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The principle of sensor system is eddy current effect.When the sensor system is powered on, a high-frequency current signal will be generated in the preheater, which will be sent to the head of the probe through the cable and generate an alternating magnetic field H1 around the head. If no metal conductor material approaches within the range of the magnetic field H1, all the energy emitted to this range will be released.Conversely, if
If there is a metal conductor material close to the head of the probe, the alternating magnetic field H 1 will generate an eddy current field on the surface of the conductor, and the eddy current field will also generate an alternating magnetic field H 2 in the opposite direction to H 1.Due to the reaction of H 2, the amplitude and phase of the high frequency current of the coil at the head of the probe will be changed, that is, the effective impedance of the coil will be changed.This change is related to both eddy current effect and magnetostatic effect, that is, the conductance, permeability, geometry, coil geometry parameters, excitation current frequency and the distance from the coil to the metal conductor.Assume that the metal conductor is homogeneous and its properties are linear and isotropic, then the coil
The physical properties of a metal conductor system are usually determined by the metal conductor's permeability muon, sigma, size factor r, coil and
The distance of the metal conductor delta, coil excitation current intensity I and frequency are described in equal parameters.The impedance of the coil is thus expressed as a function Z=F.If you control mu, sigma, r, delta I, omega, constant, then impedance Z will be one value function of distance delta, a nonlinear function with an S curve and a linear function within a certain range.
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