Desenvolvimento de um sistema de aquisição de biopotenciais da face e análise delinearidade dos sinais de eletro-oculografia

Abstract

Biopotential applications have been broadly used for the development of new technolo- gies, especially those that seek integration of the human body with electronic devices. Based on this context, the use of facial biopotentials like Electrooculogram (EOG) and Electromyogram (EMG), become important for the advancement of tools to assist people with motor disabilities or speech disorders. Therefore, the present research demon- strates the development of an acquisition system for these biopotentials and discuss ways of using it. The system consists of a glass-like device with electrodes allocated in such ways that it can acquire EOG and facial EMG signals. Moreover, it has circuit capable of amplify and filter the signals, with an adequate frequency band for the studied biopotentials. The linear relationship between the EOG signals and gaze angles stand out among various characteristics of these signals. For this reason, a methodology was developed to acknowledge the behavior of this characteristic. The method evaluates maximum and minimum values of EOG signals for angles between 5 and 50 degrees in vertical and horizontal movements. In addition, a computational program was developed to identify when a EOG signal is realized to the left or right, and when an EMG signal is being made by biting. Therefore, at the end of this research is discussed how this system can be employed to assist people with motor disabilities or speech disorders.