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裸光纤光栅与电阻应变计相比具有体积小、防水、抗电磁干扰等优点,利用其在高压孔隙水环境下进行应变测试理论上是可行的。以相关课题试验研究为背景,进行了高孔隙水压下裸光纤光栅应变测试的研究。首先通过试验研究,根据裸光纤光栅应变灵敏度系数与长期稳定性选择合适的胶黏剂,在此基础上利用裸光纤光栅对高孔隙水压力下的模型井壁外缘切向应变进行测量,通过与井壁内缘的电阻应变计测值对比发现,二者测值非常接近,试验表明高水压下裸光纤光栅应变测试是可行的,具有足够的灵敏度与精度,同时发现粘贴工艺的标准化、胶黏剂的选择以及裸光纤光栅的存活率是影响测试成败的重要因素。
Bare fiber grating compared with the resistance strain gauge has the advantages of small size, waterproof, anti-electromagnetic interference, the use of its high pressure pore water environment strain test theoretically feasible. Based on the related experimental research, the strain measurement of bare FBG under high pore pressure is studied. First of all, through the experimental study, the appropriate adhesive is selected according to the strain sensitivity coefficient and long-term stability of the bare FBG. On this basis, the measurement of the tangential strain at the outer wall of the borehole wall under high pore water pressure is carried out by using the bare FBG. Compared with the measured value of resistance and strain gauge at the inner edge of the borehole wall, it is found that the measured values of the two are very close. The tests show that the strain measurement of bare fiber grating under high water pressure is feasible, with sufficient sensitivity and precision. At the same time, The choice of adhesive and the survival rate of the bare FBG is an important factor affecting the test success.