埋设深度对路用光纤光栅传感器监测影响试验研究

发布时间：2018-05-22 14:56

本文选题：光纤光栅 + 埋设深度　；参考：《南京航空航天大学》2015年硕士论文

【摘要】：随着道路工程的发展,光纤光栅传感技术以其优良的性能,在道路工程得到了一些应用尝试研究,但是受道路工程施工的复杂性、粗放性、恶劣性等因素的制约,目前光纤光栅技术在道路工程中的实际应用还很少。本文针对光纤光栅传感器的不同埋设深度对传感器荷载监测灵敏度的影响进行试验研究。试验设计了以钢材封装的F型传感器和以聚丙烯封装的P型传感器。本文通过传感器拉伸标定试验、静载以及动荷载埋深试验,分析了传感器的封装、试验方法、以及埋设深度对传感器荷载监测灵敏度的影响。试验结果表明,两种传感器是可行有效的;两种封装材料对光纤光栅起到的增敏效果各不相同,两种传感器可以适用不同的监测要求。通过拉伸标定试验灵敏度系数折算,静载埋深试验得到了传感器的灵敏度系数随埋深的变化规律,不同封装的静载试验得到的变化规律也不同;静载试验方法不同,埋设深度对传感器灵敏度的影响规律也不同,说明试验方法对传感器的灵敏度有重大影响。动荷载埋深试验发现,方形静载标定的试验结果可以用于计算车辙仪动载,而圆形静载标定试验不能,说明静载试验标定方法对动载试验的验证计算结果有重大影响;在静载和动荷载相等时,传感器的波长变化量响应有一定的偏差;本文提出了用荷载差异系数来修正动荷载监测偏差,并研究了荷载差异系数与传感器埋设深度的关系,得到了荷载差异系数与埋深的关系公式和车轮荷载的实测荷载的计算公式。
[Abstract]:With the development of road engineering, fiber Bragg grating sensing technology has been applied in road engineering with its excellent performance. However, it is restricted by the complexity, extensive and evil of road engineering construction. At present, the practical application of fiber grating technology in road engineering is still few. In this paper, the influence of different embedding depth of fiber grating sensor on the sensitivity of sensor load monitoring is studied. F-type sensors encapsulated in steel and P-type sensors packaged in polypropylene were designed. In this paper, the effects of sensor encapsulation, test method and embedding depth on the sensitivity of sensor load monitoring are analyzed by means of sensor tensile calibration test, static load and dynamic load burying test. The experimental results show that the two kinds of sensors are feasible and effective, and that the two kinds of packaging materials have different sensitizing effects on fiber Bragg gratings, and the two kinds of sensors can be used for different monitoring requirements. Through the conversion of sensitivity coefficient of tensile calibration test, the variation of sensitivity coefficient with buried depth of sensor is obtained by static load burying test, and the variation law of static load test with different package is also different, and the static load test method is different. The influence of embedded depth on sensor sensitivity is also different, which indicates that the test method has great influence on sensor sensitivity. The dynamic load buried depth test shows that the square static load calibration test results can be used to calculate the dynamic load of the rutting instrument, but the circular static load calibration test cannot, which indicates that the static load test calibration method has a significant impact on the dynamic load test verification and calculation results. When the static load and the dynamic load are equal, the response of the wavelength variation of the sensor has a certain deviation, this paper proposes to correct the dynamic load monitoring deviation by the load difference coefficient, and studies the relationship between the load difference coefficient and the depth of the sensor embedding. The relationship between the load difference coefficient and the buried depth and the calculation formula of the measured load of the wheel load are obtained.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416

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