Open Helical Sensor for Dielectric Measurement in Composite Media
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Solution Overview
Problem
Existing sensors face challenges in accurately measuring dielectric influences and characteristics of composite media, particularly in detecting small changes and handling media with high salinity or dissipation, which affects precision and reliability.
Innovation Solution
A helical sensor design featuring three or more conductors wound in a continuous parallel helix around a non-porous, electrically insulative tube, with a dielectric coating and caps to maintain an air-filled environment, allowing for precise dielectric measurements through time-domain reflectometry (TDR) by analyzing pulse phase delays and amplitude differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensors are used to test composite media, then the sensor can detect dielectric influences, but the measurement precision deteriorates when detecting small changes or handling media with high salinity
Solution Approach 1:
The sensor is divided into multiple separate conductors (at least two conductors) that are wound in parallel helices around the tube. This segmentation allows each conductor to interact independently with the dielectric medium, improving the ability to detect small changes in dielectric properties and enhancing reliability in high salinity conditions through differential measurement capabilities.
Solution Approach 2:
The conductors are arranged in a three-dimensional helical configuration around the tube rather than a linear or planar arrangement. This spatial distribution in multiple dimensions increases the effective sensing volume and improves the sensor's ability to detect dielectric influences in composite media while reducing interference from salinity.
2Reliability
If the tube is sealed to maintain air-filled environment, then measurement reliability improves, but device complexity increases due to caps and sealing requirements
Solution Approach 1:
The sensing function is extracted from the sealed tube structure and placed in the open configuration where conductors are wound around the tube without requiring caps. The dielectric coating on the conductors provides the necessary insulation, eliminating the need for sealing components while maintaining measurement reliability through the preserved air-filled environment between conductors and tube.
Solution Approach 2:
The dielectric coating serves as an intermediary layer between the conductors and the external medium, providing electrical insulation and maintaining the air-filled environment without requiring physical seals. This mediator enables the sensor to function reliably in open configuration while preserving the measurement conditions.
3Manufacturing precision
If conductors are wound in continuous parallel helix, then manufacturing precision improves, but device complexity increases due to interleaved conductor arrangement
Solution Approach 1:
Multiple conductors are merged into a single integrated helical structure wound continuously around the tube in parallel. This combining approach ensures uniform spacing and precise positioning of all conductors relative to each other and the tube, improving manufacturing precision while the interleaved arrangement provides the necessary electrical isolation through the dielectric medium.
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, quick measurements of dielectric influences and characteristics in composite media, including small liquid content and salinity, with enhanced reliability and minimal disruption, suitable for various media types and applications.
Implementation Method 1
allowing for precise dielectric measurements through time-domain reflectometry (TDR) by analyzing pulse phase delays and amplitude differences
Implementation Method 2
The tube is non-porous and electrically insulative. Both the proximal end and the distal end of the tube are open. Each conductor runs from a proximal end of the tube section to a distal end of the tube section in a repeating serpentine pattern.
Data Source
AI summary
An open sensor is provided for testing a split sample of a composite medium. The open sensor generally includes a longitudinal section of a tube and a plurality of serpentine conductors which are successively layered on top of each other. The interior surface of the tube section forms a trough into which the split sample of the composite medium can be disposed. The number of serpentine conductors is two or greater.