Avtor/Urednik		Bunc, Matjaž; Rozman, Janez
Naslov		Sensor of forces in small volume contracting tissues
Prevedeni naslov		Senzor sile za meritve krčenja drobnih mišic
Tip		članek
Vir		Inf MIDEM
Vol. in št.		Letnik 33, št. 1
Leto izdaje		2003
Obseg		str. 38-40
Jezik		eng
Abstrakt		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 frequency of up to 300Hz with appropriate accuracy. Finally, the sensor is suitable for isometric measurements of forces in all types of contracting tissues.
Izvleček		Izdelali 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 tkiv.
Deskriptorji		MUSCLE CONTRACTION TRANSDUCERS ELECTROMYOGRAPHY