| 单词 | sky screen |
| 释义 | > as lemmassky screen sky screen n. a sensor consisting of one or more photocells which uses variations in the amount of light reaching the cells to detect the passage of an airborne body (esp. a bullet) and measure its velocity; cf. screen n.1 4. ΘΚΠ the mind > attention and judgement > discovery > instrument for detection > [noun] > electronic > used for specific purpose gas detector1865 hydrostat1871 kinesiscope1893 leak detector1921 mine detector1943 sky screen1945 heat-seeker1956 the world > physical sensation > sight and vision > optical instruments > instruments for projecting image > [noun] > visual display units > to record or detect travel through sky sky screen1945 1945 in L. E. Simon German Sci. Establishments (1947) (PB Rep. No. 19849) ii. ii. 48 One thing that was particularly notable was a large number of photoelectric ‘sky screens’. 1969 New Scientist 2 Oct. 25/3 The accuracy of the sky screens is said to be two metres in azimuth, and 1.5 metres in elevation. 2016 Proc. 29th Internat. Symp. Ballistics 2 2318 The impact velocity of the projectile was measured with a pair of sky screens spaced 2m apart. < as lemmas |
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