휘트스톤 브리지 방식의 고 민감성 플렉시블 압력 센서 구현 및 센서 성능 평가

초록

The purpose of this study is to implement a high-sensitivity pressure sensor,which is different from the SWCNT dip-coated pressure sensor that was fabricated using aconventional pressure sensor manufacturing method, by implementing a Wheatstonebridge-type pressure sensor. To fabricate a Wheatstone bridge-type pressure sensor, a circuitwas fabricated with conductive thread, and silver paste was printed with a straingauge. The analysis was performed according to the number of strain gauges, and thegauge factor (GF), which is a measure of sensitivity, and the coefficient of determinationwere analyzed to evaluate the linearity of the pressure sensor. In terms of linearity, fourstrain gauges showed 55 times higher value than that of the SWCNT dip-coated pressuresensor, but the value was slightly lower than that of the SWCNT-impregnated pressure sensor. The Wheatstone bridge follows the equation R1×R3=R2×R4 in the equilibrium state, butwhen four strain gauges are used, the initial voltage is low and the GF value is high. However,the linearity was analyzed to be insufficient because the strain gauge was not linearlystretched by pressure. This is expected to be used in fields requiring high sensitivity, suchas pulse measurement, heart rate measurement, and precision scale.

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