Distributed NMR Groundwater Detection via Drone Array
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Solution Overview
Problem
Existing groundwater detection methods using magnetic resonance sounding face challenges such as weak signal acquisition in geomagnetic fields, low efficiency in large-scale detection, and environmental damage from electrode arrangements, along with complex wiring and reduced flexibility.
Innovation Solution
A distributed device and method for nuclear magnetic resonance groundwater detection, featuring an excitation apparatus, multiple polarization apparatuses, an aerial reception apparatus, and a control apparatus, which includes an array cooled coil sensor and drone for efficient signal enhancement and acquisition, reducing the need for frequent coil arrangement and minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic resonance sounding is performed under a geomagnetic field, then the detection can be conducted, but the signal is weak and it is difficult to acquire an effective magnetic resonance signal
Solution Approach 1:
The patent applies preliminary action by introducing a pre-polarization field generation module that generates a strong polarization field before the actual detection. This pre-polarization field enhances the magnetic resonance signal of groundwater in advance, making the subsequent signal acquisition more effective and stronger, thus resolving the contradiction between signal strength and detection effectiveness in geomagnetic fields
Solution Approach 2:
The patent uses an intermediary approach by introducing a polarization field as a mediator between the excitation source and the groundwater target. The polarization field acts as an intermediate that enhances the interaction between the detection system and groundwater, thereby strengthening the magnetic resonance signal without directly contacting the groundwater, thus improving signal acquisition effectiveness
2Area of stationary object
If detection is performed at multiple positions in a large range, then comprehensive detection coverage is achieved, but the efficiency is low
Solution Approach 1:
The patent applies segmentation by dividing the detection system into multiple independent detection modules that can be distributed at different positions. Each module contains its own excitation and reception components, allowing parallel detection at multiple locations simultaneously. This segmented architecture enables comprehensive coverage of large areas while maintaining high detection efficiency through concurrent operations
Solution Approach 2:
The patent transitions from a single-point detection approach to a distributed spatial array configuration. By arranging multiple detection modules in space and utilizing a three-dimensional detection architecture with aerial platforms, the system achieves comprehensive area coverage while maintaining efficiency through parallelized multi-position detection operations
3Reliability
If electrodes are arranged in the detection region to enhance detection, then detection capability is improved, but the process becomes complicated and flexibility is reduced
Solution Approach 1:
The patent extracts and eliminates the complex electrode arrangement system from the detection configuration. Instead of using multiple electrodes that require precise positioning and complex wiring, the system employs a simplified coil-based magnetic resonance detection approach. This extraction of the electrode component significantly reduces process complexity while maintaining detection capability through alternative magnetic field interaction mechanisms
Solution Approach 2:
The patent replaces the mechanical electrode arrangement system with a magnetic field-based detection system. Instead of physically placing and connecting multiple electrodes, the system uses transmission coils and reception coils that generate and detect magnetic fields. This substitution of the mechanical electrode system with an electromagnetic field system simplifies the detection process and improves flexibility
4Measurement precision
If multiple coils are arranged to enhance signal amplitude, then signal-to-noise ratio is improved, but the wiring becomes complex
Solution Approach 1:
The patent applies universality by designing a modular detection module that can be reused at multiple positions. Each module contains integrated transmission and reception coils with standardized connections, allowing the same basic unit to be deployed throughout the detection area. This universal module design reduces wiring complexity compared to having unique coil arrangements at each position, while maintaining high signal-to-noise ratio through consistent multi-channel detection
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
The solution enables fast, non-intrusive, and accurate large-scale groundwater detection with reduced power loss and environmental impact, improving detection speed and efficiency while maintaining high-resolution imaging capabilities.
Implementation Method 1
generate an excitation magnetic field, to generate a magnetic resonance signal indicating groundwater
Implementation Method 2
generate a polarization field to enhance an intensity of the magnetic resonance signal indicating groundwater
Implementation Method 3
receive the magnetic resonance signal indicating groundwater
Data Source
AI summary
A distributed device and method for detecting groundwater based on nuclear magnetic resonance are provided. The device includes an excitation apparatus, multiple polarization apparatuses, an aerial reception apparatus, and a control apparatus. The aerial reception apparatus includes an array cooled coil sensor. For each of the multiple polarization apparatuses, a position analysis module determines, together with a second position analysis module of the polarization apparatus, a position of the array cooled coil sensor relative to a polarization coil in the polarization apparatus. A polarization transmitter in the polarization apparatus switches to a mode of waiting for output in a case that the array cooled coil sensor is in coverage of the polarization coil. The polarization transmitter in the polarization apparatus remains in a standby mode in a case that the array cooled coil sensor is beyond coverage of the polarization coil.