CAJ | 학술논문

研究了一种可用于工程结构状态监测的本征型强度调制光纤应变传感器，由两根以上多模光纤相互绞合形成，分析了该传感器的应变传感原理，得到其既能测量拉应变，又能测量压应变的结论.传感器对应变的响应具有良好的线性和重复性、灵敏度高、无迟滞现象.对钢筋拉应变、混凝土压应变的实验结果与理论分析一致，表明该传感器是适合土木工程测量、结构状态监测等方面的较为理想的光纤传感器.
연구료일충가용우공정결구상태감측적본정형강도조제광섬응변전감기，유량근이상다모광섬상호교합형성，분석료해전감기적응변전감원리，득도기기능측량랍응변，우능측량압응변적결론.전감기대응변적향응구유량호적선성화중복성、령민도고、무지체현상.대강근랍응변、혼응토압응변적실험결과여이론분석일치，표명해전감기시괄합토목공정측량、결구상태감측등방면적교위이상적광섬전감기.
This paper presents a novel intrinsic optical fiber strain sensor based on intensity modulation for structural states monitoring in civil engineering, whose sensing element is formed directly on the multi-mode fibers by twisting two or more fibers together. Compared with conventional phase interferometric optical fiber sensor and intensity modulated optical fiber microbending sensors, the advantages of this kind of twisting optical fiber sensor is evident: its configuration is very simple and its operation is very facile; it is easy fabricated and it is much sturdy and portable. Based on the mechanism of optical loss in microbending fibers and analysis of Material Mechanics, this paper analyses in detail the sensing principle of this new class fiber optic sensor and gives the diagram of the relationship of the loss of optical power and the axial strain on the sensor. The analysis and calculation shows that this kind of sensor can detect both tensile and compressive strains and stresses, and the response of twisting optical fiber sensor is of excellent linearity, repeatability, sensitivity, cyclic endurance and no measurable hysteresis. Based on above theoretic analysis and calculation, several optical fiber strain sensors are manufactured by twisting three common multi-mode fibers together and tested in detail. The experimental results in testing steel tension and concrete compression are in good agreement with theoretical analysis, and at the same time, the experiment also shows the good thermal stability of this kind of sensor. This new class fiber optic sensor is ideal for measuring and monitoring mechanical structures in smart civil engineering material and structures.