| 单词 | split beam |
| 释义 | > as lemmassplit beam split beam n. a beam (of radiation, etc.) that has been split into two or more components, spec. as used in a radar technique in which a single aerial transmits alternately two beams slightly displaced from each other in order accurately to obtain the direction of a target; frequently attributive. ΘΚΠ the mind > attention and judgement > discovery > instrument for detection > [noun] > radar system > wave or beam echo1944 split beam1947 1947 J. G. Crowther & R. Whiddington Sci. at War 25 This ‘split-beam’ method of direction-finding gives very accurate results. 1966 D. Taylor Introd. Radar ii. 24 Special stations..with facilities for ‘split-beam’ d.f. [sc. direction finding] were provided for accurate tracking of ships and fire-control purposes. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) II. 594 d/1 The split-beam spectrophotometer..measures the difference in absorption at any given wavelength between two nearly identical cell suspensions. 1978 R. V. Jones Most Secret War xlii. 397 The method was to set a Freya station on the coast of France so that its split-beam pointed over the target in London. < as lemmas |
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