Metal, especially iron parts entering the aperture disturb the uniform electric field, a voltage is caused in the pick-up coils and amplified in order to give signals, ... The schematic circuit diagram of a stationary metal detector is shown in Fig.
|Title||:||Principles of Wood Science and Technology|
|Author||:||Franz F.P. Kollmann, E.W. Kuenzi, A.J. Stamm|
|Publisher||:||Springer Science & Business Media - 2012-12-06|