HIGH-SENSITIVITY METAL DETECTOR ROBUST AGAINST DISTURBANCE

摘要

The present invention relates to a high-sensitivity metal detector robust against disturbance, which can detect metal alien substances entailed in food with improved sensitivity and can remove a disturbance signal, the metal detector comprising: a transfer portion for transferring a to-be-detected object; a magnetization portion arranged on the path of transfer of the to-be-detected object so as to magnetize metal alien substances entailed in the to-be-detected object; a magnetic detection portion comprising multiple magnetic sensors arranged at the rear end of the magnetization portion on the path of transfer so as to detect the magnetic field of the to-be-detected object that has passed through the magnetization portion; and a control portion configured to remove a disturbance signal from magnetic field signals received from the magnetic detection portion and to identify signals from the magnetic sensors that have detected the magnetic field of the metal alien substances.