Instrument for measuring coin conductivity
A technology of conductivity and measuring instruments, which is applied in the field of conductivity measuring instruments and conductivity measuring instruments, can solve the problems of lossy measurement and slow test speed, and achieve the effect of reducing the influence of external factors
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[0023] Generally, the principle of eddy current testing can be used figure 1 and figure 2 Indicates that the coin is always placed in or close to the detection coil. The coil generates an alternating magnetic field Hp, under the action of Hp, an eddy current is induced in the coin, and the eddy current generates a secondary magnetic field HS, which interacts with the magnetic field Hp, causing the original magnetic field to change, making the coil inside The magnetic flux changes, which changes the impedance of the coil. The geometric size, electrical conductivity, magnetic permeability, pattern structure, etc. of the coin will change the density and distribution of the eddy current, thereby changing the impedance of the coil. The impedance of the detection coil can be expressed by complex impedance, namely: Z=R+jX
[0024] When a coin approaches the coil, the complex impedance of the coil changes due to the eddy currents in the coin. Wherein, the change of the real part ...
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