G - Physics – 01 – V
Patent
G - Physics
01
V
340/124.3
G01V 3/11 (2006.01) G01V 3/10 (2006.01)
Patent
CA 1224257
ABSTRACT OF THE DISCLOSURE A device for detecting metallic objects in a material flow, comprising as sensing member a scanning coil consist- ing of a primary coil and, for example, two oppositely connected secondary windings arranged symmetrically around the primary winding so that the voltage induced in the secondary winding becomes zero as long as no conducting objects appear in the scanning area. To elimiate irrele- vant signals from conducting objects in the vicinity of the scanning coil but not in the material flow or Prom weakly conducting objects in the material flow, the primary winding is fed with at least two alternating currents having different frequencies. The corresponding secondary voltages are rectified in phase-controlled rectifiers, and in a calculating circuit the difference is derived between the output of one rectifier voltage and the output of another rectifier multiplied by a constant factor which includes the relation between the frequencies of the corresponding alternating voltages.
424952
Lenander Bo
Thegel Lennart
Asea Aktiebolag
Robic Robic & Associes/associates
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