Multicolumn Capacitive Liquid-Level Gauge With Reduced Wiring
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Solution Overview
Problem
Existing water level sensors require a large number of electrodes and conducting lines to achieve high resolution, leading to a cumbersome and complex setup.
Innovation Solution
A sensor configuration with a reduced number of conducting lines by using a specific arrangement of sensor blocks and electrical conductors, allowing for high-resolution water level detection with fewer connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of pairs of electrodes are arranged to locate water level with high resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor probe is divided into multiple sensor blocks along the level change direction, with each block containing multiple electrodes. This segmentation allows the system to achieve high-resolution water level detection by processing signals from distributed electrode groups, reducing the need for a single large array of electrodes while maintaining measurement precision.
Solution Approach 2:
The patent transitions from a one-dimensional linear arrangement of electrodes to a multi-dimensional structure where electrodes are organized in blocks with both longitudinal (along level change) and lateral arrangements. This dimensional transformation enables more efficient use of electrodes, achieving the same or better resolution with fewer total components.
2Measurement precision
If Z pairs of electrodes are arranged to locate water level with high resolution, then measurement precision is improved, but quantity of conducting lines increases
Solution Approach 1:
Electrodes on one side of each sensor block are connected to a common conducting line, while electrodes on the other sides are connected to individual conducting lines. This merging approach reduces the total number of conducting lines required, as the common line serves multiple electrodes simultaneously, thereby reducing the conducting line count from Z+1 to fewer than Z+1 lines.
Solution Approach 2:
The common conducting line serves multiple electrodes within each sensor block, making it a multi-functional conductor. This universal connection approach allows a single conducting line to perform the function of multiple individual connections, reducing the overall quantity of conducting lines needed in the system.
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 reduces the total number of conducting lines required, simplifying the setup and improving detection accuracy with fewer components.
Implementation Method 1
determining the presence or absence of liquid at each of levels of two or more observation points, which are set in a direction in which a water level changes, on the basis of a capacitance value of each of two or more pairs of electrodes
Data Source
AI summary
A sensor unit includes n columns of sensors in which electrodes forming capacitance with a grounded conductor are arranged. A sensor in a first column has a1 division regions. A second column has a1 regions which correspond to the division regions in the first column, where each of the regions has a2 division regions. An n-th column has regions whose number is obtained by multiplying numbers from a1 to an−1 and which correspond to division regions in an n−1-th column, where each of the regions has an division regions. The electrodes are placed at boundaries of regions and at boundaries of division regions. As for the electrodes in second and subsequent columns, electrodes placed at boundaries of regions are connected in parallel with each other and electrodes placed at same boundaries of division regions in respective regions are connected in parallel with each other, so as to constitute a plurality of groups.