A PASSIVE WIRELESS DISPLACEMENT SENSOR FOR MONITORING CRACKS IN CIVIL STRUCTURES

被引：0
|
作者：
Card, D. [1 ]
Thomson, D. J. [1 ]
Bridges, G. E. [1 ]
Edalatmanesh, Rahman
Newhook, J.
机构：
[1] Univ Manitoba, Winnipeg, MB R3T 2N2, Canada
来源：
PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON STRUCTURE HEALTH MONITORING & INTELLIGENT INFRASTRUCTURE: STRUCTURAL HEALTH MONITORING & INTELLIGENT INFRASTRUCTURE | 2007年
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D O I：
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中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
A passive wireless crack width 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 in the resonant frequency of the cavity that is directly related to the displacement of the rod. In the example shown, the shift is similar to 4-5 MHz per mm for a cavity with a resonant frequency of 2410 MHz. Using a pulse echo interrogation technique resonant shifts of 100 kHz or 0.022 mm are resolvable. Sensors were mounted onto concrete test prisms and cycled from 20C to -20C. Over this temperature range thermally induced changes of 0.0045 mm/C were observed.
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页数：7
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