| Summary: | 碩士 === 國立臺南大學 === 電機工程學系碩博士班 === 104 === The aim of this thesis is to design a bi-potentiostat which can be applied to measure two biosensors at the same time. In the bi-potentiostat, two biosensors share a counter electrode and a reference electrode, and they have two independent working electrodes. In the hardware design, we use a microprocessor as a data accessing and controlling device, by means of cooperating with the circuits of operation amplifiers to accomplish the setting of scanned voltages and the current detection. In the software design, we use “LabVIEW” to design the user operation interface. Users can use the interface to set experimental parameters and observe measured results. The proposed bi-potentiostat integrated with two biosensors can measure different ingredients in a solution at the same time, by performing two operation modes which are commonly used in electrochemical experiments: cyclic voltammetry and potentiostatic i-t. While performing electrochemical experiments, the two working electrodes can be set on different potential to accomplish the function of dual channel detection. In system verification, we use the screen-printed electrodes to simulate biosensors and use them to measure the potassium ferricyanide solution (3K+[Fe(CN)6]3-) to verify the proposed bi-potentiostat’s function. The experimental result shows that the proposed bi-potentiostat has the same trend as the commercial potentiostat. In conclusion, the proposed bi-potentiostat has the merits of small size, low cost, and portability. Moreover, it can measure two kinds of biosensors at the same time.
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