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A Flexible Wearable Electrooculogram System With Motion Artifacts Sensing and Reduction.

Shibam Debbarma, Sharmistha Bhadra

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    |April 19, 2022
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    Summary

    A new wearable flexible Electrooculogram (EOG) system effectively reduces motion artifacts using non-contact electrodes. This lightweight, wireless device offers high sensitivity and comfort for smart applications.

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    Area of Science:

    • Biomedical Engineering
    • Wearable Technology
    • Physiological Monitoring

    Background:

    • Electrooculogram (EOG) measures eye movements but is highly sensitive to motion artifacts.
    • Existing EOG systems can be cumbersome and require skin preparation.

    Purpose of the Study:

    • To develop a single-channel, wireless, wearable flexible EOG monitoring system.
    • To incorporate motion artifact sensing and reduction capabilities.
    • To enhance user comfort and applicability in smart devices.

    Main Methods:

    • Implementation on a four-layer flexible polyimide substrate.
    • Utilizing two non-contact electrode pairs for EOG and motion artifact detection/reduction.
    • Employing a microcontroller and BLE 5.0 for wireless data transmission with low power consumption (56 mW).

    Main Results:

    • Achieved a gain of ~37 dB and a bandwidth of 1 Hz to 40 Hz.
    • Demonstrated effective motion artifact reduction with horizontally parallel electrode pairs, preserving EOG features like eye-blinking.
    • Non-contact electrodes showed >50x sensitivity compared to commercial gold electrodes, with a ~380 mS response time.

    Conclusions:

    • The developed flexible EOG system is lightweight, comfortable, and eliminates the need for skin preparation.
    • Its non-contact nature and effective artifact reduction make it suitable for integration into eye-masks and headbands.
    • Presents a promising prototype for advanced smart applications requiring reliable eye-movement monitoring.