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1. 发明申请

WO2018127708A1 METHOD AND APPARATUS FOR OPTICAL SENSING 审中-公开
公开(公告)号：WO2018127708A1
公开(公告)日：2018-07-12
申请号：PCT/GB2018/050027
申请日：2018-01-05
申请人： SILIXA LTD. , CHEVRON U.S.A. INC.
发明人： SHATALIN, Sergey , DAJCZGEWAND, Julian , FARHADIROUSHAN, Mahmoud , PARKER, Tom
IPC分类号： G01D5/353 , G01H9/00
摘要： Embodiments of the invention provide an improved optical fiber distributed acoustic sensor system that makes use of an optical fiber having reflector portions distributed along its length in at least a first portion. In particular, in order to increase the spatial resolution of the sensor system to the maximum, the reflector portions are positioned along the fiber separated by a distance that is equivalent to twice the distance an optical pulse travels along the fiber in a single sampling period of the data acquisition opto-electronics within the sensor system. As such, no oversampling of the reflections of the optical pulses from the reflector portions is undertaken, which means that it is important that the sampling points for data acquisition in the sensor system are aligned with the reflections that arrive at the sensor system from along the sensing fiber. In order to ensure such alignment, adaptive delay componentry may be used to adaptively align the reflected optical signals (or their electrical analogues) with the sampling points. Alternatively, control over the sampling points can also be undertaken to re-synchronise the sampling points with the returning reflections. In addition, in order to allow higher speed sampling to be undertaken, reflection equalisation componentry may also be used to reduce the dynamic range of the returning reflections.

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