| 单词 | crystal detector |
| 释义 | > as lemmascrystal detector crystal detector n. Electronics a detector that makes use of a crystal in some way; spec. (a) one that employs a crystal diode to rectify a high-frequency current, or to produce an audio signal from a radio signal (in early use typically consisting of a crystal of galena and a thin wire mounted so as to make point contact with it; cf. cat's whisker n. at cat n.1 Compounds 4a); (b) one used as a scintillation detector of X-rays or gamma rays. ΘΚΠ the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [noun] > detector resonator1883 detector1894 crystal detector1908 ratio detector1947 slope detector1958 1908 J. A. Fleming Elem. Man. Radiotelegr. Index 332 Crystal detectors. 1938 E. G. Richardson Physical Sci. Mod. Life ix. 190 Broadcast telephony can, if the signals are received at sufficient strength, be picked up by a crystal detector and a pair of headphones. 1957 T. R. Folsom in W. S. von Arx Proc. Symp. Deep-sea Res. x. 54 The cosmic background may not appear so conspicuously on a scintillometer. The practical consequence is that one can work closer to the sea surface with a crystal detector. 1959 Chambers's Encycl. XI. 475/1 The crystal detector..has found a new application in the field of radar. 2002 B. Croft et al. in J. Y. Gillenwater et al. Adult & Pediatric Urol. (ed. 4) I. iii. 187/2 A single crystal detector is usually mounted in..heavy-metal shielding so that the crystal is sensitive to x-rays or gamma rays from a localized region. 2005 J. Cazes & G. W. Ewing Ewing's Analyt. Instrumentation Handbk. (ed. 3) 372/1 A crystal detector rectifies the microwaves, producing a voltage that is subsequently amplified. < as lemmas |
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