METAL DETECTOR AND THE METAL OBJECTS DETECTION METHOD Russian patent published in 2018 - IPC G01V3/11 

FIELD: instrument engineering.

SUBSTANCE: invention relates to the located in various enclosing environments metal objects detection. Metal detector contains generator, the metal detector sensor, high frequency quadrature components isolating unit (QCIU), low frequency QCIU, microcontroller and indicating unit. Metal detector sensor contains excitation inductance coil L1, signal inductance coil L2, in-series connected to the inductance coil L1 capacitor C1, in-parallel connected to the inductance coil L2 capacitor C2, in-series connected inductance coil L3 and capacitor C3, in-series connected inductance coil L4 and capacitor C4. Capacitor C1 free contact is connected to the generator excitation current high-frequency output. Inductance coil L1 free contact is connected to the said generator excitation current first low-frequency output. Inductance coil L2 and capacitor C2 parallel connection first contact is the metal detector sensor high-frequency output. Inductance coil L4 and capacitor C4 serial connection mid-point is the metal detector sensor low-frequency output. Generator comprises the excitation current second low-frequency output, which signal is opposite in phase relative to the generator excitation current signal first low-frequency output. Excitation current second low-frequency output is connected to the inductance coil L3 free contact, which is the metal detector sensor excitation current second low-frequency input. Introduced vector signals by the sensor high-frequency and low-frequency outputs are used to calculate the vector in accordance with expression . Determined during the metal detector setup constant coefficient k is chosen to fulfill the condition , where , – received by the metal detector sensor vector signals arising due to the sensor interaction with the weak magnetic enclosing environment in the metal object absence therein, provided that vectors , are oriented along the X axis in the orthogonal coordinate system. Vector quadrature components are used to detect and identify metal objects in the weak magnetic enclosing environment.

EFFECT: increase in the metal detector noise immunity, sensitivity and identification ability.

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