| 单词 | scanning electron microscope |
| 释义 | > as lemmasscanning electron microscope scanning electron microscope n. a form of electron microscope in which an electron beam is scanned in a raster pattern across the specimen; an electrical signal is obtained by collecting and amplifying secondary electrons emitted by the specimen and is applied to a cathode-ray tube scanned in synchronism with the electron beam; hence scanning electron micrograph, scanning electron microscopy. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > electron microscopes microscope1907 electron microscope1932 field emission microscope1941 field ion microscope1952 scanning electron microscope1953 SEM1968 stereoscan1968 transmission electron microscope1969 STM1982 1953 Proc. Inst. Electr. Engineers 100 ii. 246/2 The main advantage of the scanning electron microscope for transparent specimens is that the resolution is not affected by energy losses of the electrons in the specimen, which in the conventional electron microscope give rise to chromatic aberration. 1962 Nature 6 Oct. 82/1 Figs. 1 and 2 are scanning electron micrographs. 1966 D. G. Brandon Mod. Techniques Metallogr. 51 Image formation by..scanning electron microscopy. 1972 Sci. Amer. Jan. 55/2 The scanning electron microscope is capable of a range of magnifications that overlaps the range of the light microscope or hand magnifying glass at the low end and the range of the transmission electron microscope at the high end. 1975 J. I. Goldstein et al. in Goldstein & Yakowitz Practical Scanning Electron Microsc. i. 3 The purpose of this brief historical introduction is to point out the pioneers of scanning electron microscopy and in the process trace the evolution of the instrument. 1979 Sci. Amer. Sept. 30/3 Wonderful drawings..complemented by scanning electron micrographs. < as lemmas |
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