| 单词 | ray filter |
| 释义 | > as lemmasray filter ray filter n. †(a) a substance that is transparent to non-luminous electromagnetic radiation but opaque to visible light (obsolete); (b) a filter that only lets light of certain wavelengths through. ΚΠ 1865 J. Tyndall in Proc. Royal Soc. 14 476 In the 3rd section is described a mode of filtering the composite radiation of an intensely luminous source so as to detach the luminous from the non-luminous portion of the emission... The eminent fitness of a combination of iodine and bisulphide of carbon as a ray-filter is illustrated. 1882 Proc. Royal Soc. 34 64 A solution of chromate of potash is particularly well suited for a ray filter when the object is to discharge the phosphorescence of sulphide of calcium. 1903 Bot. Gaz. 36 31 In studying the preparations glass globes, filled with various solutions, served as ray filters and condensers. 1937 Science 13 Aug. 5/2 The use of sodium vapor..as a kind of natural ray filter for the light of distant stars and galaxies. 1944 Biol. Bull. 87 191 An achromatic condenser and a concentrated filament lamp, with ground-glass ray-filter and an iris diaphragm. < as lemmas |
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