Exploration on low cost and effective EOG bio-potential amplifier design and development
Khomdram Jolson Singh, Dhanu Chettri, Rudi Okram, Lydia Yuhlung · 2016
The Cornea-Retinal Potential (CRP) is the main source of the Electrooculogram (EOG) signals. These potential are in small microvolt and required to be amplified upto the applicable and usable level. The place of electrode attachment, the eyeball rotation, the motion of head, the ambient light as well as the conductivity of skin can also vary this signal. These numerous artifacts with power-line interference and other unwanted noise had made the EOG signal quite unattractive for any real biomedical applications. This work thus mainly focuses on the elimination of the above major artifacts while striving to maintain signal linearity. The hardware design part also considers the cost effectiveness without negotiating accuracy. The circuit is then rigorously tested and checked over the varied sample of people. It is found to give an efficient and significantly consistent result with minimum noise level. The development and design of a low cost EOG signal amplifier and acquisition system that counters all the major problems is investigated and achieved making it suitable for both theoretical research analysis as well as for real practical applications.