Title :
Compensation of Mismatch Electrodes Impedances in Biopotential Measurement
Author :
Silva, Ivan S S ; Naviner, Jean-François ; Freire, Raimundo C S
Author_Institution :
Univ. Fed. do Para, Belem
Abstract :
The electric energy system power (50 or 60Hz) interference is one of the main noise sources in the biopotential measurement processes at the patient body surface. Even considering the use of high input impedance instrumentation amplifiers and high common mode rejection ratio (CMRR) values, the electrodes impedances mismatch implies common mode (noises) signals appearance that are amplified by the differential gain. Band-reject filters can be used for these interference signals attenuation. However, the interference frequency source can vary, becoming necessary the use of auto-tuner filters. Moreover, when the noise frequency is inside the signal frequency band that we are measuring, the use of this filter type can provoke the loss of important data from a clinical patient evaluation
Keywords :
band-stop filters; bioelectric potentials; biomedical electrodes; biomedical electronics; biomedical measurement; impedance matching; medical signal processing; auto-tuner filter; band-reject filters; biopotential measurement; common mode noise signals; common mode rejection ratio; differential gain; electric energy system; electrodes impedance; impedance instrumentation amplifiers; interference frequency source; interference signal attenuation; patient body surface; power interference system; Electric variables measurement; Electrodes; Energy measurement; Filters; Frequency; Impedance measurement; Interference; Noise measurement; Power measurement; Surface impedance;
Conference_Titel :
Medical Measurement and Applications, 2006. MeMea 2006. IEEE International Workshop on
Conference_Location :
Benevento
Print_ISBN :
1-4244-0253-0
DOI :
10.1109/MEMEA.2006.1644454
