Physics.|əbˈzɔːptəns|
[f. L. absorpt- (see absorpt ppl. a.) + -ance, after reflectance n., etc.]
The proportion of incident radiation absorbed by a surface or object.
1934in Webster. 1937W. E. Forsythe Measurem. Radiant Energy i. 23 If..none of the radiation is transmitted, the incident radiation..is equal to the sum of the part absorbed and the part reflected... If ϕ is the incident radiant flux, ϕ = ρϕ + αϕ or 1 = ρ + α where ρ is the reflectivity and α the absorptance of the material. 1978Nature 14 Sept. 95/2 Proprietary coatings include various Ni / Cr oxides/sulphides, which can have solar absorptances of up to 0.98 and infrared emittances of less than 0.2. 1986C. P. Lo Appl. Remote Sensing v. 199 The behaviour of infrared reflectance or absorptance is largely dependent on the optical characteristics of the air-water interface within the cells. |