Data processing method for reducing non-linear error and zero deviation of flexible magnetic sensitive coil
By constructing in-frequency, out-of-phase, and quadrature reference square wave sequences and multiplying them with the output voltage sequence of the flexible magnetic sensitive coil, and combining low-pass filtering and the symmetry of DC estimation to cancel drift, the nonlinear error and zero-point deviation problems of the flexible magnetic sensitive coil under non-same-source conditions are solved, and stable magnetic field measurement is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CENT SOUTH UNIV
- Filing Date
- 2026-03-12
- Publication Date
- 2026-07-17
AI Technical Summary
The effective value of the output voltage of the flexible magnetic sensitive coil increases with the magnetic induction intensity under alternating magnetic field. It has high impedance and is easily affected by environmental electromagnetic interference and temperature drift. Furthermore, under non-same-source reference and analog front-end drift conditions, it is difficult to obtain a stable amplitude estimate for demodulation, resulting in nonlinear error and zero-point deviation.
A reference square wave sequence with the same frequency as the alternating magnetic field to be measured, as well as its anti-phase and orthogonal reference square wave sequences, are constructed. These are multiplied point by point with the output voltage sequence of the flexible magnetic sensitive coil. The DC estimate is extracted by low-pass filtering. The symmetry between the in-phase and anti-phase DC estimates is used to cancel the drift, and the phase deviation is compensated by the orthogonal DC estimate to achieve amplitude synthesis and obtain the magnetic induction intensity.
It effectively reduces the nonlinear error and zero-point deviation of flexible magnetic coil measurements, and is suitable for magnetic field sensing of narrow curved interlayer structures and artificial electronic skin, thus improving the stability and accuracy of measurements.
Smart Images
Figure BSA0000303566680000011 
Figure BSA0000303566680000012 
Figure BSA0000303566680000021