G - Physics – 01 – N
Patent
G - Physics
01
N
324/48
G01N 27/72 (2006.01) G01N 27/02 (2006.01) G01N 33/02 (2006.01) G01R 27/26 (2006.01)
Patent
CA 2005941
ABSTRACT OF THE DISCLOSURE There is disclosed a method of determining the nature or property of a non-metallic material comprising the steps of generating a time-varying electromagnetic field in a primary coil, providing a sensing coil in the vicinity of the electromagnetic field, introducing the non-magnetic material into field whereby a signal is developed in the sensing coil, and detecting the signal developed in the sensing coil and using it to determine the nature or property of said material, the method being characterised by using a frequency for generating said field which will provide a distinguishable change in the reactive component in the signal induced in the sensing coil due to the presence of said material in said electromagnetic field, obviating any substantial voltage induced in the sensing coil due to said electromagnetic field alone, thereby to improve the sensitivity of the system for detecting said change in the reactive component, determining resistive and reactive components of the signal induced in the sensing coil due to the complex impedance of the material as the material is passed through said field, using said components of the complex impedance to determine the nature or a property of the non-metallic material and a sensing head comprising first coil means for generating a time-varying electromagnetic field, second coil means adjacent said first coil means and in which a voltage is induced due to said field only, said first and second coil means both encompassing a region through which a non-metallic material can be passed, and third coil means adjacent said first coil means but not encompassing said region, said third coil means being dimensioned so that an opposite voltage is induced therein to substantially offset the voltage induced in said second coil means.
Gowling Lafleur Henderson Llp
Loma Group Limited
LandOfFree
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