unit-ii bio signal characteristics and electrode
Post on 20-Dec-2021
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Unit-II Bio Signal Characteristics and Electrode configurations
Prepared By
Dr.K.HelenPrabha, HOD/ECE
Mr.P.Arul, Assistant Professor
ECG Electro-Cardiogram- Heart activity
EEG Electro-Encephalogram- Brain Signals
EMG Electro-Myogram - Muscle movement
EOG Electro-Oculogram - Eye movement
GSR Galvanic Skin Response
● Measured with electrodes:skin-electrode interface: Ions <--> Electrodes
Breathing, temperature, movement etc.
● Measured with other sensors / transducers:
Types of Bio electric signals
Primary Characteristics of Bio electric signals
Parameter Frequency range Amplitude Type of
Electrode
Electrocardiogrpahy
(ECG)
0.05 to 120 Hz 0.1 to 5µV
1µV
Surface
Electroencephalography
(EEG)
0.1 to 100 Hz 2 to 200µV
50µV
Scalp
Electromyography
(EMG)
5 to 2000 Hz 0.1 to 5µV Needle
Electroretinography
(ERG)
Dc to 20Hz 0.5 to 1µV Contact
Electro-oculography
(EOG)
Dc to 100 Hz 10 to
3500µV
Contact
ECG – Electrocardiogram
Standardised electrode positions
1. Bipolar limb leads(or) standard leads
2. Augmented unipolar limb leads
3. Chest leads(or) precordial leads
4. Frank lead system(or) corrected
orthogonal leads
ECG - applications
● Diagnostics
● Functional analysis
● Implants (pace maker)
● Biofeedback (Heartrate variability, HRV)
● Peak Performacne Training, Monitoring
EMG - applications
● Rehabilitation
● Functional analysis
● active Prothetics, Orthesis
● Biomechanics, Sports medicine
EEG - applications
● Diagnostics (Epilepsy, Oncology, ..)
● Cognitive Sciences
● Sleep Analysis
● Human Computer Interfaces (BCIs)
● Pharmacology
● Intensive Care, Monitoring
Summary bioelectric signals
Frequency Amplitude (mV)
ECG 0,2 – 300 0,1 - 3
EEG DC – 100 0,005 - 0,2
EEG (cortical) 10 – 100 0,015 - 0,3
EMG 10 – 1000 0,1 - 5
EMG (needle) 10 – 10000 0,05 - 5
EOG 0 – 30 0,1 - 2
Intracell. 0 – 10000 50 .. 130
Video Links:
EEG 10-20 Electrode System:
https://www.youtube.com/watch?v=YfjRhoC2V0E
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