Vibronic Sensor Fill-Level Detection with Frequency-Amplitude Analysis
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Solution Overview
Problem
Existing vibronic sensors struggle to accurately determine and monitor fill levels in containers due to interference from factors like foam and sediment, which conventional methods fail to distinguish effectively.
Innovation Solution
A method that considers both amplitude and frequency of the reception signal, using reference values to differentiate between different causes of changes, allowing for precise detection of fill levels and identifying the presence of foam or sediment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-parameter (frequency or amplitude) measurement methods are used, then the device complexity is low, but the measurement precision deteriorates due to inability to distinguish between foam and sediment interference
Solution Approach 1:
The patent transitions from single-parameter measurement to two-dimensional measurement by simultaneously evaluating both frequency and amplitude of the vibration signal. This dimensional expansion enables differentiation between foam and sediment interference patterns, resolving the measurement precision issue without requiring additional hardware sensors.
Solution Approach 2:
The patent monitors changes in vibration characteristics (frequency and amplitude) caused by different media conditions. By analyzing how these parameters change under different conditions (foam vs. sediment presence), the system achieves accurate fill level detection despite the complexity of the evaluation process.
2Reliability
If the mechanically vibratable unit is covered by foam or sediment, then the measurement of fill level becomes unreliable, but adding complex filtering or multiple sensors increases device complexity
Solution Approach 1:
The patent converts the harmful effect of foam and sediment coverage into a useful diagnostic tool. By analyzing the specific patterns of frequency and amplitude changes caused by these materials, the system not only maintains measurement reliability but also identifies the presence of interfering substances, turning a problem into a feature.
Solution Approach 2:
The system uses feedback from the vibration signal characteristics to adjust and refine fill level measurements. By continuously monitoring frequency and amplitude changes and comparing them against expected patterns, the system maintains reliable measurements even when foam or sediment is present on the vibratable unit.
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 determination and monitoring of fill levels by distinguishing between foam and sediment, enhancing the reliability and precision of vibronic sensors in various applications.
Implementation Method 1
The drive/receiving unit excites the mechanically vibratable unit to induce mechanical vibrations by means of an electrical excitation signal
Implementation Method 2
the drive/receiving unit can receive the mechanical vibrations of the mechanically vibratable unit and convert same into an electrical reception signal
Implementation Method 3
the resonant circuit condition according to which the amplification factor is ≥1 and all phases occurring in the resonant circuit result in a multiple of 360° must be fulfilled for a resonant vibration
Data Source
AI summary
A method for determining and/or monitoring a predeterminable fill level of a medium in a container using a vibronic sensor having at least one sensor unit with a mechanically vibratable unit, comprises exciting the mechanically vibratable unit with an excitation signal to produce mechanical vibrations, and receiving the mechanical vibrations in the form of a reception signal, determining an amplitude and a frequency of the reception signal, comparing the frequency and amplitude of the reception signal with a predeterminable frequency limit value and a predeterminable amplitude limit value, and determining a reaching of the predeterminable fill level on the basis of the comparison.