Show simple item record

dc.contributor.authorMelik, R.en_US
dc.contributor.authorUnal, E.en_US
dc.contributor.authorPerkgoz, N.K.en_US
dc.contributor.authorPuttlitz, C.en_US
dc.contributor.authorDemir, H. V.en_US
dc.date.accessioned2016-02-08T12:20:40Z
dc.date.available2016-02-08T12:20:40Z
dc.date.issued2010en_US
dc.identifier.urihttp://hdl.handle.net/11693/28438
dc.description.abstractApproximately 10% of the fractures do not heal properly because of the inability to monitor fracture healing. Standard radiography is not capable of discriminating whether bone healing is occurring normally or aberrantly. We propose and develop an implantable wireless sensor that monitors strain on implanted hardware in real time telemetrically. This enables clinicians to monitor fracture healing. Here we present the development and demonstration of metamaterial-based radiofrequency (RF) micro-electro-mechanical system (MEMS) strain sensors for wireless strain sensing to monitor fracture healing. The operating frequency of these sensors shifts under mechanical loading; this shift is related to the surface strain of the implantable test material. In this work, we implemented metamaterials in two different architectures as bio-implantable wireless strain sensors for the first time. These custom-design metamaterials exhibit better performance as sensors than traditional RF structures (e.g., spiral coils) because of their unique structural properties (splits). They feature a low enough operating frequency to avoid the background absorption of soft tissue and yield higher Q-factors compared to the spiral structures (because their gaps have much higher electric field density). In our first metamaterial architecture of an 5x5 array, the wireless sensor shows high sensitivity (109kHz/kgf, 5.148kHz/microstrain) with low nonlinearity-error (<200microstrain). Using our second architecture, we then improved the structure of classical metamaterial and obtained nested metamaterials that incorporate multiple metamaterials in a compact nested structure and measured strain telemetrically at low operating frequencies. This novel nested metamaterial structure outperformed classical metamaterial structure as wireless strain sensors. By employing nested metamaterial architecture, the operating frequency is reduced from 529.8 MHz to 506.2 MHz while the sensitivity is increased from 0.72 kHz/kgf to 1.09 kHz/kgf. ©2010 IEEE.en_US
dc.language.isoEnglishen_US
dc.source.titleProceedings of IEEE Sensorsen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/ICSENS.2010.5690582en_US
dc.subjectMetamaterialen_US
dc.subjectNested metamaterialsen_US
dc.subjectRemote sensingen_US
dc.subjectResonance frequencyen_US
dc.subjectRF-MEMSen_US
dc.subjectSensitivityen_US
dc.subjectSplit ring resonatoren_US
dc.subjectStrainen_US
dc.subjectNested metamaterialsen_US
dc.subjectResonance frequencyen_US
dc.subjectRF-MEMSen_US
dc.subjectSensitivityen_US
dc.subjectSplit ring resonatoren_US
dc.subjectArchitectureen_US
dc.subjectComposite micromechanicsen_US
dc.subjectElectric fieldsen_US
dc.subjectFractureen_US
dc.subjectMetamaterialsen_US
dc.subjectMicroelectromechanical devicesen_US
dc.subjectNatural frequenciesen_US
dc.subjectOptical resonatorsen_US
dc.subjectRadiologyen_US
dc.subjectRemote sensingen_US
dc.subjectElectronic equipmenten_US
dc.titleMetamaterial-based wireless RF-MEMS strain sensorsen_US
dc.typeConference Paperen_US
dc.departmentDepartment of Electrical and Electronics Engineering
dc.departmentUNAM - Institute of Materials Science and Nanotechnology
dc.citation.spage2173en_US
dc.citation.epage2176en_US
dc.identifier.doi10.1109/ICSENS.2010.5690582en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record