NMR Probe Paramagnetic Dopant Temperature Compensation
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Solution Overview
Problem
Current magnetic field probes for magnetic resonance (MR) applications suffer from significant temperature dependence, leading to inaccurate measurement values due to variations in ambient conditions and heating effects, which complicates field monitoring and quality assurance in MR procedures.
Innovation Solution
A magnetic field probe is designed with a detector liquid containing a paramagnetic dopant, an electrically conductive structure, and a container, where the concentration of the dopant is optimized to minimize temperature dependence of the resonance frequency, achieving a substantially zero temperature derivative of the resonance frequency by carefully balancing the temperature-dependent terms through the use of paramagnetic substances and orientation means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional NMR-based magnetic field probes are used, then magnetic field monitoring is achieved, but temperature dependence causes inaccurate measurement values
Solution Approach 1:
The patent applies parameter changes by carefully selecting the concentration of paramagnetic dopant in the detector liquid to achieve a specific temperature dependence that compensates for frequency shifts. By adjusting the dopant concentration, the probe's resonance frequency temperature coefficient is tuned to counteract the temperature-induced frequency drift, thereby maintaining measurement accuracy across varying temperatures.
Solution Approach 2:
The patent uses a composite detector liquid composed of a base liquid (such as water or fluorinated compounds) combined with paramagnetic dopants (such as gadolinium or dysprosium salts). This composite formulation allows the detector liquid to exhibit tailored magnetic properties and temperature dependence characteristics that improve measurement stability and accuracy in varying thermal conditions.
2Power
If the concentration of paramagnetic dopant is increased to improve signal strength, then NMR signal intensity increases, but temperature-dependent frequency shifts are exacerbated
Solution Approach 1:
The patent optimizes the dopant concentration to a specific range that balances signal strength and temperature stability. By precisely controlling the dopant concentration parameter, the probe achieves sufficient NMR signal intensity for accurate detection while the temperature dependence of the resonance frequency is simultaneously compensated, preventing excessive frequency shifts.
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 reduces temperature-dependent frequency shifts by more than an order of magnitude compared to conventional probes, enhancing the stability and accuracy of magnetic field monitoring, allowing for precise and reliable field measurements.
Implementation Method 1
a detector liquid that exhibits a nuclear magnetic resonance (NMR) line characterized by a chemical shift δ
Implementation Method 2
the detector liquid containing paramagnetic dopant means dissolved therein
Data Source
AI summary
A magnetic field probe, particularly for magnetic resonance applications, comprises: —a detector liquid that exhibits a nuclear magnetic resonance (NMR) line characterized by a chemical shift δ; —an electrically conductive structure surrounding the detector liquid for receiving therefrom a magnetic resonance signal; and —a container containing the detector liquid; —the detector liquid containing paramagnetic dopant means dissolved therein; —said NMR transition having an observable resonance frequency ω when the field probe is placed in an external magnetic field; and has orientation means for orienting the field probe in relation to a reference direction of said external magnetic field. The concentration cD of said paramagnetic dopant means is selected in such manner that, when the field probe is placed into an external magnetic field B0 and oriented in a predefined manner with respect to said external magnetic field at a given temperature T0, a temperature dependence ω′(T0) of said resonance frequency is substantially zero.