Stacked Sensor for Porous Medium Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sensors face challenges in accurately and efficiently measuring dielectric influences and characteristics of porous media, particularly in detecting small changes in volumetric liquid content and salinity, across various types of porous materials and liquids, with limited precision and speed.
Innovation Solution
A stacked sensor design utilizing porous ceramic elements with different liquid release curves, electrically conductive interface plates, and conductors, which form a longitudinal cavity to establish electrical contact and measure complex impedance, allowing for precise and rapid detection of dielectric influences and characteristics in porous media.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensor element is used to test porous medium, then the device complexity is low, but the measurement precision and speed are limited
Solution Approach 1:
The sensor is divided into multiple discrete porous ceramic elements (at least two elements) stacked vertically, each element contributing to the overall measurement capability. This segmentation allows each element to respond independently to dielectric changes while collectively providing enhanced measurement precision through differential signaling.
Solution Approach 2:
The sensor transitions from a single-element design to a multi-element vertical stack configuration. By adding the vertical dimension with stacked elements having different liquid release curves, the system achieves improved measurement precision without significantly increasing horizontal footprint or overall complexity.
2Productivity
If multiple porous ceramic elements with different liquid release curves are stacked, then the response time and sensitivity are improved, but the device complexity increases
Solution Approach 1:
The sensor employs multiple porous ceramic elements with distinct liquid release curves, where each element segments the response function. This allows different elements to respond at different rates to moisture changes, providing both fast response and comprehensive measurement coverage.
Solution Approach 2:
Each porous ceramic element is designed with different liquid release curve parameters (such as pore size distribution, hydrophobicity, or surface treatment), creating a gradient of response characteristics. This parameter variation enables the stack to capture a broader range of moisture conditions with faster overall response time.
3Measurement precision
If electrically conductive interface plates are used to establish contact with porous ceramic elements, then the measurement precision is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The interface plates are designed with localized conductive regions that align with specific porous ceramic elements. By concentrating the conductive contact area at specific locations rather than requiring uniform precision across the entire interface, the system achieves reliable electrical contact with reduced manufacturing tolerance requirements.
Solution Approach 2:
The interface plates serve as intermediary components between the porous ceramic elements and the external measurement circuitry. These plates provide a stable, conductive interface that mediates the electrical connection, ensuring consistent contact pressure and signal transmission without requiring direct precision between the ceramic elements and measurement equipment.
4Speed
If the sensor elements are stacked to increase measurement capability, then the detection speed improves, but the loss of time in assembly and calibration increases
Solution Approach 1:
The modular segmented design of individual porous ceramic elements allows for independent pre-characterization and calibration of each element before assembly. This segmentation enables parallel calibration processes and simplifies the overall assembly procedure, as each element can be individually handled and positioned.
Solution Approach 2:
The liquid release curves and electrical contact characteristics of the porous ceramic elements are predetermined and characterized before final assembly. This preliminary characterization allows for pre-configured assembly procedures and reduces on-site calibration time, as the elements are designed to interface with specific conductive plates with known geometric and electrical properties.
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 precise and quick measurements of dielectric influences and characteristics in porous media, including small changes in liquid content and salinity, across a wide range of materials and liquids, with improved sensitivity and response time.
Implementation Method 1
Each element operates as a discrete variable capacitor
Implementation Method 2
measuring dielectric influences and characteristics of porous media
Implementation Method 3
Each element also exhibits a different known liquid release curve
Implementation Method 4
the first axial openings of the elements combine with the second axial openings of the plates to form a longitudinal cavity within the sensor which is centered along the common axis and extends from a proximal end of the sensor to a distal end of the sensor
Data Source
AI summary
A sensor is provided for testing a porous medium. The sensor includes a plurality of porous elements, a number of electrically conductive interface plates which is one greater than the quantity of elements, and the same number of conductors. Each element operates as a discrete variable capacitor, exhibits a different known liquid release curve, and includes a first axial opening. The elements are stacked one on top of another. Each plate includes a second axial opening. The plates are axially distributed within the sensor such that the first and second axial openings combine to form a longitudinal cavity that extends from the sensor's proximal end to its distal end, and each element is sandwiched between a different pair of plates. A distal end of each conductor is attached to a different one of the plates, and a proximal end is routed through the cavity to the sensor's proximal end.