Magnetic Flow Sensor Electrode Porous Metal Halide
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Solution Overview
Problem
Existing fluid flow sensors require large amounts of metal halide to maintain reliable operation over extended periods, leading to increased series resistance and manufacturing costs, making them less attractive and prone to noise performance issues.
Innovation Solution
Incorporating a metal element, a metal halide element, and an electrically conductive porous element to hinder the loss of the metal halide and provide a stable electrical path, with the porous element having a lower resistivity than the metal halide, allowing for extended longevity without compromising noise performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If large amounts of metal halide are included in the electrode to provide extended operating lifetime, then the operating longevity is improved, but the series resistance increases and noise performance deteriorates
Solution Approach 1:
The patent employs a porous metal halide element instead of dense metal halide. The porous structure provides a large surface area that slows down the dissolution rate of metal halide into the fluid, thereby extending operating longevity. Simultaneously, the porous structure maintains adequate electrical conductivity to prevent excessive series resistance, thus preserving noise performance. The porous element acts as a buffer that releases metal halide ions gradually over time.
Solution Approach 2:
The electrode is constructed as a composite structure combining a metal element, metal halide element, and porous element. The metal element provides structural support and initial electrical conductivity. The metal halide element provides stable electrical contact and electrochemical activity. The porous element modifies the dissolution rate and maintains conductivity. This composite approach allows optimization of multiple properties simultaneously - longevity, conductivity, and noise performance.
2Duration of action of stationary object
If large amounts of metal halide are included in the electrode to provide extended operating lifetime, then the operating longevity is improved, but the manufacturing cost increases
Solution Approach 1:
The porous metal halide element reduces the total quantity of metal halide material required compared to using dense metal halide. The porous structure achieves extended longevity through its geometric configuration rather than through high material density, thereby reducing material costs while maintaining the desired operating lifetime.
Solution Approach 2:
The patent changes the physical parameters of the metal halide from dense to porous form. This parameter change allows the same longevity performance to be achieved with reduced material quantity, lowering manufacturing costs. The porous structure provides a higher surface area to volume ratio, which slows dissolution rates without requiring excessive material amounts.
3Duration of action of stationary object
If more metal halide is incorporated to extend operating lifetime, then the operating longevity is improved, but the device complexity increases
Solution Approach 1:
The patent merges the metal element, metal halide element, and porous element into a single integrated electrode assembly. The porous metal halide element combines the functions of structural support, electrical conductivity, and controlled dissolution into one component, reducing the need for separate elements and simplifying the overall electrode structure despite the multi-material composition.
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
The solution provides fluid flow sensors with increased operating longevity and improved noise performance, reducing the need for excessive metal halide and lowering manufacturing costs, while maintaining reliable electrical contact and stability.
Implementation Method 1
an at least partially electrically conductive porous element, said porous element being operable to at least partially hinder progressive loss of the metal halide element to the flow of the fluid
Implementation Method 2
to provide an electrically conductive path between the flow of the fluid and the metal halide element and thereby to the metal element
Implementation Method 3
a magnetic assembly indicated generally by 30 for applying a transverse magnetic field 70 in a region of the tube 20 in which the flow F occurs in operation
Implementation Method 4
The electrodes 40a, 40b are operable to sense a potential difference V denoted by an arrow 80 in a second axis, the second axis being substantially orthogonal to the first axis and to the direction of flow F. The potential difference V is generated in operation on account of the fluid flowing in the tube 20 including oppositely-charged free charge carriers, these free charge carriers being affected mutually differently by the magnetic field 70 to generate the potential difference V
Data Source
AI summary
There is described a fluid flow sensor (10)for sensing a flow (F) of a fluid (120) through a region. The sensor (10) comprises a magnetic circuit (50, 60a, 60b) for applying a magnetic field (70) to the region, and electrodes (40a, 40b) for sensing a potential (V) generated in operation between the electrodes (40a, 40b) in response to the fluid (120) flowing through the magnetic field (70). Each electrode (40) includes a metal element (130; 300; 400; 500), a metal halide element (110; 310; 320; 410; 520), and an electrically conductive porous element (100; 330; 420; 530). The porous element (100; 330; 420; 530), hinders progressive loss of the metal halide element (110; 310, 320; 410; 520), to the flow (F) and provides an electrically conductive path between the flow (F) and the metal halide element (110; 310; 320; 410; 520), and thereby to the metal element (130; 300; 400; 500). Inclusion of the porous element (100; 330; 420; 530) provides the sensor (10) with increased operating longevity without compromising its measurement noise performance.