光纤光栅孔隙水压力计的研制与应用研究

阐述了光纤Bragg光栅(FBG)技术的原理以及传感器的结构设计原理和方法,采用光纤Bragg光栅(FBG)传感技术研制了适合岩土工程使用的光纤光栅孔隙水压力计,对研制的6支光纤光栅孔隙水压力计进行了试验检验并埋设于某高速公路软土路基中试测孔隙水压力以检验研发成果。实践结果表明该仪器克服了常规仪器的某些缺点,并有稳定性好、耐腐蚀等优点,可以较好地应用于岩土工程监测当中。本仪器的研制对于光纤传感技术在岩土工程领域的应用具有积极的推动作用。

Development and Application of Fiber Optical Bragg Grating Pore-Water Pressure Sensors

The theory of fiber optical Bragg gating (FBG) and the theory and method of the sensor design are expounded. New sensors based on the technology of fiber optical Bragg grating are developed. 6 sensors are tested by experiments and then embedded in an expressway roadbed to detect the pore-water pressure for checking the developmental achievement. Experiments demonstrate that these sensors can overcome some defects of the traditional ones, and have their own advantages, such as good stability, corrosion resistance etc. So these sensors can be well used to monitor the soft soil foundation. The success of the sensor development promotes the application of fiber-sensing techniques in the field of geotechnical engineering.