Patent ID: 11867864
Assignee: nan
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A method for detecting metallic objects comprising the following steps:
S1: emitting a magnetic field at a transmitter coil from a transmitter assembly from a corresponding electrical signal having a frequency which is a function of a first frequency of a first clock from the transmitter assembly;
S2: producing a receiver coil from a receiver assembly an electrical signal as a function of the magnetic field emitted in step S1;
S3: determining an electrical signal having a frequency which is a function of a second frequency of a second clock of the receiver assembly;
S4: comparing the electrical signal produced in step S2 and the electrical signal determined in step S3;
S5: detecting an instant of zero crossing of the electrical signals whose frequency is a function of the first frequency or of the electrical signals whose frequency is a function of the second frequency;
S6: generating a phase realignment signal synchronized to the instant of zero crossing detected in step S5; and
S7: wirelessly transmitting the phase realignment signal of the first clock and of the second clock to the transmitter assembly or to the receiver assembly;
wherein the method for detecting metallic objects further comprises determining if the magnetic field emitted in step S1 has been disturbed by metallic objects.