Suppression Efficiency of the Correlated Noise and Drift of Self-oscillating Pseudo-differential Eddy Current Displacement Sensor

V. Chaturvedi, J.G. Vogel, S. Nihtianov

Research output: Contribution to journalConference articleScientificpeer-review

3 Citations (Scopus)
24 Downloads (Pure)

Abstract

The suppression efficiency of the correlated noise and drift of self-oscillating front-end circuit in a pseudo-differential eddy-current displacement sensor (ECDS) is investigated using COMSOL and MATLAB. The transfer characteristic of the sensor coil, excited at 200 MHz, is obtained through a FE model in COMSOL. The characteristic is linearized to a second-order fit around a standoff distance to the target (xso) of 55 μm. The nonlinearity of the interface is modelled in MATLAB. It is found that, in order to tolerate 1% drift in the oscillator amplitude, a maximum 2nd harmonic distortion (HD2) of the interface has to be less than −72 dB when the sensor HD2 is −51.5 dB for 5 μm displacement range around xso = 55 μm.
Original languageEnglish
Pages (from-to)946-949
Number of pages4
JournalProcedia Engineering
Volume168
DOIs
Publication statusPublished - 1 Sep 2016
EventEurosensors 2016: The 30th anniversary Eurosensors Conference - Budapest, Hungary
Duration: 4 Sep 20167 Sep 2016

Keywords

  • displacement
  • sensor
  • eddy-current
  • demodulator
  • oscillator
  • drift
  • nonlinearity
  • finite elelement

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