| Summary: | 碩士 === 國立交通大學 === 電控工程研究所 === 102 === This study aims a simpler near-infaraed spectroscopy (NIRS) system with smaller and lower cost than commercial instrument. To detect the hemodynamic response of oxyhemoglobin (HbO2) and deoxyhemoglobin (Hb) in human tissue based on the different absorption of near-infrared light wavelengths, this system used cheap light emitted diodes (LEDs) photodiodes (PDs) as the light source and detector, respectively. For peripheral Interface control, FPGA was utilized to control the pulse width modulation (PWM) for LEDs to generate various density of light source. The light distributor for red and infrared light and the automatic power calibration in this system were implemented by analog signal processing circuits and controlled by the FPGA. This study designed an interactive brain computer interface (BCI) with the arterial occlusion experiments to test the feasibility, and then verified the system and its algorithm with breath-hold experiments. In the experiment results, the proposed system has better hemodynamic response then ETG-4000, an extremely expensive NIRS system designed by Hitachi Medical Corporation. Finally, compared with other related NIRS systems, the light source and light distributor architecture of the proposed system is more easily and simply to implement, and this study has proved the feasibility of series of experiments.
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