SHM of Concrete Using WISP

SHM of Concrete Using WISP

SHM of Concrete Using WISP

This research studies the feasibility of using commercial RFID wireless sensors, such as, the Wireless Identification and Sensing Platform (WISP) from Intel for monitoring decommissioned nuclear facilities filled with concrete and novel grouts for decommissioning of nuclear plants. After the decommissioning of the nuclear plant, the parameters of interest for continuous monitoring purposes will be temperature, humidity, and strain. However, even though nuclear decommissioning is the main application, many other applications in the civil engineering field can benefit from this study for monitoring temperature and strain in structures such as bridges, roads, and buildings. First, the electromagnetic properties of the grout were measured and modeled using the extended Debye material model. The same mathematical analysis used for concrete is used to assess the total losses suffered by a plane wave while traveling through grout. Specifically, this study calculated the total losses a plane wave experiences while propagating through building materials, such as, concrete and grout for entombment of nuclear plants. Second, the operational range inside which WISPs will continue to communicate with the reader were determined for different depths, t, for concrete and grout; and distance, d, between the RFID antenna and the material surface. Finally, the transmission coefficient,  between a commercial RFID antenna in the air and a WISP embedded inside concrete or grout were measured in order to establish the power transfer efficiency of the communication link. Also, these data offer important insight regarding the use of  WISPs inside lossy mediums different than air. This work is a first step in confirming the effective use of battery-less WISPs for monitoring of nuclear plants for decommissioning tasks and other civil engineering applications

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