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1、Developmentofpolymer-basedsensorsforintegrationintoawirelessdataacquisitionsystemsuitableformonitoringenvironmentalandphysiologicalprocessesBiomolecularEngineeringVolume23,Issue5,October2006,Pages253-257AbstractInthiswork,thepressuresensingpropertiesofpolyethylen
2、e(PE)andpolyvinylidenefluoride(PVDF)polymerfilmswereevaluatedbyintegratingthemwithawirelessdataacquisitionsystem.Eachdevicewasconnectedtoanintegratedinterfacecircuit,whichincludesacapacitancetofrequencyconverter(C/F)andaninternalvoltageregulatortosuppresssupplyvo
3、ltagefluctuationsonthetransponderside.Thesystemwastestedunderhydrostaticpressuresrangingfrom0to17 kPa.ResultsshowPEtobethemoresensitivetopressurechanges,indicatingthatitisusefulfortheaccuratemeasurementofpressureoverasmallrange.OntheotherhandPVDFdevicescouldbeuse
4、dformeasurementoverawiderrangeandshouldbeconsideredduetothelowhysteresisandgoodrepeatabilitydisplayedduringtesting.Itisthoughtthatthisarrangementcouldformthebasisofacost-effectivewirelessmonitoringsystemfortheevaluationofenvironmentalorphysiologicalprocesses.Keyw
5、ords:Pressure;Thickfilm;Polymers;Sensor;Wireless1.IntroductionInmanyprofessionsandindustries,theabilitytomakemeasurementsindifficulttoreachordangerousenvironmentswithoutriskingthehealthofanindividualisnowanecessity.Awayofwirelesslytransmittingdatafromthesensor,wh
6、ichisatthepointofinterest,toaremotereceiverisrequired.Usingthisapproach,sensorscanbeimplantedinadifficulttoreachorharshenvironmentandleftthereforaperiodoftime.Sensorsdesignedtomeasureanynumberofparametersincludingpressure,conductivityandpHcouldbeused(Barrie,1992,
7、Astaras,2002andFlickandOrglmeister,2000).Datatransferistypicallyachievedusingradiofrequenciestosendinformationtoareceiver,whichisremotefromtheareaofinterest.Apartfromindustrialandenvironmentalapplications,theseacquisitionsystemscouldrevolutionisethehealthcaresyst
8、eminanumberofareas.Theycouldfindapplicationsinthetreatmentofpatientswhichhaveexperiencedextremetraumasbymonitoringcriticalparameterssuchasintra-cranialpressure
