Microwave apparatus and method for measuring fluid mixtures

G - Physics – 01 – N

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G01N 22/00 (2006.01) G01N 33/28 (2006.01)

Patent

CA 2059533

Apparatus for measuring the concentration of one material such as water in another material such as crude or refined oil including a coaxial microwave transmission line (14) formed by a conduit for receiving the material and a center conductor (22) which is sheathed with a dielectric covering (27) which is operable to prevent short circuiting of the transmission path. An oscillator circuit (30) is coupled to the transmission line and is driven by a free-running voltage controlled oscillator and a signal receiver monitors the change in frequency caused by impedance pulling of the oscillator due to the change in the dielectric constant of the mixture. Incident and reflected or transmitted power with respect to the measurement section is measured to determine whether an oil-in-water or water-in-oil emulsion is present to verify the concentration of one fluid in the other for a particular operating frequency.

Un appareil de mesure de la concentration d'un matériau, tel que de l'eau, dans un autre matériau, tel que du pétrole brut ou raffiné, comprend une ligne coaxiale (14) de transmission de micro-ondes formée d'un conduit qui reçoit le matériau et d'un conducteur central (22) protégé par une gaine diélectrique (27) qui sert à éviter des courts-circuits dans la voie de transmission. Un circuit oscillateur (30) couplé à la ligne de transmission est commandé par un circuit astable commandé en tension. Un récepteur de signaux contrôle les changements de fréquence dus à l'entraînement de l'impédance de l'oscillateur provoqué par des changements de la constante diélectrique du mélange. La puissance incidente et réfléchie ou transmise par rapport à la section de mesure est mesurée afin de déterminer si une émulsion d'huile dans l'eau ou d'eau dans l'huile est présente et de vérifier la concentration d'un fluide dans un autre à une fréquence particulière de fonctionnement.

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