Basis and application of GMR sensors for reinforced concrete elements
Steel reinforcement corrosion is a significant problem for the US infrastructure.Accurate and continuous corrosion sensing methods would help reduce this cost and enable effective health monitoring and service life prediction.In this paper the application of giant magneto-resistive response(GMR)sensors for corrosion sensing is studied.First the basis and design of GMR sensors are described.Then a new approach for corrosion sensing,based on magnetic field measurement with GMR sensor chips is proposed.In this approach,the existing corrosion state(thickness of corrosion product at steel surface)is monitored in an active sensing configuration that interrogates a nearby volume of material,while the existing corrosion rate is estimated using a passive configuration.Both active and passive approaches can be applied without excavation of the concrete,so remote sensing at a surface and internal sensing with an embedded unit are possible.The passive sensing configuration is described and experimental results from GMR sensors are presented.
Concrete corrosion magnetic sensing GMR
J.S. Popovics G. Gallo P.L. Chapman M. Shelton
Department of Civil & Environmental Engineering,University of Illinois,Urbana-Champaign,United State Department of Electrical & Computer Engineering,University of Illinois,Urbana-Champaign,United State
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）