| 释义 |
reticle|ˈrɛtɪk(ə)l|
[ad. L. rēticulum, dim. of rēte net: cf. reticule.]
†1.
a. ‘A little net, or casting net.’ Obs.
1656Blount Glossogr.
†b. A structure resembling a net. Obs. rare—1.
1790Phil. Trans. LXXXI. 23 The texture of animal and vegetable fibrous substances must be a sort of reticle.
2. A set of parallel wires, threads, etc., with others intersecting them at right angles, or of lines similarly ruled upon a sheet of glass, placed in the object-glass of a telescope, in order to facilitate accurate observations.
1731Bailey, vol. II. (ed. 2), Reticula, Reticle,..a contrivance for the exact measuring the quantity of eclipses. 1797Encycl. Brit. (ed. 3) II. 590 In the common focus of the object-glass and eye-glass is placed a reticle..consisting of three horizontal and parallel fine-stretched silver wires,..with a fourth vertical wire..passing through the centre. 1829W. Pearson Pract. Astron. II. 133 La Lande has called reticles (reticules) the most simple kind of micrometer. 1879Newcomb & Holden Astron. 76 The reticle is a network of fine spider lines placed in the focus of the objective [of a telescope]. 1890Anthony's Photogr. Bull. III. 155 To detect shrinkage of the film, we impress the image of a reticle ruled in squares, on the negative before exposure, and, on development, we have these squares displayed.
3. A disc or the like with a pattern of opaque and transparent portions which can be rotated in the path of a beam of light or other radiation so as to modulate it.
1959Proc. IRE XLVII. 1566/2 The particular space-filtering properties associated with typical picket fence, checkerboard, and star reticles, as they operate in square or circular field stops, are shown in Figs. 5 and 6. 1961Jrnl. Optical Soc. Amer. LI. 1011/1 In the detection of infrared radiation, it is common practice to interrupt the incident beam periodically to produce an alternating signal for electronic processing. The means used to accomplish this is usually a multisectored spinning aperture called a reticle. 1966L. M. Biberman Reticles in Electro-Optical Devices iii. 30 A simple reticle providing ‘two-level’ phase modulation is shown... If a small image is focused upon such a rotating reticle, the reticle can provide an indication of the radial position of that image by means of the phase information in the pulses of transmitted radiation. |