| 单词 | sector scanning |
| 释义 | > as lemmassector scanning sector scanning n. scanning with radar, sonar, or the like in which the detector rotates to and fro through a fixed angle. ΚΠ 1946 Princ. & Applic. of Underwater Sound (U.S. Nat. Defense Res. Comm.) (1968) xi. 213/1 A plan position indicator is..required for sector scanning, the CRO spot..tracing a synchronous map of the motion of the active region. 1969 R. P. Selby in C. J. Richards Mech. Engin. in Radar & Communications ix. 386 It is sometimes required to move an antenna system about a vertical axis in an oscillatory mode (sector-scanning), thereby turning the antenna through a limited arc in either direction. 1974 Y. Kikuchi in G. W. Stroke et al. Ultrasonic Imaging & Holography 267 Asberg has been proposing a high speed sector scanning of a focusing mirror system receiver for obtaining an ultrasonic cinematogram of the living heart. 1977 Navy News July 18/2 Because the number of wrecks on our continental shelf is so high..modern equipment such as Hydrosearch—the British sector-scanning surveying sonar—is particularly needed. < as lemmas |
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