Magneto-Inductive Flow Meter Interference Detection via Signal Segmentation
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Solution Overview
Problem
Existing magneto-inductive flowmeters face challenges in accurately measuring flow rates due to interference influences, which affect measurement accuracy and robustness, while also seeking cost-effective solutions.
Innovation Solution
The method involves using a magneto-inductive flowmeter with a magnet coil to induce a magnetic field in a pipe, exciting it with a square-wave signal to capture a measurement signal, and employing quadrature demodulation and low-pass filtration to recognize interference by forming mean values and differences between signal sub-portions, allowing for precise flow rate measurement despite interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional flow measurement methods are used, then the flow rate can be measured, but measurement accuracy deteriorates due to interference influences
Solution Approach 1:
The measurement signal is divided into multiple sub-portions (first sub-portion, second sub-portion, etc.) within each measurement value portion. By segmenting the signal and evaluating sub-portions separately, the method can identify and compensate for periodic interference patterns that affect different sub-portions differently, thereby improving measurement accuracy in the presence of interference.
Solution Approach 2:
The method employs a feedback mechanism where the difference between mean values of different sub-portions is calculated and used to detect interference. When interference is detected (when the difference exceeds a threshold), the system adapts by adjusting the evaluation process, creating a closed-loop system that continuously monitors and corrects for interference effects.
2Measurement precision
If complex interference compensation methods are applied, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
Instead of processing the entire measurement signal uniformly, the method applies partial action by selectively evaluating only certain sub-portions of the signal and comparing their mean values. This partial evaluation approach provides sufficient interference detection capability without requiring complex processing of the complete signal, thus balancing accuracy improvement with manageable device complexity.
Solution Approach 2:
The method creates a simplified model of the interference by comparing mean values from different sub-portions. Rather than implementing complex interference cancellation algorithms, it uses a copied and simplified evaluation approach where multiple sub-portions are processed through the same mean value calculation, and their differences reveal interference presence. This copying strategy reduces computational complexity while maintaining effectiveness.
3Reliability
If multiple sub-portions are evaluated separately, then interference detection improves, but computational effort increases
Solution Approach 1:
The method performs partial evaluation by calculating mean values only for selected sub-portions of the measurement signal rather than processing the entire signal in detail. This partial action approach provides sufficient interference detection capability while significantly reducing the computational effort compared to comprehensive signal analysis methods.
Solution Approach 2:
The evaluation process operates periodically by dividing the measurement signal into regular sub-portions and systematically comparing their mean values. This periodic structure allows the system to detect interference patterns efficiently through repeated, simple comparisons rather than continuous complex computation, reducing overall computational effort while maintaining reliable interference recognition.
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 approach enables reliable and precise measurement of flow rates with reduced computational effort, adaptability to interference, and enhanced robustness, while being cost-effective and suitable for various applications.
Implementation Method 1
a magnet coil (12) via which a magnetic field (13) can be induced in the cross-section of the pipe (11), where the field enters into interaction with charged particles flowing in the pipe (11). In this way, an electric voltage (17) can be elicited in the cross-section of the pipe (11) perpendicularly in the magnetic field (13)
Data Source
AI summary
A method for measuring a flow in a pipe via a magneto-inductive flowmeter, wherein a magnet coil of the magneto-inductive flowmeter is excited with a square-wave signal at a pulse frequency and a measurement signal is detected, a first measured value portion of the measurement signal, which comprises a first and a second sub-portion, is measured, a respective average value of the measurement signal is determined in the first and second sub-portions, and interference in the measurement signal is detected based on the respective average value if the average values differ from one another by at least one adjustable interference threshold value, where the invention also relates to a magneto-inductive flowmeter having a control unit configured to use a computer program product, a computer program product formed as a digital twin and configured to simulate the operating response of a flowmeter.