Electromagnetic Flow Transducer Layout for 2D Velocity Measurement
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Solution Overview
Problem
Conventional electromagnetic transducers, such as FDFMs, are unable to simultaneously measure multiple velocity components of electrically conductive fluids, especially in dense and high-temperature environments, and are limited to one-dimensional measurements.
Innovation Solution
An electromagnetic transducer with a cylindrical metal tube core and strategically arranged receiver coils or Hall effect sensors, allowing for the measurement of two-dimensional velocity components by electromagnetic flux distortion without interference from other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electromagnetic transducers (FDFM) are used to measure velocity components, then measurement reliability in dense and high-temperature environments is improved, but the measurement capability is limited to single velocity component (one-dimensional)
Solution Approach 1:
The transducer is segmented into multiple independent measurement systems arranged in different spatial orientations. Each segment (measurement system) independently measures one velocity component, and the combination of segments enables multi-component measurement capability while maintaining the reliability of individual electromagnetic measurement systems in harsh environments.
Solution Approach 2:
Multiple electromagnetic measurement systems are merged into a single integrated transducer assembly. The systems are positioned and oriented to measure different velocity components simultaneously, combining their individual measurement capabilities into a unified multi-functional device that can measure two-dimensional velocity fields.
2Adaptability or versatility
If multiple electromagnetic transducers are used to measure multiple velocity components, then measurement capability is improved, but device complexity and mutual interference increase
Solution Approach 1:
Multiple measurement systems are nested within a shared cylindrical core structure. The systems are arranged concentrically or in integrated configurations that minimize spatial requirements and reduce overall device complexity while enabling simultaneous multi-component measurements without mutual interference.
Solution Approach 2:
The measurement systems are positioned asymmetrically at specific locations around the core with optimized orientations. This asymmetric arrangement allows each system to measure a specific velocity component independently while minimizing magnetic field interference between systems, reducing the need for complex shielding and interference mitigation.
3Device complexity
If conventional FDFM is used, then structural simplicity is maintained, but signal processing complexity increases for tomographic methods
Solution Approach 1:
The transducer provides direct dynamic measurements of velocity components through electromagnetic induction principles. By measuring the induced voltages in multiple coils simultaneously and applying straightforward mathematical relationships, the system obtains velocity components directly without requiring complex tomographic reconstruction algorithms, thus simplifying signal processing while maintaining structural simplicity.
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
Enables simultaneous measurement of two velocity components of electrically conductive fluids, suitable for dense and high-temperature fluids, and can operate in large volumes, with simpler signal processing compared to tomographic methods.
Implementation Method 1
The operating principle of electromagnetic transducers is illustrated by the expression of Ohm's law in a moving fluid subjected to a magnetic field. It shows that the conductivity σ of the fluid leads to the development of currents (electric current density J) under the action of the velocity of movement u combined with the external magnetic field B
Implementation Method 2
The current densities Ju are the source of a magnetic field Bu. This field Bu distorts the external field B
Implementation Method 3
four Hall effect sensors, each arranged on one of the flat surfaces
Data Source
AI summary
An electromagnetic transducer intended to measure two-dimensional velocity components of a flow of an electrically conductive fluid. An electromagnetic transducer intended to measure the two-dimensional velocity components of a flow of an electrically conductive fluid, including a cylindrical metal tube forming a core with high magnetic permeability, which tube extends along a central axis (Z), including a central portion and two end portions, on either side of the central portion, each including two bosses, diametrically opposed to one another relative to the central axis (Z) and each delimiting a flat surface, parallel to the central axis (Z); an electrical coil, called primary coil, wound around the central portion of the tube; four electrical coils, called receiver coils, each wound around one of the flat surfaces, or four Hall effect sensors, each arranged on one of the flat surfaces.