Ground Potential Electrode Structure for Continuous Contaminant Mapping
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Solution Overview
Problem
Current electric potential measurement systems provide periodic measurements that require stopping, leading to a slow and laborious process, and suffer from polarisation effects when using non-polarisable electrodes, resulting in unstable signals.
Innovation Solution
An electric potential measurement system with a measurement electrode comprising a contact electrode and contact appendage, using a non-metal filler material and a non-metal retaining mesh to minimize polarisation, allowing continuous measurement as the vehicle moves over the ground, and a data acquisition and positioning system for precise electric potential mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic measurement systems are used, then measurement precision can be maintained, but measurement speed decreases and the process becomes laborious
Solution Approach 1:
The measurement system transitions from static periodic measurements requiring stops to dynamic continuous measurements during vehicle movement. The measurement electrode continuously contacts the ground while the vehicle moves, enabling measurements to be taken during motion rather than requiring stationary stops, thus improving productivity while maintaining precision through continuous data acquisition.
Solution Approach 2:
The system implements continuous measurement action rather than periodic intermittent measurement. The measurement electrode maintains continuous contact with the ground during vehicle movement, and the data acquisition system continuously records electric potential values, eliminating the need to stop the vehicle and enabling exhaustive coverage of the surveyed area.
2Reliability
If non-polarisable electrodes are used in periodic measurement systems, then measurement stability improves, but polarisation effect still occurs at the ground-contact interface
Solution Approach 1:
A non-metal filler material acts as an intermediary substance between the metal electrode and the ground. This filler material serves as a mediator that reduces the polarisation effect at the ground-contact interface while maintaining electrical conductivity for signal transmission, thus improving signal stability without suffering from the polarisation problems of direct metal-ground contact.
Solution Approach 2:
The measurement electrode employs a composite structure combining metal electrode, non-metal filler material, and non-metal retaining mesh. This composite material approach creates a multi-layered electrode system where each material contributes specific properties: the metal provides electrical conductivity, the non-metal filler reduces polarisation, and the mesh provides structural support and retention.
3Productivity
If continuous measurement systems with metal wire wheels are used, then measurement speed improves, but polarisation effect significantly degrades measurement precision
Solution Approach 1:
The non-metal filler material serves as an intermediary that eliminates the harmful polarisation effect while maintaining the continuous measurement capability. Unlike direct metal-ground contact in wheel-based systems, the filler material mediates the electrical contact, reducing polarisation and improving precision without sacrificing the continuous measurement advantage.
Solution Approach 2:
The composite electrode structure replaces the simple metal wire wheel with a sophisticated multi-material system. The combination of metal electrode, non-metal filler material, and retaining mesh creates an electrode that maintains continuous contact for high-speed measurement while the non-metal components suppress polarisation effects that would otherwise degrade precision.
4Measurement precision
If the ground is wetted with water before measurement, then electrical conductivity improves, but measurement process complexity increases
Solution Approach 1:
The ground wetting operation is performed as a preliminary action before the measurement process begins. By pre-wetting the ground to improve its electrical conductivity, the system ensures better signal quality during measurement without adding complexity during the actual measurement phase. This preliminary preparation step separates the conductivity enhancement from the measurement operation itself.
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 quick, precise, and stable electric potential measurements with minimal polarisation, providing a continuous and exhaustive map of the ground's electric potential for detecting contaminants like oils without damaging the surface.
Implementation Method 1
an unwanted polarisation effect in the contact between the ground and the measurement equipment occurs when performing measurement
Implementation Method 2
The contact appendage is made of a non-metal material and is suitable for establishing a continuous galvanic contact with the soil as the vehicle moves over the ground to be surveyed
Implementation Method 3
The electric potential of points of a ground depends on several physical properties of the subsoil such as, for example, the electrical resistivity of the materials
Data Source
AI summary
An electric potential measurement system for detecting contaminants in the subsoil, comprising: a reference electrode (2); a vehicle (3); a measurement electrode (4), with: a contact electrode (7) formed by an electrically insulating container (13) including a metal electrode (14) surrounded by a non-metal filler material (15), and a retaining mesh (16) covering the base of the container (13); a non-metal contact appendage (9) establishing continuous galvanic contact with the soil as the vehicle (3) moves over the ground (6); a data acquisition and positioning system (5) which acquires and stores position data (Pi) and electric potential difference measurements (Δvi) between the reference electrode (2) and the measurement electrode (4) in a memory (29). The data stored in the memory can be used to obtain an electric potential map (30) and/or a map (32) with the probability of the presence of contaminants.