Inflatable Conductive Sensor for Nonconductive Liquid Leak Detection
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Solution Overview
Problem
Existing detection systems for electrically non-conductive liquid leaks, such as those using variations in electromagnetic characteristics or reactive materials, face limitations in speed, sensitivity, manufacturing complexity, fragility, and reliability, especially in harsh environments.
Innovation Solution
A sensor element comprising a material that swells with electrically conductive particles, becoming conductive when not contaminated and losing conductivity upon contact with the liquid, connected to an electronic management module for ohmic measurement, allowing for faster detection and simpler, more robust implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic characteristics variations are used for detection, then detection capability is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces complex electromagnetic detection systems with a simpler conductivity-based detection mechanism. Instead of measuring electromagnetic characteristics variations, the system uses a sensing element whose electrical conductivity changes when it swells upon contact with liquid, providing a direct and simple detection method that reduces manufacturing complexity while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from electromagnetic characteristics to electrical conductivity. The sensing element transitions from a non-conductive state to a conductive state when it swells and contacts with liquid, creating a clear binary signal that is easier to detect and process, thereby simplifying the overall system while improving reliability
2Reliability
If reactive material swelling is used for detection, then liquid contact detection is achieved, but detection delay increases
Solution Approach 1:
The patent uses a thin-walled envelope structure for the sensing element that allows rapid penetration by liquid. The thin wall design minimizes the time required for liquid to reach the reactive material inside, significantly reducing detection delay while maintaining the swelling mechanism for accurate liquid contact detection
Solution Approach 2:
The sensing element is pre-positioned and ready within the envelope structure, with the reactive material already in place to immediately respond upon liquid contact. This preliminary arrangement eliminates setup time and ensures rapid detection as soon as liquid penetrates the envelope
3Reliability
If precise wire positioning is required, then short circuit prevention is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces an insulating sheath as an intermediary element that physically separates the conductive wires and prevents short circuits. This sheath acts as a barrier that eliminates the need for precise wire positioning, as the insulating layer ensures electrical isolation regardless of wire placement variations, thereby simplifying manufacturing while maintaining reliability
4Reliability
If complex sensor structure is used, then detection functionality is achieved, but fragility in harsh environments increases
Solution Approach 1:
The patent divides the sensor into distinct functional segments: an outer envelope structure for protection, a sensing element for detection, and conductive wires for signal transmission. This segmentation allows each component to be optimized for its specific function and makes the overall system more robust, as damage to one segment does not necessarily compromise the entire sensor in harsh environments
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
This solution enables faster detection of leaks with improved sensitivity and robustness, reduced manufacturing complexity, and the ability to reuse sensors, while being less susceptible to thermal or mechanical issues, and can be implemented in various configurations for different applications.
Implementation Method 1
a material which swells when it is in contact with said liquid and which is charged with electrically conductive particles
Implementation Method 2
the sensing member is conductive when it is not contaminated by said non-conductive liquid, and that it loses its conductivity when it swells
Data Source
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AI summary
The invention relates to a detecting element (200) used for detecting leaks of electrically nonconductive liquid, in particular of hydrocarbons, as well as a detection cable (500) and a detection system (590-790) using such a detecting element. The detecting element (200) includes a detection member (114) made of a material, such as silicone, which inflates upon contact with said liquid and which is loaded with electrically conductive particles, such as to be conductive when not contaminated by said liquid, and such as to lose the conductivity thereof when inflating from contact with said liquid. Said detection member (114) is electrically connected to an electronic management module (210), which is arranged for detecting the presence of said liquid by noticing a decrease in the conductivity of said detection member, typically by means of an ohmic measurement. In a preferred embodiment, the detection cable includes four insulated conductive wires, one of which is embedded in the detection member (114) which is itself protected by an inflatable casing (116), which is also insulating and water-proof. Said four conductive wires (106, 110, 424, 424) are twisted around a fifth insulated conductive wire, the whole being surrounded by a perforated extruded sheath (116).