Microwave apparatus and method for achieving accurate weight...

G - Physics – 01 – G

Patent

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Details

G01G 19/52 (2006.01) G01N 5/04 (2006.01) G01N 1/44 (2006.01)

Patent

CA 2384796

The invention is an apparatus and method for obtaining accurate sample weight measurements during sample heating within a heating cavity by substantially reducing the convection currents that disrupt accurate sample weight measurement. The apparatus includes a heating cavity (11) in which a sample (20) can be placed, a source (12) for introducing microwaves into the heating cavity (11), and an analytical balance (13) for measuring the weight of the sample (20) while the sample is in the cavity (11), and an air shield (14) that is secured to the inside of the heating cavity (11) so that the air shield (14) will not contact the analytical balance (13). The air shield (14), which is made of material that is permeable to microwave radiation and yet absorbent of volatiles, is positioned in the heating cavity (11) to reduce the convection current rising from the sample (20) as the sample is heated.

L'invention concerne un dispositif et un procédé permettant d'obtenir des mesures précises du poids d'un échantillon pendant que l'échantillon est chauffé dans une cavité chauffante, grâce à une réduction sensible des courants de convection qui perturbent la mesure précise du poids de l'échantillon. Le dispositif comprend une cavité chauffante (11) dans laquelle un échantillon (20) peut être placé, une source (12) permettant d'introduire un rayonnement hyperfréquences dans la cavité chauffante (11), une balance analytique (13) pour mesurer le poids de l'échantillon (20) pendant que celui-ci se trouve dans la cavité (11), et un écran d'air (14) fixé à l'intérieur de la cavité chauffante (11) de manière à ne pas toucher la balance analytique (13). L'écran d'air (14), fait d'une matière qui est perméable au rayonnement hyperfréquences et absorbe cependant les matières volatiles, est placé dans la cavité chauffante (11) afin de réduire le courant de convection dégagé par l'échantillon (20) lorsque celui-ci est chauffé.

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