英语词汇“pencil beam”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

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.

单词	pencil beam
释义	> as lemmas pencil 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. extracted from penciln. < as lemmas
随便看	do one's diligence do one's dinger do one's do do one's doings do one's duty do one's ease do one's easement do one's easter do one's endeavour(s do one's face do one's fair share do one's filthhead do one's fine do one's force do one's homework do one's honour to do one's kind do one's labour do one's main do one's manners do one's merchandise do one's might do one's nana do one's nature do one's needs

> as lemmas