公开(公告)号：US20140147074A1

公开(公告)日：2014-05-29

申请号：US14169969

申请日：2014-01-31

Applicant: Weatherford/Lamb, Inc.

Inventor： John L. MAIDA, JR. ,  Alan D. KERSEY

IPC: G01L1/24

CPC classification number: G02B6/02314 ,  E21B47/123 ,  G01L1/242 ,  G01L1/245 ,  G01L1/246 ,  G01L11/025 ,  G02B6/021 ,  G02B6/022 ,  G02B6/02338 ,  G02B6/024 ,  G02B6/028 ,  G02B6/0281 ,  G02B6/262

Abstract: A side-hole optical cane for measuring pressure and/or temperature is disclosed. The side-hole cane has a light guiding core containing a sensor and a cladding containing symmetrical side-holes extending substantially parallel to the core. The side-holes cause an asymmetric stress across the core of the sensor creating a birefringent sensor. The sensor, preferably a Bragg grating, reflects a first and second wavelength each associated with orthogonal polarization vectors, wherein the degree of separation between the two is proportional to the pressure exerted on the core. The side-hole cane structure self-compensates and is insensitive to temperature variations when used as a pressure sensor, because temperature induces an equal shift in both the first and second wavelengths. Furthermore, the magnitude of these shifts can be monitored to deduce temperature, hence providing the side-hole cane additional temperature sensing capability that is unaffected by pressure. Additionally, the side-hole cane can be used to measure a differential pressure between a first pressure ported to the side-holes and a second external pressure.

Abstract translation: 公开了用于测量压力和/或温度的侧孔光学手杖。 侧孔拐杖具有包含传感器和包含基本上平行于芯延伸的对称侧壁的包层的导光芯。 侧孔在传感器的核心上产生不对称应力，产生双折射传感器。 传感器，优选布拉格光栅，反射与正交偏振矢量相关联的第一和第二波长，其中两者之间的分离度与施加在芯上的压力成比例。 当用作压力传感器时，侧孔手杖结构自我补偿并且对温度变化不敏感，因为温度在第一和第二波长两者中都产生相等的移动。 此外，可以监测这些位移的大小以推断温度，从而提供不受压力影响的侧孔拐角附加温度检测能力。 此外，侧孔手杖可用于测量端口与侧孔的第一压力和第二外部压力之间的差压。