| 释义 |
decentre, v.|diːˈsɛntə(r)|
Also decenter.
[f. de- + centre n. or v.]
1. trans. To remove the centre from (in quot., centre n. 13).
1870Engineering X. 485/1 In 1847, M. Beaudemoulin..made use of sand in decentering arches.
2. To place out of centre; to render eccentric; spec. in Optics (see quot. 1889). So deˈcentrated ppl. a.; decenˈtration; deˈcent(e)red ppl. a.; deˈcent(e)ring vbl. n. and ppl. a.
1889E. E. Maddox Clinical Use of Prisms ii. 45 A lens is said to be normally centred when the optical and geometrical centres coincide..but to be decentred when, as in Fig. 21, the optical centre O, and the geometrical centre G, are apart. Ibid. 47 The word ‘decentering’ is generally applied to the removal of the optical centre away from the geometrical centre of the lens. Ibid. 49 The dislocation of the optical centre..to be obtained by decentration proper, that is by decentering the lens in its rim. 1909Cent. Dict. Suppl., Decentrated. 1946A. Huxley Let. 26 Oct. (1969) 551 Too much concentration defeats its own end, and..effective concentration has to work by a process of decentration. 1962L. S. Sasieni Optical Dispensing v. 126 The right lens may be decentred out and the left lens decentred inwards. Ibid., The amount of decentration produced by the asymmetry..is..likely to have appreciable prismatic effect. 1964Yearbook Astr. 1965 96 The stresses..tend to de-centre the secondary, making it move off the optical axis. |