CAJ | 학술논문

为了监测紧凑结构件的内部层间压力,提出一种采用新型材料保偏光子晶体光纤为敏感单元的嵌入式压力在线检测技术。建立了传感模型,采用Sagnac干涉技术组建检测系统,并进行了实验研究。通过实验验证,检测系统输出干涉峰值的移动量与光纤横向压力成线性关系,传感器可检测压力范围为0~10 kN,压力灵敏系数为0.4414 nm/kN,传感器精度2.6%,且能明显观测到光纤上方垫层材料的松弛效应。试验验证敏感单元的重复性能良好,且温度敏感系数仅为-11.8 pm/℃,使得该类传感器具有良好的抗温度干扰性及工程实际应用性。
위료감측긴주결구건적내부층간압력,제출일충채용신형재료보편광자정체광섬위민감단원적감입식압력재선검측기술。건립료전감모형,채용Sagnac간섭기술조건검측계통,병진행료실험연구。통과실험험증,검측계통수출간섭봉치적이동량여광섬횡향압력성선성관계,전감기가검측압력범위위0~10 kN,압력령민계수위0.4414 nm/kN,전감기정도2.6%,차능명현관측도광섬상방점층재료적송이효응。시험험증민감단원적중복성능량호,차온도민감계수부위-11.8 pm/℃,사득해류전감기구유량호적항온도간우성급공정실제응용성。
In order to monitor inter layer pressures in especial compact structure,an on-line and embedded pressure monitoring method is proposed using a new type of material as sensing element,that is polarization-maintaining pho-tonic crystal fiber( PM-PCF) . Sensing model is analyzed and measurement system based on Sagnac interferometer is set up to do the calibration experiments. The experiment results show that the output interference fringes of measure-ment system are shifted linearly with pressures,the dynamic range of sensor is 0~10 kN,sensing precision is 2.6%, pressure sensitivity is 0.441 4 nm/kN,the strain relaxation phenomenon of cushion on the PM-PCF can be observed obviously,and the good repeatability of sensing element is validated by the experiment. The sensor has better engi-neering practicability and capability to restrain interference brought up by fluctuation of environment temperature, which temperature sensitivity is only -11.8 pm/℃.