| 释义 |
radiance|ˈreɪdɪəns|
Also 7 radience.
[ad. late or med.L. radiantia brightness: see radiate v. and -ance.]
1. a. Light shining with diverging rays; hence, brilliant light, vivid brightness, splendour.
1601Shakes. All's Well i. i. 99 In his bright radience and colaterall light, must I be comforted. 1605― Lear i. i. 111 By the sacred radience of the Sunne. 1667Milton P.L. vii. 194 The Son..with radiance crown'd Of majesty divine. 1728–30Thomson Spring 191 The rapid Radiance instantaneous strikes Th' illumin'd Mountain. 1795Southey Joan of Arc vi, Innocuous lightnings round the hallowed banner Wreath'd their red radiance. 1812J. Wilson Isle of Palms i. 214 Well may the moon delight to shed Her softest radiance round that head. 1874H. R. Reynolds John Bapt. i. 11 When the sun arose the morning star was lost in his radiance.
fig.1761Warton Poems (1777) 10 The radiance of the regal name. 1822B. Cornwall Misc. Poems, The soul's radiance in a wintry hour Flings a sweet summer halo round us. 1896Mrs. Caffyn Quaker Grandmother 13 It was a soft, luminous radiance of sincerity and sympathy.
b. Brightness of the eye or look.
1748Thomson Cast. Indol. ii. lxxii, Sweet love their looks a gentle radiance lends. 1769Sir W. Jones Palace of Fortune in Poems (1777) 8 The mild radiance of her sparkling eye. 1863Geo. Eliot Romola ii. iv, There was a radiance of satisfaction about him not quite usual.
2. = radiation.
1800Herschel in Phil. Trans. XC. 294 The..agency of heat in other circumstances than in its state of radiance, or heat-making rays. 1885Clerk Maxwell in Encycl. Brit. XIX. 2 Thus we have..(3) Theory of radiance. (a) Geometrical optics [etc.].
3. The radiant flux emitted by unit area of a source into unit solid angle.
1917H. E. Ives in Astrophysical Jrnl. XLV. 43 If now we divide this radiant intensity in any direction by the projected area of the opening in that direction.., we obtain the specific radiant intensity or radiance in that direction. Ibid. 48 ‘Radiance’, as a time-saving word for ‘specific radiant intensity’, is frankly taken from the dictionary, as the appropriate synonym for ‘brightness’. 1944Jrnl. Optical Soc. Amer. XXXIV. 253/2 The luminance of any surface is the product of the radiance of that surface by the absolute luminosity K of the energy radiated by the surface. 1951[see luminosity curve]. 1972Science 22 Sept. 1100/1 Radiance gradients determined from data gathered by the infra⁓red spectrometers aboard the Nimbus III and Nimbus IV satellites. |