Nuclear Magnetic Flowmeter Multi-Antenna Exposure Control
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Solution Overview
Problem
Nuclear magnetic flowmeters face reliability and maintenance issues due to complex mechanisms required to vary the effective exposure duration of the magnetic field, which increases costs and reduces reliability.
Innovation Solution
The use of multiple coil-like antennae with different measuring sections allows for varying exposure durations without a mechanical mechanism, simplifying construction, reducing maintenance efforts, and increasing reliability by enabling more precise measurement of magnetization at multiple exposure durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical mechanism is used to vary the effective exposure duration of the magnetic field, then the measurement capability at different exposure durations is improved, but the device complexity and maintenance requirements increase
Solution Approach 1:
The patent divides the single antenna system into multiple separate antennas (first antenna and second antenna), each with different measuring sections. This segmentation eliminates the need for mechanical mechanisms to vary exposure duration, as each antenna inherently provides measurements at different exposure durations simultaneously. The measuring sections are positioned at different locations along the flow direction, creating different effective exposure durations without requiring moving parts.
Solution Approach 2:
Multiple antennas serve dual functions: they independently measure magnetization at different exposure durations and collectively provide comprehensive flow measurement capability across a range of conditions. Each antenna functions as both an excitation source and a detection element, eliminating the need for separate mechanical adjustment mechanisms while achieving versatile measurement capability.
2Adaptability or versatility
If a mechanical mechanism is used to vary the effective exposure duration of the magnetic field, then the measurement capability is improved, but the reliability decreases due to more maintenance requirements
Solution Approach 1:
The patent replaces the mechanical adjustment mechanism with a static multi-antenna configuration. Instead of using moving parts to change the effective exposure duration, the system uses multiple fixed antennas with different measuring section positions. This substitution of mechanical systems with electromagnetic field-based solutions eliminates wear, friction, and mechanical failure modes, significantly improving reliability while maintaining the ability to measure at different exposure durations.
3Measurement precision
If multiple coil-like antennae with different measuring sections are used, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple antennas with different measuring sections into a single integrated antennae unit. While each antenna provides measurements at different exposure durations, they are electrically and functionally integrated through the common magnetic field generator and signal processing system. This merging approach achieves high measurement precision through multiple measurement points while presenting a unified, manageable device structure rather than separate independent 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
This design enhances measurement reliability and accuracy by eliminating the need for complex mechanisms, reducing costs, and allowing for more antennae to be implemented, thereby improving the measurement of magnetization across different exposure durations.
Implementation Method 1
a magnetic field generator (4), a measuring unit (5) and an antennae unit (6) with an antenna (7), wherein the magnetic field generator (4) permeates the flowing medium (3) with a magnetic field (B) having at least a component perpendicular to a longitudinal axis (8) of the measuring tube (2) over a magnetic field path (9) aligned parallel to the longitudinal axis (8) of the measuring tube (2) for magnetizing the medium (3)
Implementation Method 2
The vector of the magnetic moment of an atomic nucleus, in the presence of a macroscopic magnetic field, aligns itself parallel to the vector of the macroscopic magnetic field at the location of the atomic nucleus
Implementation Method 3
the measuring unit (5) is designed to generate excitation signals exciting the magnetized medium (3) and to measure the measuring signals caused by the excitation signals in the magnetized medium (3) and wherein the antenna (7) is designed as a coil and is designed for transmitting the excitation signals to the magnetized medium (3) and for detecting the measuring signal
Data Source
AI summary
A nuclear magnetic flowmeter (1) for determining the flow of a medium flowing through a measuring tube (2) having a magnetic field generator (4), a measuring unit (5) and an antennae unit (6) with an antenna (7). wherein the antennae unit (6) has at least one further antenna (11, 12), that is designed as a coil and is designed for transmitting the excitation signal to the magnetized medium (3) and for detecting the measuring signal over a further measuring section (13, 14) aligned parallel to the longitudinal axis (8) of the measuring tube and located in the magnetic field path (9), and the measuring section (10) and the further measuring section (13, 14) are different.