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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Volume 26, No. 02, Month AUGUST, Year 2019, Pages 203 - 215


Development of automatic electrode position selection and electrode integrity determination system for electromyography signal measurement

Withit Sae-lim, Pornchai Phukpattaranont and Kittikhun Thongpull


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This study presents a development of automatic electrode position selection and electrode integrity determination system for electromyography (EMG) signal measurement. The quality of electrode for EMG measurement was determined using an electrode-skin impedance. The impedance measurement system was developed based on AD5933 with frequency range of 5 kHz to 100 kHz and the impedance range of 1 k to 10 M. This work proposes an “Auto calibration” system which is designed for increasing the accuracy of impedance measurement system. AD5933 was controlled by an Arduino Mega 2560 and measurement results were displayed and recorded by a computer. The experimental results show that the accuracy of impedance from the proposed system is lower than 2% on the impedance range of 1 k to 1 M at the operation frequency 5 kHz while the range of 1 M to 10 M results in higher measurement error. Then, the electrode-skin impedance measured from the proposed system was used to compare with the quality of EMG signals. Results show that signal to noise ratio (SNR) of the EMG signals from the low electrode-skin impedance is better than that from the high electrode-skin impedance. The proposed system was applied for electrode position selection and electrode integrity determination based on a dry 3  3 electrode grid.


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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Published by : Faculty of Engineering Chiang Mai University
Contributions welcome at : http://researchs.eng.cmu.ac.th/?name=journal