Abstract
Excitation systems of known ferro-induction converters (FIC) are considered. A variant of the FIC with a new excitation method based on electromagnetic-acoustic (EMA) and magneto-modulation (MME) effects is proposed. A variant of a constructive solution for a fluxgate sensor that implements the proposed excitation method is described. The physical processes underlying this technical solution are considered in detail. It is shown that in the proposed sensor, five operating modes are simultaneously implemented, accompanied by the corresponding physical effects: 1) the mode of a bridge inductive-capacitive voltage divider; 2) the mode of the EMA transducer, which implements the emergence process of spatially periodic acoustic waves; 3) -transformation mode due to the EMA effect; 4) inductor mode, in which the measuring coils, in addition to their direct purpose, additionally perform the functions of elements for generating an exciting magnetic field; 5) -transformation mode due to MME. The analysis of the emerging physical effects and their analytical description showed that the proposed multifactor excitation mode has the following advantages: 1) significant design simplification due to the fact that the measuring coils combine such functions as alternating magnetic field excitation and information signal recording; 2) increased noise immunity due to making use of measuring coils as upper arms of the inductive-capacitance measuring bridge with the difference signal of its measuring diagonal, which provides in-phase component noise compensation and the temperature drift consequences compensation; 3) hypersensitivity without deterioration in conversion accuracy due to making use of different physical effects during resonance action of corresponding physical fields; 4) lower power consumption.
Keywords
ferro-induction transducer, flux-gate sensor, electromagnetic field, electromagnetic-acoustic effect, acoustic waves, alternating magnetic field strength, eddy currents, magnetic permeability modulation
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