348 KB12 KB198520252003Bunc, MatjažRozman, Janezštevilka:1letnik:33str. 38-40ISSN:0352-9045COBISSID:16680665URN:URN:NBN:SI:doc-84TW4TPZenStrokovno društvo za mikroelektroniko, elektronske sestavne dele in materialeInformacije MIDEMElectromyographyElektromiografijakontrakcijamerjenjemišiceMišična kontrakcijaMuscle ContractionsenzorjisilaSpreminljevalciTransducersSensor of forces in small volume contracting tissues| Senzor sile za meritve krčenja drobnih mišic|A single-channel sensor intended for measurement of forces in small volume contracting tissues within the range of mN was designed, developed and experimentally tested. The force sensor was made up of a Wheatstone bridge composed of four semi-conductor strain gauges bonded on a specially designed cantilever with a handle and metallic cover to protect them. The natural frequency of the sensor is 350Hz while the compliance is 5.7X10-6m/mN. The sensor represents a very linear dependence of the output voftage upon the load. The sensibility of the sensor, at a bridge excitation voltage of 5V, is 0.5mV/mN and the nominal range of the sensor is 0-70mN. Results show that the sensor enables almost isometric measurements of forces in contracting tissues.The results also show that the sensor measures forces with a frequencyof up to 300Hz with appropriate accuracy. Finally, the sensor is suitable for isometric measurements of forces in all types of contracting tissuesIzdelali in testirali smo enokanalni mehansko-elekrični pretvomik za meriive moči krčenja drobnih mišic. Senzor sile je izdelan iz štirih polprevodniških strain-gaugov povezanih v Wheatstonov mostiček, pritrjenih na rigidno merilno ročico ter zaščitenih s kovinskim oklepom. Naravna frekvenca senzorja je 350 Hz in podajnost 5.7 x 10-6 m/mN popolnoma ustreza za meritve skoraj izometričnega krčenja drobnih mišičnih tkiv (<5 N, <50 Hz). Občutljivost senzorja z napajanjem 5 V je v razponu 0-70 mN lineama, 0.5 mV/mN. Testiranja so pokazala, da je mogoče s senzorjem zadovoljivo meriti tudi krčenja s frekvenco blizu 300 Hz. Merilec je primeren za meritve sile izometričnega krčenja različnih krčljivih tkivTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaStrokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale