초록 ▼

An ultrasonic device for detecting concentrations of solids or positions of solid/liquid interfaces in liquid media, particularly Bayer process liquids. The device comprises at least one piezoelectric element provided with electrodes; electrical circuit elements connected to the electrodes for conve

An ultrasonic device for detecting concentrations of solids or positions of solid/liquid interfaces in liquid media, particularly Bayer process liquids. The device comprises at least one piezoelectric element provided with electrodes; electrical circuit elements connected to the electrodes for conveying electrical signals, in use, to and from control apparatus; an ultrasound-transparent window, made of glassy carbon, positioned adjacent to the or each piezoelectric element; a protective matrix, preferably of epoxy resin, embedding and surrounding said the or each piezoelectric element and the electrodes while allowing ultrasonic waves to pass through the or each adjacent window to or from the piezoelectric element, and an external protective cover, preferably comprising an elastomer that is resistant to caustic alkali and has a smooth and non-porous surface, forming an exterior of the device except at the or each window. The use of glassy carbon for the windows makes the probes resistant to corrosion and scaling without impeding the effectiveness of the device. Further improved scaling resistance is provided by an elastomeric material preferably used as the external protective cover.

대표청구항 ▼

[ What we claim is:] [1.] An ultrasonic device for detecting concentrations of solids or positions of solid/liquid interfaces in corrosive and scaling liquid media, comprising: at least one piezoelectric element provided with electrodes; electrical circuit elements connected to said electrodes for c

[ What we claim is:] [1.] An ultrasonic device for detecting concentrations of solids or positions of solid/liquid interfaces in corrosive and scaling liquid media, comprising: at least one piezoelectric element provided with electrodes; electrical circuit elements connected to said electrodes for conveying electrical signals, in use, to and from control apparatus; an ultrasound-transparent window made of glassy carbon, said at least one piezoelectric element being adhered to an inner surface of said window; a matrix of epoxy resin embedding and surrounding said at least one piezoelecttric element and said electrodes while allowing ultrasonic waves to pass through said window to or from said at least one piezoelectric element; and an external protective cover forming an exterior of said device except at said window, said cover comprising natural rubber or a mixture of natural and synthetic rubber, having a porosity of less than 1%.