Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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A Novel Method for Improving the Positioning Accuracy of a Magnetostrictive Position Sensor Using Temperature Compensation

온도 보상을 이용한 자기변형 위치 센서의 정확도 향상 방법

  • Yoo, E.J. (Advanced Transportation Vehicle Institute, Chungnam National Unversity) ;
  • Park, Y.W. (Mechatronics Engineering, Chungnam National Unversity) ;
  • Noh, M.D. (Mechatronics Engineering, Chungnam National Unversity)
  • 유은주 (충남대학교 첨단수송체연구소) ;
  • 박영우 (충남대학교메카트로닉스공학과) ;
  • 노명규 (충남대학교메카트로닉스공학과)
  • Received : 2019.11.19
  • Accepted : 2019.11.29
  • Published : 2019.11.30
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Abstract

An ultrasonic based magnetostrictive position sensor (MPS) provides an indication of real target position. It determines the real target position by multiplying the propagation speed of ultrasonic wave and the time-of-flight between the receiving signals; one is the initial signal by an excitation current and the other is the reflection signal by the ultrasonic wave. The propagation speed of the ultrasonic wave depends on the temperature of the waveguide. Hence, the change of the propagation speed in various environments is a critical factor in terms of the positioning accuracy in the MPS. This means that the influence of the changes in the waveguide temperature needs to be compensated. In this paper, we presents a novel way to improve the positioning accuracy of MPSs using temperature compensation for waveguide. The proposed method used the inherent measurement blind area for the structure of the MPS, which can simultaneously measure the position of the moving target and the temperature of the waveguide without any additional devices. The average positional error was approximately -23.9 mm and -1.9 mm before and after compensation, respectively. It was confirmed that the positioning accuracy was improved by approximately 93%.

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References

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