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・ Phase response
・ Phase response curve
・ Phase retrieval
・ Phase rule
・ Phase shaped binary transmission
・ Phase shift module
・ Phase space
・ Phase Space (album)
・ Phase space (disambiguation)
・ Phase Space (story collection)
・ Phase space formulation
・ Phase space method
・ Phase spider
・ Phase splitter
・ Phase Stretch Transform
Phase switch
・ Phase synchronization
・ Phase telescope
・ Phase Three
・ Phase transformation crystallography
・ Phase transition
・ Phase transitions and critical phenomena
・ Phase variation
・ Phase velocity
・ Phase VII
・ Phase vocoder
・ Phase-boundary catalysis
・ Phase-change Dual
・ Phase-change incubator
・ Phase-change material


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Phase switch : ウィキペディア英語版
Phase switch

A phase switch is a device used to increase the discrimination and sensitivity of an interferometer, especially at radio frequencies; an extra half-wave path difference is switched in, at well defined frequency, between the two interfering signal sources. In-phase signals then become out of phase and vice versa, so that the signal output becomes modulated by the switching frequency, and can be more easily filtered from the internally generated noise. (The discrimination is highest for sources which are small compared with the interferometer-fringe spacing)
Its use in radio astronomy is generally credited to Martin Ryle, and used extensively in the 1C radio survey.



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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