| 单词 | etalon |
| 释义 | étalon, etalon
(‖ etalɔ̃, ˈɛtəlɒn)
[F. étalon (Fabry & Pérot 1902, in Ann. de Chimie et Physique XXV. 107), lit. ‘a standard (of weights, measures, etc.)’:— OF. estalon, estelon prob. of Gmc. origin: see stallion.]
A device used to produce interfering beams of light, consisting essentially of two plane parallel reflecting plates of fixed separation and (in some kinds) adjustable orientation.
1905E. C. C. Baly Spectroscopy ix. 302 Fabry and Perot, profiting by their experience with their interferometer, have adopted fixed air layers as interference apparatus, the widths of which are determined once and for all. They call these apparatus standards (étalons). 1914Astrophysical Jrnl. XXXIX. 185 Interferometer, echelon grating, parallel interference-plates, etalon, etc. 1934Discovery July 184/1 The interferometer..is of the type known as the Fabry-Perot étalon, and in this particular form it consists of a metal tube having extremely flat and parallel end surfaces, to which are contacted polished flat plates of glass or natural quartz. 1963R. W. Ditchburn Light (ed. 2) ix. 358 A determination of the length of the shortest etalon in terms of the wavelength of the cadmium red line. |
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