| 释义 |
▪ I. † lux, v. Obs.
[ad. F. luxer, ad. L. luxāre: see luxate v.]
= luxate v. Hence ˈluxing vbl. n.
1708J. Philips Cyder ii. 488 The fall Luxt his neck-joint. 1725Pope Odyss. xi. 80 Staggering I reel'd, and as I reel'd I fell, Lux'd the neck-joint. 1775Ash, Suppl., Luxing, the act of putting out of joint.
▪ II. lux, n. Physics.|lʌks|
Pl. lux.
[L., = ‘light’.]
A unit of illumination (now incorporated into the International System of Units) equal to the illumination of a surface all of which is one metre from a uniform point source of light of unit intensity (now one candela), i.e. (as now defined) one lumen per square metre.
1889Engineering 13 Sept. 313/1 Mr. Preece was not..fortunate with his unit of surface illumination, the ‘lux’ being the illumination produced by a lamp of one Carcel power at a distance of one metre, which is practically the same illumination as that afforded by an English standard candle at a distance of 1 ft... It is probable, sooner or later, that such a unit will be adopted. 1897Jrnl. Inst. Electr. Engin. XXVI. 638 It was proposed by the Committee of the International Congress of Geneva that M. A. Blondel should present a report, with..a complete system of defining the dimensions and units of photometry... This report was submitted for examination of a commission..and was accepted... Lux = Lumen/Square metre. 1911A. P. Trotter Illumination ii. 17 Sir William Preece..adopted the Carcel-metre, and he showed that it was equal to a standard candle of 1·058 foot. At the Paris Electrical Congress of 1889 he adopted the name ‘lux’ for this... The unit of illumination produced by a bougie-décimale at a metre has been called a bougie-metre, and the name ‘lux’ was revived at the Geneva Congress of 1896 and was applied to this unit... This lux is, roughly, one-twelfth of a foot-candle, or about one-fourteenth of Preece's lux. The illumination produced by a Hefner at a metre has also been called a ‘lux’, and it seems probable that the International candle at a metre may be called an International lux. 1927Forestry I. 87 Experiments carried out..in a light intensity of 48,000 lux. Ibid., The lux is a light intensity produced by a light of one candle-power at a distance of one metre. Forty-eight thousand lux is roughly equivalent to full sunlight at noon in midsummer in Germany. 1953Amos & Birkinshaw Television Engin. I. 279, 1 lux = 1 lumen per square metre = 0·0929 foot-candle. 1970Nature 26 Dec. 1349/2 On many days during the growth of these plants light intensities reached 80,000 lux.
▪ III. lux
obs. variant of luxe. |