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The Study of Measurement System for Visual Evoked Potentials

Author: LiuQingFeng
Tutor: ZhangLiuQiang
School: Chongqing University
Course: Optical Engineering
Keywords: Visual evoked potentials Enlarge Measuring ORCAD / PSpice
CLC: R318.0
Type: Master's thesis
Year: 2009
Downloads: 68
Quote: 3
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Abstract


Visual evoked potential bio - electrical activity in the brain, the visual cortex in the retina is stimulated , it can detect the visual pathway from the retina to the visual cortex functional damage . Visual evoked potential technology with non - invasive , objectivity , qualitative , quantitative , and repeatability characteristics , eye disease diagnosis and differential plays an important role . Due to the need to study the visual evoked potential is of great significance for the research and development of the visual evoked potential measurement system . Visual evoked potential is a low frequency , weak signal , the measurement process is vulnerable to the impact of the strong background noise and interference signal amplification has become the most critical aspects of visual evoked potential measurement and analysis . Introduce visual evoked potential characteristics and analysis of the the biological electrode extraction visual evoked potential equivalent circuit model to study the impact of the visual evoked potential measurements from the system of internal noise and external interference explore high source impedance weak signal measurement impact factors , analysis of the dispersion of the components on the circuit performance , utilization and protection , the right leg drive , isolation , and other technical design low noise , high common mode rejection ratio visual evoked potential amplifier circuit system with ORCAD / PSpice software circuit design simulation as a control unit , a microcontroller LPC2148 data acquisition and control system design , printed circuit board design of the the VEP measurement circuit system , circuitry designed to the image flip stimulate way expand experiments , recording a body image reversal visual evoked potentials . Experimental results show that the the VEP measurement system gain range : 10,000 to 200,000 , Bandwidth : 300Hz, short-circuit equivalent input noise peak-to-peak range : 2 to 4μV common-mode rejection ratio : 106.7dB, superimposed on average after 64 times , successfully tested the human visual evoked potentials .

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