单词 | schlieren illumination |
释义 | > as lemmasschlieren illumination attributive in plural. With reference to a method of observing and recording schlieren (sense 1) in a transparent medium or material (as in the flow of fluids of differing densities), in which the specimen is illuminated with a collimated beam of light and the diffraction pattern resulting from localized refraction is photographed or displayed on a screen; as schlieren illumination, schlieren method, schlieren photography, etc.The observation of schlieren is of particular use in the study of the flow of fluids of varying density. ΚΠ 1866 London, Edinb., & Dublin Philos. Mag. 4th Ser. 32 115 I imagined that by using the very ingenious arrangement which M. Toeppler has described in his paper, ‘Observations by a New Optical Method,’ under the name Schlierenapparatus, the mist could be still more readily perceived.] 1888 Proc. U.S. Naval Inst. 14 265 We will now quote a few experiments made by Toepler illustrating the sensitiveness of the Schlieren method. 1931 Trans. Inst. Mining Engin. 80 18 Experiments carried out with Schlieren photography at Buxton are being supplemented at the U.S. Bureau of Mines Explosives Station at Pittsburgh. 1956 Nature 10 Mar. 485/1 A schlieren system has been combined with a rotating mirror camera so that the shock propagation can be recorded in the regions outside the arc as well as in the arc channel. 1971 Sci. Amer. May 118/1 In its simplest form the schlieren apparatus consists of a light source, two lenses, a pair of knife-edges and a sheet of photosensitive film. 2006 Sci. News 169 219/1 Then, in the early 1990s, Weinstein figured out ways to make schlieren pictures without mirrors. 2016 T. Hübert et al. Sensors Safety & Process Control Hydrogen Technol. iii. 136 The schlieren method requires a stronger light source than shadowgraphy, but is more sensitive and gives an actual optical image through a lens. < as lemmas |
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