赤水旅游攻略专利名称：Method and apparatus for optical nsing 发明人：Mahmoud Farhadiroushan,Tom Richard Parker,Sergey Shatalin
南瓜饭的做法大全申请号：GB202113964吃什么护肝养肝
孕妇吃什么水果最好茶瓣申请日：20160307网购入门
公开号：GB2596257B
公开日：
20220608
小炒王专利内容由知识产权出版社提供
摘要：Embodiments of the invention provide an improved optical fiber distributed acoustic nsor system that makes u of a specially designed optical fiber to improve overall nsitivity of the system, in some embodiments by a factor in excess of 10. This is achieved by inrting into the fiber weak broadband reflectors periodically along the fiber. The reflectors reflect only a small proportion of the light from the DAS incident thereon back along the fiber, typically in the region of 0.001% to 0.1%, but preferably around 0.01% reflectivity per reflector. In addition, to allow for temperate compensation to ensure that the same reflectivity is obtained if the temperature changes, the reflection bandwidth is relatively in the region of +/- 3nm from the nominal lar wavelength. In some embodiments the reflectors are formed from a ries of fiber Bragg gratings, each with a different center reflecting frequency, the reflecting frequencies and bandwidths of the gratings being lected to provide the broadband reflection. In other embodiments a chirped grating may also be ud to provide the same effect. In preferred embodiments, the reflectors are spaced at half the gauge the desired spatial resolution of the optical fiber DAS.
郭金辉
申请人：Silixa Ltd.
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