新型光纤光栅渗压传感器及其在土木工程中的应用

基于光纤光栅传感原理研制出一种监测孔隙水压力的新型光纤Bragg光栅渗压传感器，并进行了室内标定和现场试验。该传感器可将过滤后进人传感器腔体的水压引起的光栅反射光波长的变化灵敏直观地显示出来，从而实现孔隙水压力的实时监测。与常规的电类检测仪器进行的对比试验表明：该传感器不仅能达到常规仪器的监测效果，而且具有绝对数值测量，抗干扰能力强，结构简单，长期稳定性高，能很好地实现对土木建筑结构的实时、在线监测等独特的性能，在土木工程界具有广泛的应用前景。

Novel Fiber optical Bragg Osmometer And Its Application Study in Civil Engineering

Based on the working principle of fiber Bragg grating (FBG) sensing,a novel instrument,fiber Bragg grating osmometer,is researched and developed to detect the pore-water pressure of the ground water through the indoor calibrations and field tests.The sensor can display the change of wavelength,which is caused by filtered water in the cavity of the sensor.Therefore,the sensor realizes real-time monitoring of pore-water pressure.The result of the experimental study,compared with common electrical detecting instrument,shows that the sensor not only can achieve the same effect of the conventional sensors,but also has some own distinctive virtues,such as measuring with absolute data,better anti-interference ability,simple structure and long-term stability,and it can realize real-time and on-line monitoring.The FBG sensor has an extensive application prospect in the civil engineering.