Adaptive Reference Curve for Interference Masking in Fill Level Measurement
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Solution Overview
Problem
Current methods for removing interference echo signals from travel-time measurement signals in fill level measurement devices fail to react to changes in process conditions and measurement performance, leading to inaccurate fill level assessments.
Innovation Solution
A method that generates an intermediate frequency signal from the total measurement signal, using sequential sampling, and creates a static reference curve to mask interference echo signals, which is adjusted based on changes in process and measurement conditions, utilizing a sliding minimum filter to maintain signal integrity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a static reference curve is used to mask interference echo signals, then interference signals can be effectively removed, but the measurement accuracy deteriorates when process conditions change
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a static reference curve to a dynamic reference curve that automatically adapts to changing process conditions. The system continuously monitors measurement characteristics and updates the reference curve accordingly, enabling effective interference masking while maintaining measurement accuracy under varying conditions such as different media densities, temperatures, or container configurations.
Solution Approach 2:
The patent implements feedback by establishing a closed-loop system where measurement results are continuously fed back to refine the reference curve. The system compares current measurement patterns against the reference curve and adjusts the reference parameters based on observed deviations, creating an adaptive mechanism that maintains optimal interference masking performance while preserving fill level measurement precision.
2Stability of the object's composition
If interference echo signals are removed using fixed correction methods, then measurement stability is improved, but adaptability to process changes deteriorates
Solution Approach 1:
The patent applies dynamics by replacing fixed correction methods with a dynamic reference curve that evolves with process conditions. The system continuously adapts the reference curve parameters based on real-time measurement characteristics, enabling stable interference removal while maintaining high adaptability to changing media properties, container configurations, or environmental conditions.
Solution Approach 2:
The patent implements parameter changes by modifying the reference curve parameters dynamically rather than using fixed values. The system adjusts reference parameters such as threshold values, time windows, and filtering characteristics based on detected process conditions, allowing the measurement system to maintain stability across varying operational scenarios while adapting to new conditions.
3Measurement precision
If complex signal processing is applied to remove interference signals, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies the copying principle by creating a simplified digital model (reference curve) of the interference signal pattern rather than using complex physical filtering systems. This virtual copy of the interference characteristics allows for effective signal removal through computational comparison and subtraction, achieving high measurement accuracy while keeping the physical device structure simple and the processing algorithm relatively straightforward.
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 allows for accurate and adaptive fill level measurement by effectively masking interference signals and maintaining the integrity of the wanted echo signals, even with changes in process conditions, thus optimizing the measurement process without increasing costs or introducing additional measurement errors.
Implementation Method 1
In travel-time measuring methods, by way of example, ultrasonic waves are transmitted from a sound transducer, or microwaves, respectively radar waves, are transmitted via an antenna or are guided on a waveguide protruding into the medium. These transmitted waves are reflected on the surface of the medium and received back, following a distance-dependent travel time of the signal
Implementation Method 2
These transmitted waves are reflected on the surface of the medium and received back, following a distance-dependent travel time of the signal
Implementation Method 3
a first travel-time measurement method is the time-difference measurement method, which ascertains the duration of the travel-time of a transmitted, high-frequency, pulse signal on a path over which it travels
Implementation Method 4
Another widely used ascertainment method involves determining the frequency difference of a continuously transmitted, high-frequency signal, whose transmission frequency is, for example, continuously changed with time, relative to the reflected, received, high-frequency signal (FMCW—Frequency Modulated Continuous Wave)
Data Source
AI summary
An improved and more accurate method for evaluating and correcting total measurement signals (TS(n)) of measuring devices. The invention concerns a method for evaluating and correcting total measurement signals (TS(n)) of a measuring device, wherein measuring signals are transmitted in the direction of a medium and reflected on a surface of the medium as wanted echo signals or on a surface of a disturbing element as interference signals and received. In the case of a modification of at least one technical, process condition in the container and/or a modification of at least one technical, measurement condition of the measuring device, an independent reference curve is ascertained on the basis of a current static reference curve, wherein the interference signals are masked out of the raw echo curve on the basis of a masking algorithm, which applies the independent reference curve.