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Open AccessArticle

Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements

1
School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
2
LG CNS AI&BigData Research Center, Seoul 07795, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(20), 4572; https://doi.org/10.3390/s19204572
Received: 4 October 2019 / Revised: 14 October 2019 / Accepted: 17 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Sensors for Affective Computing and Sentiment Analysis)
Dry contact electrode-based EEG acquisition is one of the easiest ways to obtain neural information from the human brain, providing many advantages such as rapid installation, and enhanced wearability. However, high contact impedance due to insufficient electrical coupling at the electrode-scalp interface still remains a critical issue. In this paper, a two-wired active dry electrode system is proposed by combining finger-shaped spring-loaded probes and active buffer circuits. The shrinkable probes and bootstrap topology-based buffer circuitry provide reliable electrical coupling with an uneven and hairy scalp and effective input impedance conversion along with low input capacitance. Through analysis of the equivalent circuit model, the proposed electrode was carefully designed by employing off-the-shelf discrete components and a low-noise zero-drift amplifier. Several electrical evaluations such as noise spectral density measurements and input capacitance estimation were performed together with simple experiments for alpha rhythm detection. The experimental results showed that the proposed electrode is capable of clear detection for the alpha rhythm activation, with excellent electrical characteristics such as low-noise of 1.131 μVRMS and 32.3% reduction of input capacitance. View Full-Text
Keywords: EEG measurements; active electrodes; spring-loaded dry electrodes; two-wired electrodes; bootstrapping topology EEG measurements; active electrodes; spring-loaded dry electrodes; two-wired electrodes; bootstrapping topology
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MDPI and ACS Style

Lee, S.; Shin, Y.; Kumar, A.; Kim, K.; Lee, H.-N. Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements. Sensors 2019, 19, 4572. https://doi.org/10.3390/s19204572

AMA Style

Lee S, Shin Y, Kumar A, Kim K, Lee H-N. Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements. Sensors. 2019; 19(20):4572. https://doi.org/10.3390/s19204572

Chicago/Turabian Style

Lee, Seungchan; Shin, Younghak; Kumar, Anil; Kim, Kiseon; Lee, Heung-No. 2019. "Two-Wired Active Spring-Loaded Dry Electrodes for EEG Measurements" Sensors 19, no. 20: 4572. https://doi.org/10.3390/s19204572

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