基于光纤传感技术的裂缝宽度监测方法

Crack Monitoring Based on Optical Fiber Sensing Technology

文中建立一种基于光频域反射(optical frequency domain reflection,OFDR)技术的裂缝宽度计算方法,可依据已知的光纤裂缝夹角,利用光纤测试位置-度计算精度影响,发现OFDR技术可实现毫米级裂缝监测与定位,较薄的黏接层及较大的裂缝夹角可提高裂缝识别灵敏度,而较窄的黏贴带可提高裂缝宽度计算准确性,并研究了在特定黏贴情况下的最优积分长度取值。

A method for crack width calculation based on optical frequency domain reflection(OFDR)technology is established.The fiber test position-strain curve integration can be used to calculate the crack width inversely with a specific crack angle.The relationship between optical fiber strain and crack width,crack angle and adhesive layout technology,and the influence of adhesive tape width on crack width calculation accuracy were explored through experiments.It is found that OFDR technology can achieve millimeter-level crack monitoring and localization.A thinner bonding layers and larger crack angles can improve crack detecting sensitivity,while a narrower bonding area provides higher accuracy in crack width calculation.In addition,the best integral length in a specific case was studied.