基于平行螺旋传输线的拉伸形变传感器研究
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摘要
在地质灾害监测领域,基于平行螺旋传输线的形变传感器可用于拉伸形变分布式测量,且可拉伸量大,其形变量与特性阻抗之间存在一定的函数关系。分析平行螺旋传输线的结构特征和工作机理,借助时域反射法(TDR)测量特性阻抗,通过电磁场原理和有限元仿真得出平行螺旋传输线特性阻抗和形变量之间的关系。实验显示平行螺旋传输线的特性阻抗与拉伸形变量之间存在指数关系,在时域反射仪的采样精度足够高且阶越信号上升时间足够短时,提出的方法可以用于实现准确的拉伸形变分布式测量。
In the field of geological hazard monitoring,deformation sensors based on parallel spiral transmission line can be used in tensile deformation distributed measurement,and the amount of stretching can be large,and there is a certain functional relationship between deformation magnitude and characteristic impedance. The structural characteristics and working mechanism of the parallel spiral transmission line are analyzed. Time domain reflectometry( TDR) is used to measure characteristic impedance. The relationship between characteristic impedance and deformation size of the parallel spiral transmission line is obtained by electromagnetic field principle and finite element simulation. The experiment shows there is an exponential relationship between the characteristic impedance and the tensile deformation of parallel spiral transmission line. If the sampling precision of time domain reflectometer is high enough and the rising time of the step signal is short enough,this method can be used to realize the accurate distributed measurement of tensile deformation.
In the field of geological hazard monitoring,deformation sensors based on parallel spiral transmission line can be used in tensile deformation distributed measurement,and the amount of stretching can be large,and there is a certain functional relationship between deformation magnitude and characteristic impedance. The structural characteristics and working mechanism of the parallel spiral transmission line are analyzed. Time domain reflectometry( TDR) is used to measure characteristic impedance. The relationship between characteristic impedance and deformation size of the parallel spiral transmission line is obtained by electromagnetic field principle and finite element simulation. The experiment shows there is an exponential relationship between the characteristic impedance and the tensile deformation of parallel spiral transmission line. If the sampling precision of time domain reflectometer is high enough and the rising time of the step signal is short enough,this method can be used to realize the accurate distributed measurement of tensile deformation.
引文
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[5]王渊,赵振刚,许俊飞,等.边坡光纤光栅监测与自适应卡尔曼滤波模型[J].传感器与微系统,2017,36(1):38-40.
[6] Tong R,Li M,Li Q. Study on elastic helical TDR sensing cable for distributed deformation detection[J]. Sensors,2012,12(12):9586-9602.
[7] Wang M,Wang Y,Jia S,et al. A positioning method of the partial stretch of spiral parallel cable[C]∥2016 International Conference on Energy Development and Environmental Protection,EDEP 2016,Beijing:DEStecb Publications,2016:570-575.
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