Method and device for measuring density

G - Physics – 01 – N

Patent

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Details

G01N 9/24 (2006.01) G01N 33/46 (2006.01) G01N 9/36 (2006.01)

Patent

CA 2250267

The present invention relates to a device for measuring density or determining the presence and the amount of materials of different density in an object (9, 18) to be measured, of a solid, liquid or gaseous material, said device comprising at least one source of radiation (5, 12) for emitting electromagnetic radiation, and at least one sensor (6, 13) for measuring the radiation intensity, so positioned as to absorb radiation from the source of radiation (5, 12) and being connected to a calculation unit (8, 16). In accordance with the invention the device emits radiation of at least two wavelengths and comprises measurement means for determination of the extension of the object (9, 18) between the source of radiation (5, 12) and the sensor (6, 13). In addition, the invention relates to a method of measuring density, comprising radiating electromagnetic rays through an object (9, 18) to be measured and measuring the radiation intensity on the ray-exit side of the object (9, 18) to be measured. In accordance with the method the extension of the object (9, 18) is measured along the path of the radiation through the object to be measured and the radiation is effected at least at two different wavelengths.

L'invention porte sur un dispositif de mesure de la densité ou de détection de la présence et de la quantité de matériaux de densités différentes dans un objet (9, 18) à évaluer qu'il s'agisse de liquides, de solides ou de gaz. Ledit dispositif comporte au moins une source (5, 12) de rayonnement électromagnétique, et au moins un détecteur (6, 13) de mesure de l'intensité du rayonnement, placé de manière à absorber le rayonnement de la source (5, 12) et relié à une unité de calcul (8, 16). Selon l'invention, le dispositif émet des rayons de deux longueurs d'ondes et comprend des moyens de mesure permettant de déterminer l'étendue de l'objet (9, 18) entre la source (5, 12) et le détecteur (6, 13). En outre, l'invention porte sur un procédé de mesure de la densité consistant à irradier par des rayons électromagnétiques un objet (9, 18) à évaluer, puis à mesurer l'intensité du rayonnement du côté où les rayons sortent de l'objet (9, 18). Selon le procédé, on mesure l'étendue de l'objet (9, 18) le long de la trajectoire des rayons à travers l'objet à mesurer, le rayonnement étant émis au moins sur deux longueurs d'ondes distinctes.

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