Electrode contact noise in surface biopotential measurements

Fernández, María Belén; Pallás-Areny, R.

doi:10.1109/iembs.1992.5760887

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…By placing a surface electrode in contact with the skin through an electrolyte, a distribution of charges occurs at the electrode-electrolyte interface, which results in the appearance of a potential called half-cell potential. If the electrode moves with respect to the electrolyte, there will be an alteration in the distribution of the charge, which will cause a transient variation in the half-cell potential [25,26]. In the same way, at the electrolyte-skin interface, there will also be a distribution of charges and, therefore, an equilibrium potential that will vary if there is movement between the skin and the electrolyte.…”

Section: Electrode Contact Noisementioning

confidence: 99%

“…Disturbances caused by muscular actions, such as chewing, the opening or closing of the eyes, frowning, etc., considerably affectthe EOG signal recording [24][25][26][27][28]. The most important muscular action is blinking since it is involuntary, and although it does not modify the electrostatic potential of the eye, it can move the electrodes, creating electrode-skin interference.…”

Section: Noise From Other Biopotentialsmentioning

confidence: 99%

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High-Performance Analog Front-End (AFE) for EOG Systems

et al. 2020

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Electrooculography is a technique for measuring the corneo-retinal standing potential of the human eye. The resulting signal is called the electrooculogram (EOG). The primary applications are in ophthalmological diagnosis and in recording eye movements to develop simple human–machine interfaces (HCI). The electronic circuits for EOG signal conditioning are well known in the field of electronic instrumentation; however, the specific characteristics of the EOG signal make a careful electronic design necessary. This work is devoted to presenting the most important issues related to the design of an EOG analog front-end (AFE). In this respect, it is essential to analyze the possible sources of noise, interference, and motion artifacts and how to minimize their effects. Considering these issues, the complete design of an AFE for EOG systems is reported in this work.

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Section: Electrode Contact Noisementioning

confidence: 99%

Section: Noise From Other Biopotentialsmentioning

confidence: 99%

High-Performance Analog Front-End (AFE) for EOG Systems

et al. 2020

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“…Fewer works are available on EGS noise and its power spectrum. Although EGS noise has been experimentally observed since the 1950s [1][2][3][4], as well as measured and occasionally modelled in the biosignal frequency range from about 0.1 Hz to 500-1000 Hz [5][6][7], a description of its generation mechanism is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Half-cell and noise voltages at a metal-electrode and dilute solution interface

Barbero¹,

Evangelista²,

Merletti³

2022

J. Stat. Mech.

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The detection of bioelectric signals is usually based on an electrode-skin contact that is often mediated by a layer of conductive gel. This interface produces a DC voltage (half-cell potential) and a random noise voltage whose relationship is not well known. The first may cause amplifier saturation and the second posits a limit to the detection of small signals. This work investigates the mechanisms of generation of these two voltages in the simpler case of a metal-electrolyte junction and finds a theoretical expression for both, under a few simplifying hypotheses. An expression is found that relates the two voltages to the ionic concentration and to the parameters defining the dynamics of the adsorption–desorption phenomena taking place at the interface. A relationship is found between the two voltages that is in qualitative agreement with experimental findings reported in the literature. This theoretical background provides a basis for further investigation of the metal-gel and of the gel-skin interfaces not addressed in this work.

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“…The skin-electrode interface noise performance is a crucial factor in high-resolution surface bio-potential measurements. Recorded electrocardiogram (ECG) signals have very low amplitudes of 50 μV-10 mV in the bandwidth of 0.5-250 Hz and are highly susceptible to contamination from unwanted interference and noise [1][2][3]. The use of un-gelled or dry electrodes in the ambulatory recording of heart rate and ECG has emerged in recent years and continues to gain popularity [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…This claim is not always supported with experimental evidence. The origin of the noise in surface electrodes has been investigated in the past by several researchers [1,[15][16][17][18][19]. However, there is little or no information available on the noise performance of un-gelled, fabric-based electrodes.…”

Section: Introductionmentioning

confidence: 99%

Noise performance of textile‐based dry ECG recording electrodes

Maji

Burke

2020

Electronics Letters

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This study reports attempts to characterise the noise properties of ungelled, textile-based electrodes intended for use in ECG recording in wearable garments. Measurements were made using very low noise operational amplifiers and with mains power supply interference eliminated from the recorded signals so that they reflected only genuine noise. Measurements were carried out on four conductive fabric electrodes, one conductive rubber electrode and a standard self-adhesive, gelled electrode on three male and three female subjects. Curves of the form y = K/f + C were fitted to the recorded noise spectral density functions. Coefficients obtained for the white noise spectral density ranged from 1.1 to 5.6 nV/ÝHz and for the flicker (1/f) noise spectral density ranged from 8 to 80 nVÝHz.

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Electrode contact noise in surface biopotential measurements

Cited by 7 publications

References 2 publications

High-Performance Analog Front-End (AFE) for EOG Systems

High-Performance Analog Front-End (AFE) for EOG Systems

Half-cell and noise voltages at a metal-electrode and dilute solution interface

Noise performance of textile‐based dry ECG recording electrodes

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