In-situ NMR Noise Cancellation via Segmented Detection Coils
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Solution Overview
Problem
Existing in-situ NMR devices struggle to effectively cancel Radio Frequency (RF) or other Electromagnetic (EM) noise, which degrades NMR signal quality, especially in noisy environments like near-surface applications where electromagnetic interference is significant.
Innovation Solution
The implementation of a noise canceling in-situ NMR detection apparatus that includes a static magnetic field generator, an alternating magnetic field generator, an in-situ NMR detection device, and an auxiliary noise detection device, with a computer configured to control and process signals to attenuate noise, using noise canceling antenna designs and digital signal processing to separate NMR signals from noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If in-situ NMR detection is performed in noisy electromagnetic environments, then NMR measurement capability is achieved, but electromagnetic noise degrades signal quality
Solution Approach 1:
The detection system is divided into multiple independent detection coils, each sensitive to different spatial components of the electromagnetic field. By segmenting the detection function across multiple coils, the system can distinguish between NMR signals and noise based on their spatial distribution patterns.
Solution Approach 2:
Different detection coils are positioned at different locations with respect to the NMR sample and noise sources. Each coil has a specific spatial sensitivity profile, allowing the system to exploit local field variations to separate NMR signals from homogeneous noise fields through weighted combination of coil outputs.
2Object-affected harmful factors
If noise canceling detection coils are used, then electromagnetic noise is reduced, but device complexity increases
Solution Approach 1:
Multiple detection coils are combined into a unified noise-canceling detection system with a common signal processing chain. The coils are electrically connected in a specific configuration that enables noise cancellation while sharing power supply, control electronics, and data acquisition resources, thereby limiting the increase in overall system complexity.
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 significantly reduces electromagnetic noise interference, enhancing the quality of NMR measurement data by isolating NMR signals from spatially homogeneous noise fields, thereby improving the accuracy of NMR measurements in noisy environments.
Implementation Method 1
components configured to generate a static magnetic field B0 within a sample of interest
Implementation Method 2
components configured to generate an alternating magnetic field B1 to actuate an NMR process within the sample of interest
Implementation Method 3
components configured to detect the actuated NMR process from within the sample of interest
Data Source
AI summary
Technologies applicable to noise canceling in-situ NMR detection and imaging are disclosed. An example noise canceling in-situ NMR detection apparatus may comprise one or more of a static magnetic field generator, an alternating magnetic field generator, an in-situ NMR detection device, an auxiliary noise detection device, and a computer.