Interface-Position Sensor with Shared Conducting Lines for Level Gauging
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Solution Overview
Problem
Existing water level sensors require a large number of pairs of electrodes and conducting lines to achieve high resolution, leading to a cumbersome and complex setup.
Innovation Solution
A sensor configuration with E pairs of electrodes and L conducting lines, where E and L are determined by specific formulas, allowing for a reduced number of conducting lines while maintaining high resolution by using a conducting line selector to connect electrodes to conducting lines in a specific pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of pairs of electrodes are arranged one-to-one at respective levels of observation points to locate water level with high resolution, then measurement precision is improved, but device complexity increases due to requiring a large number of conducting lines
Solution Approach 1:
Multiple electrode pairs that would normally require separate conducting lines are merged into shared conducting line groups. The patent divides conducting lines into first and second groups, where multiple electrode pairs share common conducting lines within each group, significantly reducing the total number of conducting lines needed while maintaining the ability to detect water levels at multiple observation points with high resolution
Solution Approach 2:
The patent segments the conducting lines into distinct groups (first conducting line group and second conducting line group) and assigns different functions to each group. This segmentation allows systematic management of electrode connections, where each group handles specific measurement tasks, enabling high-resolution detection without requiring a one-to-one mapping between electrode pairs and conducting lines
2Measurement precision
If Z pairs of electrodes and Z+1 conducting lines are used to achieve high resolution water level detection, then measurement precision is improved, but ease of operation deteriorates due to cumbersome setup
Solution Approach 1:
The patent combines multiple electrode pair connections into shared conducting line groups, reducing the total number of conducting lines from Z+1 to fewer than Z+1. This merging simplifies the physical setup and connection process, making the sensor easier to install and operate while preserving high-resolution measurement capabilities through the structured grouping strategy
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
Reduces the total number of conducting lines required to less than the number of observation points, simplifying the sensor setup and maintaining high resolution.
Implementation Method 1
a capacitance value of each of two or more pairs of electrodes which are arranged one-to-one at the levels of the two or more observation points
Data Source
AI summary
A level gauge includes an input circuit, a sensor part, and switching means, the sensor part includes electrode pairs arranged in a liquid level detection direction, the electrode pairs are divided into n groups, the i-th (i=1, 2, . . . , n) group is constituted with an electrode pair at the 2i-1(2k−1)-th (k is a natural number from 1 to 2n-i) position from the lowermost position, one ends of the electrode pairs are connected to the input circuit, and the other ends belonging to the same group are connected to each other in parallel and connected to the switching means.