1-2
Metal Detector
METARIDDER
1.1
Detection Principle and Features
1.1.1
Detection Principle
The machine is designed to make a highly accurate metal detection by the adoption of Dielectric
Loss Isolated High Frequency Oscillation method sensor, which was developed by SAIKA.
If a metal piece approaches the magnetic field A generated by the sensor, an eddy current runs on
the metal surface and the magnetic field B will be generated to cancel the magnetic field A. The
machine detects the disturbance caused by the generation of magnetic field B and determines if it
is caused by a metal from the level of response.
Metal piece
Material
Magnetic field A
generated by the sensor
Sensor coil
Magnetic field B generated
by the approaching metal
piece
(opposite to A)
Internal tube of the sensor
(ceramic)
Sensing area
