Ring-Shaped Inductive Sensor Design and Application to Pressure Sensing

환형 인덕티브 센서의 설계 및 압력센서로의 적용

  • 노명규 (충남대학교 메카트로닉스공학과) ;
  • 김선영 (삼성전기 기판사업부) ;
  • 백성기 (충남대학교 메카트로닉스공학과) ;
  • 박영우 (충남대학교 메카트로닉스공학과)
  • Received : 2015.05.02
  • Accepted : 2015.08.10
  • Published : 2015.10.01


Inductive sensors are versatile and economical devices that are widely used to measure a wide variety of physical variables, such as displacement, force, and pressure. In this paper, we propose a simple inductive sensor consisting of a thin partial ring and a coil set. The self-inductance of the sensor was estimated using magnetic circuit analysis and validated through finite element analysis (FEA). The natural frequency of the ring was estimated using Castigliano's theorem and the method of equivalent mass. The estimation was validated through experiments and FEA. A prototype sensor with a signal processing circuit is built and applied to noninvasively sense the pressure inside a flexible tube. The obtained sensor outputs show quadratic behavior with respect to the pressure. When fitted to a quadratic equation, the least-square measurement error was less than 2%. The results confirm the feasibility of pressure sensing using the proposed inductive sensor.


Inductive Sensing;Non-Invasive Sensing;Pressure Sensing


Supported by : 충남대학교


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