Abstract
In this paper, the possibility of using coaxial cables asdistributed strain sensors by time domain reflectometry is studied.Analytical analysis is conducted on the relation between the distributedaxial strain and the change of characteristic impedance as well as on therelation between the change of characteristic impedance and the voltage ofthe reflected wave. The analysis leads to the establishment of the quantitativerelation between the distributed axial strains of a coaxial cable and thechange in the voltage of the reflected wave. It is demonstrated that thevoltage of the reflected wave can be used to measure the magnitude anddetermine the location of the axial strains in a coaxial cable.Furthermore, a good linearity is obtained when the axial strains are small.The investigation highlights the potential of coaxial cables as distributedstrain sensors. Finally, the existing problems for such sensors arediscussed.
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