| 单词 | pencil beam |
| 释义 | > as lemmaspencil beam pencil beam n. a narrow beam of light or radiation; spec. a beam (typically of approximately circular cross-section) in which the individual rays (or paths of particles) are nearly parallel; cf. sense 6. ΘΚΠ society > communication > telecommunication > radio communications > [noun] > other methods or operations > radar > beam pencil beam1902 1902 R. Wilton Lyra Pastoralis 31 Hither, where cunning hands in glass have striven To shadow forth with pencil-beams of light, And colours deep and rich the Gospel-story. 1946 Jrnl. Inst. Electr. Engineers 93 iiia. 25/2 A Yagi aerial..presents the possibility of obtaining a ‘pencil’ beam of radiation, narrow in two perpendicular planes, from an end-fire array of comparatively small dimensions. 1955 Sci. Amer. Mar. 38/1 This antenna has a pencil beam which at a wavelength of 65 centimeters is five degrees wide. 1990 W. A. Livesey GCSE Motor Vehicle Stud. xv. 137/1 The spot light gives a long pencil beam, which is used to spot things a long way away, such as when driving down long straight roads. < as lemmas |
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