Method and apparatus for evaluating measuring signals
AssigneeAMEPA Angewandte Messtechnik und Prozessautomatisierung GmbH
InventorEdmund Julius
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Abstract
A method for evaluating measuring signals of an electromagnetic field is disclosed which is in interaction with an electrically conductive fluid for detecting components in the fluid which differ from the electric conductivity of the fluid, with the measuring signals being divided into at least two channels and being evaluated in order to detect different distributions and concentrations in the fluid.
Claims17
A method for evaluating measuring signals of an electromagnetic field which is in interaction with an electrically conductive fluid for detecting components in the fluid which differ with respect to the electric conductivity of the fluid, characterized in that the measuring signals are divided into at least two channels and are evaluated in order to detect different distributions and concentrations in the fluid, characterized in that the electromagnetic field is generated by at least one transmitter coil flowed through by an alternating current, the fluid is a flowing metallic melt and is penetrated at least partly by the field at a measuring point flowed through by the melt and entrained non-metallic components are detected at the measuring point by means of disturbances in the field, with non-metallic components which are entrained in a contiguous fashion in a manner expanded in a direction of flow of the melt being detected in the melt on the basis of disturbances in the electromagnetic field in a first channel above a lower cut-off frequency fGo and simultaneously components distributed discretely in the melt being detected in the melt in a second channel above an upper cut-off frequency fGo.
An apparatus for detecting non-metallic components in a flowing metallic melt with at least one transmitter coil which is flowed through by an alternating current for generating an electromagnetic field which penetrates the flowing melt at least partly, a measuring element for measuring disturbances of the field at a measuring point which is flowed through by the melt and with an evaluating device, characterized by a first filter element which guides the disturbances of the electromagnetic field above a lower cut-off frequency fGu into a first channel with which non-metallic components can be detected which are entrained by the melt and are expanded especially in the direction of flow, and by a second filter element which guides the disturbances of the electromagnetic field above an upper cut-off frequency fGo into a second channel with which components can be detected which are distributed in the melt and are entrained in a discrete manner.
Dependencies are inferred from the claim text.