Abstract
Strain is a crucial assessment parameter in structural health monitoring systems. Microstrip sensors have been one of the new types of sensors used to measure this parameter in recent years. So far, the strain directionality of these sensors and the methods of miniaturization have been studied. This article proposes the use of a single cell metamaterial as a resonator of the microstrip sensor excited through the microstrip line. The proposed solution allowed for significant miniaturization of the microstrip sensor, with just a slight decrease in sensitivity. The proposed sensor can be used to measure local deformation values and in places with a small access area. The presented sensor was validated using numerical and experimental methods. In addition, it was compared with a reference (rectangular geometry) microstrip sensor.
Highlights
The safety and integrity of infrastructure is an important aspect of building and maintaining activities
Mechanical loading of the sample simultaneously deforms the tested microstrip sensor. It causes the change of the current density distribution in the microstrip patch as well as low-cost vector network analyzer (VNA) have been developed, which could be used in the future in practical Structural Health Monitoring (SHM) measurements
Where: f rload is the resonant frequency for the case with external mechanical load, and f rε=0 is the resonant frequency without mechanical deformation
Summary
The safety and integrity of infrastructure is an important aspect of building and maintaining activities. Changing the shape of the patch (i.e., because of external strain) changes the resonant frequency In this type of sensor, the reflection coefficient as a function of frequency is monitored to determine the deformation based on the resonant frequency shifts. An important advantage of microstrip sensors is the ability to measure many resonance frequencies with different current density distributions in the patch. This property allows the direction and stress values to be measured using one sensor. Microstrip strain sensors designed for higher operating frequencies are smaller and have higher sensitivity It seems that the best way is to design sensors for high resonant frequencies. Their ing theugneiqoumeertreysoonfanthcee pstrroupcetrutrieasl cealenmbeenrtesl.atIinvetlhyiseawsiolyrkc,oonntreololfedthbeybaepspt-rkonporiwatnelmy dete-signing amateritahlesgtreuocmtuerterys—ofathvaersitarnutcotufrtahleeslepmlitenritns.gIrnetshoinsawtoorrk(S,RoRne)—ofwthase ubesestd-.kInnowthne mliteetraam- aterial ture, thsistrvuacrtiuarnetsi—s caalvleadriaandtooufbtlheespsplilti-trirninggrerseosonnataotror(d(SSRRRR)).—Inwtahsisuwseodrk. ,Itnhethperolipteorsaetdure, this sensor vwaarsiacnotmispcaarleldedwaitdhoaubrleectsapnlgitu-rlianrgmreicsroonsatrtiopr s(denSsRoRr.).NInumtheisriwcaol rcka,lcthuelaptiroonpsoasned sensor strain mweaassucoremmpeanrtesdwweritehpaerrfeocrtmanegduilnarormdiecrrotostervipalsueantesotrh.eNduesmigenriecdalsecnalscourlsa.tions and strain measurements were performed in order to evaluate the designed sensors
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