Amplifying the effect of local magnetic saturation for contactless displacement measurement using copper shielding

Weissinger, Christoph; Lobmeyer, Stefan; Herzog, Hans-Georg

doi:10.1109/i2mtc.2012.6229328

Cited by 1 publication

(1 citation statement)

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“…However, they may also increase the system cost due to their sophisticated structure. Magnetic displacement sensors are known for features such as robustness, low power consumption and simple interfacing circuitries [13][14][15][16], such as magnetoinductive sensors, Hall sensors and magnetoresistance. The magnetoinductive sen sors measure the inductance of coils changed with the perme ability of the core while Hall sensors and magnetoresistance sense the magnetic field, hence the magnetic displacement sensors are sensitive to an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A displacement sensing method based on alternating current magnetic flux measurement

Zhang

Wang

Deng

et al. 2018

Meas. Sci. Technol.

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Displacement sensors play an essential role in many applications. Based on an alternating current magnetic flux measurement, a novel displacement sensing method aimed at developing a practical displacement sensor for ferromagnetic materials is proposed. In this method, the displacement is measured by detecting the magnetic flux in a magnetic circuit, according to a linear relation between the magnetic flux and the reciprocal of displacement. An equivalent magnetic circuit and finite element method are used in analyzing a bridgestructured sensor designed in this paper. Both show that the output of the sensor is linear with the reciprocal of the displacement. A series of experiments have verified the feasibility of the proposed method. The measured results of our prototype sensor show a linear relation with the correlation coefficient R 2 over 0.995 in a measurement range larger than 3 mm. Furthermore, the results significantly indicate that the measured results are not influenced much by the change of ferromagnetic materials with the worstcase error less than 5%.

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Section: Introductionmentioning

confidence: 99%