Displacement Measurement Method Based on Doppler-like Effect in Time-varying Magnetic Field

doi:10.3901/JME.2017.18.018

Abstract

Abstract: A displacement measurement method based on Doppler-like effect in time-varying magnetic field is proposed. It builds a sine-distributed time-varying magnetic field which moves in a particular direction. A Doppler-like frequency shift occurs in the output of induction coils when it is moving in the special magnetic field. The difference in frequency can be measured and then the displacement of the moving object can be calculated. Finite element models are built according to the measuring principle to simulate the distribution of the time-varying magnetic field and the Doppler-like frequency shift. Simulation shows that the sine shape distribution of time-varying magnetic field was moving at a constant velocity, and the sum of the difference in time caused by Doppler-like frequency shift has a linear relationship with the displacement of the moving coils. Nonlinear Error is less than 0.2% in one pitch in this simulation. Multi-layer printed circuit board technology has been employed to design and manufacture the displacement sensor prototype based on the simulation model. And then experiments of Doppler-like effect and displacement measurement accuracy have been taken. Accuracy of the displacement sensor based on Doppler-like effect reached 1µm in a 200 mm range, after a calibration taken to correct the deviation caused by manufacture and installation of sensor and the electrical bias caused by excitation source and measurement circuit. A low cost solution and related theory are provided to realize precise displacement measurement.

Key words: displacement measurement, Doppler-like effect, sensor, time-varying magnetic field

CLC Number:

LU Jin, CHEN Xihou, TANG Qifu, WU Liang. Displacement Measurement Method Based on Doppler-like Effect in Time-varying Magnetic Field[J]. Journal of Mechanical Engineering, 2017, 53(18): 18-25.

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