Dynamic Emission Source Transient Electromagnetic Detection for UXO
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Solution Overview
Problem
Existing detection technologies are inadequate for accurately and efficiently locating unexploded ordnance, posing risks to human life and health and environmental concerns due to the presence of unexploded chemical weapons.
Innovation Solution
A transient electromagnetic field detection method and apparatus using a transmitting coil and receiving coils to generate and detect magnetic fields, calculating apparent resistivity distributions to identify unexploded ordnance by analyzing induced electromotive force signals and spatial distribution maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single static emission source is used for detection, then the device complexity is reduced, but the measurement precision and exploration accuracy deteriorate
Solution Approach 1:
The transmitting coil is divided into multiple dipoles (first dipole, second dipole, third dipole, fourth dipole) arranged in a specific spatial configuration. Each dipole acts as an independent emission source, allowing the system to achieve high measurement precision through segmented source detection while maintaining relatively simple device structure
Solution Approach 2:
Multiple dipoles are combined to form a single transmitting coil structure that can simultaneously generate electromagnetic fields from multiple emission sources. This merging approach enables the system to achieve both high exploration accuracy through multi-source detection and reduced device complexity by integrating all sources into one coil assembly
2Measurement precision
If multiple emission sources are used to improve detection accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
Multiple dipoles are merged into a single transmitting coil structure with integrated windings and common electrical connections. This allows the system to achieve high detection accuracy through multiple emission sources while avoiding the complexity of separate coil assemblies, as all dipoles share common structural and electrical features
Solution Approach 2:
The transmitting coil structure serves multiple functions simultaneously: it acts as the electromagnetic field generation device, the positioning reference for dipoles, and the integrated detection system. This multi-functionality reduces device complexity by eliminating the need for separate structural supports and alignment mechanisms
3Adaptability or versatility
If dynamic emission sources are used instead of static sources, then the adaptability improves for complex terrains, but the device complexity increases
Solution Approach 1:
The dipole configuration within the transmitting coil is designed to be adjustable and reconfigurable, allowing the emission sources to be dynamically positioned according to terrain conditions. This dynamic capability enables the system to adapt to complex terrains while maintaining relatively simple device structure through flexible rather than rigid adjustment mechanisms
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 method provides accurate and efficient detection of unexploded ordnance, improving exploration accuracy and efficiency by reflecting the real underground situation through apparent resistivity spatial distribution maps, suitable for complex terrains like mountainous areas.
Implementation Method 1
conducting the transmitting coil with a second electric current to transmit a second detecting signal to the detection region
Implementation Method 2
respectively acquiring a plurality of second feedback signals at a plurality of second feedback time points, the second feedback signals being second induced electromotive force signals of the second receiving coil
Data Source
AI summary
A detection method for discovering an unexploded ordnance includes: surrounding a detection region with a transmitting coil and surrounding a detection site with a second receiving coil; conducting the transmitting coil with a second electric current; respectively acquiring a plurality of second feedback signals at a plurality of second feedback time points; partitioning the transmitting coil into a plurality of dipoles, and acquiring a plurality of distance values r respectively between the plurality of dipoles and the detection site; respectively calculating feedback depths according to feedback time periods; respectively calculating apparent resistivity values corresponding to the feedback depths; obtaining an apparent resistivity distribution in depth at the detection site according to the apparent resistivity values and the feedback depths; and judging whether there is any unexploded ordnance at the detection site according to the apparent resistivity distribution in depth.