Permanent-Magnet NMR Layout for High-Temperature Fluid Measurement
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Solution Overview
Problem
Existing NMR devices are limited to analyzing fluids with temperatures not exceeding 55°C due to sensitivity to temperature by permanent magnets, necessitating a solution for accurate measurement at higher temperatures.
Innovation Solution
An NMR device is designed with a thermally isolated permanent magnet using a second fluid conduit made of thermally insulating material to control the temperature of the magnet, maintaining it below a defined limit by adjusting the temperature of the second fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a permanent magnet is used in an NMR device, then the device can operate at room temperature without complex cooling systems, but the permanent magnet becomes extremely sensitive to temperature and is limited to analyzing fluids with temperatures not exceeding 55°C
Solution Approach 1:
The device is divided into two separate fluid conduits: a first fluid conduit for conveying the sample fluid to be analyzed, and a second fluid conduit for conveying a temperature control fluid. This segmentation allows independent temperature management of the magnet from the sample, enabling the magnet to be protected from high temperatures while the sample can be at any temperature.
Solution Approach 2:
A second fluid acts as an intermediary between the high-temperature sample and the temperature-sensitive permanent magnet. The second fluid conduit, made of thermally insulating material, carries this intermediary fluid that absorbs excess heat from the sample side, preventing direct thermal transfer to the magnet and maintaining it within safe operating temperatures.
2Adaptability or versatility
If the permanent magnet is directly exposed to high temperature fluids, then the NMR device can measure high temperature fluids, but the measurement precision and reliability deteriorate due to temperature sensitivity of the permanent magnet
Solution Approach 1:
The fluid transport system is segmented into two independent conduits: the first fluid conduit for sample transport and the second fluid conduit for thermal management. This allows the sample to be at high temperatures for versatile measurement while the magnet remains in a controlled temperature zone for precise operation.
Solution Approach 2:
The second fluid serves as a thermal intermediary that decouples the temperature of the sample from the magnet. By adjusting the temperature of the second fluid, the system maintains optimal magnet temperature regardless of sample temperature, preserving measurement precision across a wide temperature range.
3Reliability
If thermally insulating material is used for the second fluid conduit, then the permanent magnet is protected from high temperatures, but the device complexity increases
Solution Approach 1:
The second fluid conduit serves multiple functions simultaneously: it conveys temperature control fluid, provides thermal insulation through its material composition, and acts as a structural support element. This multi-functionality reduces overall device complexity despite the addition of the conduit, as it consolidates several protective and control functions into a single component.
Solution Approach 2:
The thermally insulating material in the second fluid conduit provides passive thermal protection without requiring active control mechanisms. The insulation property inherently prevents heat transfer from the sample side to the magnet, allowing the system to self-regulate temperature protection without complex control systems.
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 accurate NMR measurements of fluids exceeding 55°C by thermally isolating the permanent magnet, ensuring measurement precision and reliability at elevated temperatures.
Implementation Method 1
a second fluid conduit (30) that is configured to convey a second fluid, the second fluid conduit (30) surrounds the first fluid conduit (20) and is made of a thermally insulating material
Implementation Method 2
the second fluid conduit (30) surrounds the first fluid conduit (20) and is made of a thermally insulating material
Data Source
AI summary
An NMR device that includes (i) a first fluid conduit that includes a measurement region and is configured to convey fluid, (ii) an NMR measurement unit that is configured to perform an NMR measurement of the fluid within the measurement region; wherein the NMR measurement unit comprises a permanent magnet; and (iii) a temperature control unit that is configured to thermally shield the permanent magnet, during the NMR measurement, from a temperature of the fluid within measurement region.