A passive wireless displacement sensor for structural health monitoring of civil structures

被引:0
|
作者
Hladio, A. [1 ]
Card, D. [1 ]
Thomson, D. J. [1 ]
Bridges, G. E. [1 ]
Klowak, C. [2 ]
Mufti, A. [2 ]
机构
[1] Univ Manitoba, Dept Elect & Comp Engn, Winnipeg, MB R3T 2N2, Canada
[2] Univ Manitoba, ISIS, Dept Civil Engn, Winnipeg, MB R3T 2N2, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
wireless; sensor; displacement; RF; resonant cavity; passive;
D O I
10.1117/12.716940
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
A passive wireless displacement sensor suitable for use in civil structural health monitoring applications is presented. The sensor is based on a resonant electromagnetic cavity with one end of the cavity formed by a flexible membrane. A rod attached to the membrane causes the dimensions of the cavity to change when the rod is displaced. The change in dimensions causes a shift the resonant frequency of the cavity that is directly related to the displacement of the rod. In the example shown the shift is 7 MHz per mm for a cavity with a resonant frequency of 2450 MHz. Using a pulse echo interrogation technique resonant shifts of 100 kHz are resolvable. In the laboratory, displacements of 0.014 mm were measurable, with the distance between the interrogator and the sensor of up to 4.5 m.
引用
收藏
页数:7
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