| 单词 | thermionic tube |
| 释义 | thermionic tube (extremely rare) n WORD FAMILY thermionic tube n electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope Syn|Hypo|Hyper electron tube, thermionic vacuum tube, thermionic valve, tube, vacuum tube acorn tube a small vacuum tube; used at high frequencies diode, rectifying tube, rectifying valvea thermionic tube having two electrodes; used as a rectifier electron multipliera vacuum tube that amplifies a flow of electrons gas-discharge tubea tube in which an electric discharge takes place through a gas klystronan electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation magnetrona diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators pentodea thermionic tube having five electrodes television pickup tube, television-camera tubea tube that rapidly scans an optical image and converts it into electronic signals tetrodea thermionic tube having four electrodes triodea thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible X-ray tubea vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays CRT, cathode-ray tubea vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen glow lampa gas-discharge tube with a hot cathode; used in stroboscopes glow tubea gas-discharge tube consisting of a cold cathode and a diode in a tube filled with gas; the color of the glow depends on the particular gas iconoscopethe first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin image orthicon, orthicona now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons electronic device a device that accomplishes its purpose electronically |
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