【摘要】 提出了一种新型的利用光纤光栅传感器进行管线弯曲变形检测的方法。将两根布拉格光纤光栅成90°粘贴在一种细径弹性基材上,形成直径5 mm的弯曲变形测量传感器。然后将传感器封装在特殊的定心机构里面,初步解决了传感器检测过程中的定心和卸载问题。通过标定,得到两根布拉格光纤光栅中心波长变化值与传感器弯曲曲率的比例系数分别为524.0 733 和485.7 432。定心机构带动传感器沿被检测管线间歇式前进,在前进过程中,用光纤光栅解调仪每隔50 mm等间隔点上采样传感器的波长读数,经计算得到相应各点的应变和空间曲率信息。然后运用基于等距离离散点曲率信息的空间曲线重建方法重建出管道的空间位置形状。更多还原

【Abstract】 A new method of using FBG sensor for detection of pipelines is proposed. First, two Fiber Bragg Gratings(FBGs) are mounted on a slim cylindrical substrate in 90° to make a strain detecting sensor with a diameter of 5 mm. Then the sensor is placed in a novel design centering clamping device to deal with the centering and longitudinal force unload problem. By the demarcate method, two coefficients between the two FBGs Bragg wavelength change and the curvature of sensor can be calculated, and the two coefficients are 524.0 733 and 485.7 432. While the centering clamping device drives the sensor to move along the pipeline step by step, the data of Bragg wavelength of the sensor is picked up by demodulator every 50 mm equidistance points. Space curvature information of each point can be calculated from these data. At last, the location and 3D shape of the pipeline is reconstructed by the use of the space curve fitting method, which is based on curvature information of discrete points.更多还原