Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Wheatstone Bridge-type High Sensitivity and Flexible Implementation of Pressure Sensors and Evaluation of Sensor Performance

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

  • Chun, Sehwan (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kim, Sangun (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Moon, Taein (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Choi, Taeyang (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kim, Jooyong (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 전세환 (숭실대학교 유기신소재파이버공학과) ;
  • 김상운 (숭실대학교 유기신소재파이버공학과) ;
  • 문태인 (숭실대학교 유기신소재파이버공학과) ;
  • 최태양 (숭실대학교 유기신소재파이버공학과) ;
  • 김주용 (숭실대학교 유기신소재파이버공학과)
  • Received : 2022.08.01
  • Accepted : 2022.08.16
  • Published : 2022.08.31
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Abstract

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 a conventional pressure sensor manufacturing method, by implementing a Wheatstone bridge-type pressure sensor. To fabricate a Wheatstone bridge-type pressure sensor, a circuit was fabricated with conductive thread, and silver paste was printed with a strain gauge. The analysis was performed according to the number of strain gauges, and the gauge factor (GF), which is a measure of sensitivity, and the coefficient of determination were analyzed to evaluate the linearity of the pressure sensor. In terms of linearity, four strain gauges showed 55 times higher value than that of the SWCNT dip-coated pressure sensor, 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, but when 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 linearly stretched by pressure. This is expected to be used in fields requiring high sensitivity, such as pulse measurement, heart rate measurement, and precision scale.

Keywords

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