翻訳と辞書 Words near each other ・ Distribution fitting ・ Distribution frame ・ Distribution function ・ Distribution law ・ Distribution learning theory ・ Distribution list ・ Distribution management system ・ Distribution Media Format ・ Distribution network operator ・ Distribution of Heliamphora ・ Distribe ・ Distribuidor Vial San Antonio ・ Distributary ・ Distribute Surveillance System ・ Distributed Access Control System ・ Distributed acoustic sensing ・ Distributed Active Archive Center ・ Distributed active transformer ・ Distributed algorithm ・ Distributed algorithmic mechanism design ・ Distributed amplifier ・ Distributed Annotation System ・ Distributed Annotation System/Clients ・ Distributed antenna system ・ Distributed AOP ・ Distributed Application Specification Language ・ Distributed architecture for mobile navigation ・ Distributed Art Publishers ・ Distributed artificial intelligence ・ Distributed Bragg reflector Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Distributed acoustic sensing ： ウィキペディア英語版 Distributed acoustic sensing Rayleigh scattering based distributed acoustic sensing (DAS) systems use fiber optic cables to provide distributed strain sensing. In DAS, the optical fiber cable becomes the sensing element and measurements are made, and in part processed, using an attached optoelectronic device. Such a system allows acoustic frequency strain signals to be detected over large distances and in harsh environments. ==Fundamentals of Rayleigh scatter based fiber optic sensing== In Rayleigh scatter based distributed fiber optic sensing, a coherent laser pulse is sent along an optic fiber, and scattering sites within the fiber cause the fiber to act as a distributed interferometer with a gauge length approximately equal to the pulse length. The intensity of the reflected light is measured as a function of time after transmission of the laser pulse. When the pulse has had time to travel the full length of the fiber and back, the next laser pulse can be sent along the fiber. Changes in the reflected intensity of successive pulses from the same region of fiber are caused by changes in the optical path length of that section of fiber. This type of system is very sensitive to both strain and temperature variations of the fiber and measurements can be made almost simultaneously at all sections of the fiber. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Distributed acoustic sensing」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.