Magnetic-Inductive Flow Meter Dual-Field Measurement
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Solution Overview
Problem
Existing magnetic-inductive flow meters often require separate measurements for flow rate and fill level, which can be time-consuming and inefficient, and may not accurately correct for partial filling of the measuring line.
Innovation Solution
The design incorporates two magnetic fields, one perpendicular and one parallel to the flow line, allowing simultaneous measurement of flow rate and fill level through distinct frequency alternating magnetic fields, with strip-shaped electrodes to enhance sensitivity and reduce interference, and an evaluation device for frequency-selective signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate measurements are used for flow rate and fill level, then measurement accuracy for each parameter can be maintained, but measurement time increases and efficiency decreases
Solution Approach 1:
The patent combines flow rate measurement and fill level measurement into a single simultaneous measurement process. Two magnetic field generation devices operate together: one generates a magnetic field perpendicular to the flow direction for flow rate measurement, while another generates a magnetic field parallel to the flow direction for fill level measurement. Both measurements are performed simultaneously using the same measuring line and electrodes, eliminating the need for separate measurement sequences and reducing total measurement time while maintaining accuracy for both parameters.
Solution Approach 2:
The measuring line and electrodes serve dual functions: they are used for both flow rate measurement (by detecting voltage induced from the perpendicular magnetic field) and fill level measurement (by detecting voltage induced from the parallel magnetic field). This multi-functionality allows both parameters to be measured simultaneously with the same hardware, improving efficiency without compromising measurement precision.
2Measurement precision
If partial filling of the measuring line occurs, then measurement of flow rate becomes inaccurate, but complete filling is not always achievable in practice
Solution Approach 1:
The patent uses the measured fill level information (obtained from the parallel magnetic field measurement) as feedback to correct the flow rate measurement. The system continuously monitors the fill level and applies appropriate correction factors to the flow rate calculation, ensuring accurate flow rate measurements even when the measuring line is only partially filled. This feedback mechanism allows the system to adapt to varying filling conditions while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the measurement parameters by introducing a second magnetic field orientation (parallel to flow direction) that is sensitive to fill level. By measuring both the perpendicular component (for flow rate) and parallel component (for fill level) of the magnetic field interaction, the system obtains two independent measurements simultaneously. This parameter change enables the system to compensate for partial filling effects and maintain accuracy across different operating conditions.
3Loss of time
If additional magnetic field generation devices are added for fill level measurement, then fill level can be measured simultaneously, but device complexity increases
Solution Approach 1:
The patent segments the magnetic field measurement function into two independent components: one magnetic field generation device oriented perpendicular to the flow direction for flow rate measurement, and another oriented parallel to the flow direction for fill level measurement. This segmentation allows each device to be optimized for its specific measurement function while operating simultaneously, achieving efficient simultaneous measurement without requiring a completely integrated complex system.
Solution Approach 2:
The patent adds another dimension to the magnetic field measurement approach by introducing a second spatial orientation (parallel to flow direction) in addition to the traditional perpendicular orientation. This dimensional expansion enables simultaneous measurement of both flow rate and fill level using distinct magnetic field orientations, achieving enhanced functionality while keeping each individual magnetic field generation device relatively simple in design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables simultaneous and accurate measurement of flow rate and fill level, improving measurement efficiency and reducing the need for separate calibrations, while minimizing interference from partial filling and local disturbances.
Implementation Method 1
applying the principle of electrodynamic induction to measure the flow velocity of a flowing medium. According to Faraday's law of induction, an electric field strength perpendicular to the flow direction and perpendicular to the magnetic field is generated in a flowing medium that carries charge carriers and flows through a magnetic field.
Implementation Method 2
at least one additional magnetic field generation device – in particular arranged outside the measuring line – is provided for generating an additional magnetic field that at least partially penetrates the measuring line
Data Source
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AI summary
The flow meter (1) has a magnetic field generation device (4) for generating alternating magnetic field passing partially through a measuring conduit (3) perpendicular to longitudinal axis (5) of measuring conduit. Two electrodes (6) are used to measure voltage induced in a flowing medium (2). A supplementary magnetic field generation device (7) is used to generate alternating supplementary magnetic field passing through measuring conduit, in parallel to longitudinal axis of measuring conduit in a region of measuring conduit in which electrodes are located.