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

A. Hladio; D. Card; D. J. Thomson; G. E. Bridges; C. Klowak; A. Mufti

doi:10.1117/12.716940

26 April 2007 A passive wireless displacement sensor for structural health monitoring of civil structures

A. Hladio, D. Card, D. J. Thomson, G. E. Bridges, C. Klowak, A. Mufti

Proceedings Volume 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007; 653114 (2007) https://doi.org/10.1117/12.716940
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

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.

Citation Download Citation

A. Hladio, D. Card, D. J. Thomson, G. E. Bridges, C. Klowak, and A. Mufti "A passive wireless displacement sensor for structural health monitoring of civil structures", Proc. SPIE 6531, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2007, 653114 (26 April 2007); https://doi.org/10.1117/12.716940

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