Apparatus and method for detection of foreign bodies in...

G - Physics – 01 – N

Patent

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Details

G01N 22/00 (2006.01) G01N 22/02 (2006.01) G01N 33/02 (2006.01)

Patent

CA 2384831

The present invention relates to an apparatus for detection of foreign bodies or changes in material properties and contents in a product, comprising a first antenna device for transmitting electromagnetic signals in the microwave range, said signals comprise at least two signals at different frequencies, a second antenna device for receiving signals originating from said first antenna, said received signals, at least partially, passes through said product, means for measuring at least amplitude and phase information of said received signals for each separate frequency, so as to obtain parameter values, means for comparing the parameter value with the corresponding amplitude and phase information of said transmitted signals, so as to obtain a comparison value for each of said frequencies, means for analysing each comparison value based on a reference value, which reference value is accessible to said apparatus, and means for emitting a signal when said comparison value differs a predetermined amount from said reference value. The invention also relates to a method for detection of foreign bodies in products. The invention also relates to a method using said apparatus.

La présente invention concerne un dispositif de détection de corps étrangers ou de changements des propriétés et du contenu d'un produit, comprenant une première antenne servant à émettre des signaux électromagnétiques dans la gamme des micro-ondes, lesquels signaux comprennent au moins deux signaux de fréquences différentes, une seconde antenne destinée à recevoir les signaux provenant de la première antenne, les signaux reçus traversant au moins partiellement ledit produit, des éléments mesurant au moins l'amplitude et la phase desdits signaux reçus pour chaque fréquence séparément afin d'obtenir des valeurs de paramètre, des éléments de comparaison desdites valeurs avec l'amplitude et la phase correspondantes des signaux émis afin d'obtenir une valeur de comparaison pour chacune desdites fréquences, des éléments d'analyse de chaque valeur de comparaison en fonction d'une valeur de référence accessible audit dispositif, et des éléments d'émission d'un signal lorsque la différence entre la valeur de comparaison et la valeur de référence est supérieure à une quantité déterminée. L'invention concerne également un procédé de détection de corps étrangers dans des produits. L'invention concerne en outre un procédé d'utilisation dudit dispositif.

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