High-power ultrasound generator and use in chemical reactions

G - Physics – 10 – K

Patent

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Details

G10K 9/128 (2006.01) B01J 19/10 (2006.01) B06B 1/08 (2006.01) C10G 31/00 (2006.01) H04R 15/00 (2006.01)

Patent

CA 2524018

Ultrasound for use in promoting a chemical reaction is generated by an electromagnet formed from a pair of magnetostrictive prongs wound with coils that are oriented to produce an oscillating magnetostrictive force when an oscillating voltage is applied, in conjunction with a sensing electromagnet of magnetostrictive material that is arranged to receive the vibrations generated by the driving electromagnet and produce internal magnetic field changes due to the reverse magnetostrictive effect. These field changes generate voltages that are representative of the amplitude of the oscillating magnetostrictive force. The generated voltage is compared to a target value in a control circuit that adjusts the applied oscillating voltage accordingly. The oscillations in the prongs of the electromagnet are transmitted to an ultrasonic horn that is immersed in the reaction medium to provide direct contact with the reaction mixture.

Les ultrasons destinés à stimuler une réaction chimique sont générés par un électroaimant constitué par une paire de branches magnétostrictives enroulées en serpentins orientés de façon à produire une force magnétostrictive oscillante lors de l'application d'une tension oscillante, en association avec un électroaimant de détection en matériau magnétostrictif qui est conçu pour recevoir les vibrations produites par le électroaimant pilote et pour produire des variations du champ magnétique interne dues à l'effet magnétostrictif inverse. Ces variations du champ magnétique produisent des tensions qui sont représentatives de l'amplitude de la force magnétostrictive oscillante. La tension produite est comparée à une valeur cible dans un circuit de commande qui règle la tension oscillante appliquée en fonction de ces variations. Les oscillations dans les branches de l'électroaimant sont transmises à un cornet à ultrasons qui est immergé dans le milieu de réaction pour créer un contact direct avec le mélange de réaction.

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