Fill Level Sensor Signal Segmentation for Interference Rejection
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Solution Overview
Problem
Existing methods for determining the fill level of media in containers face challenges with interference signals, particularly in media with low dielectric constants and low electrical conductivity, leading to complex and selective signal evaluation processes.
Innovation Solution
The method involves filtering and processing received signals into sub-signals based on properties such as frequency, polarization, and solid angle, allowing for the separation and evaluation of actual echo signals from interference signals, using techniques like Fourier transformations and classification into signal classes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If selective and complex methods for signal evaluation are used to handle interference signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The received signal is divided into multiple sub-signals based on different propagation times. Each sub-signal corresponds to a specific time window and can be evaluated independently. This segmentation allows the system to identify and process the useful echo signal separately from interference signals, improving measurement precision while maintaining manageable complexity through systematic division of the evaluation process.
2Adaptability or versatility
If general and flexible handling of interference signals is implemented, then adaptability is improved, but processing time increases
Solution Approach 1:
The signal evaluation process is prepared in advance by defining multiple time windows for sub-signal generation before the actual measurement is needed. The propagation time ranges for different sub-signals are predetermined, allowing the system to quickly switch between different evaluation modes without performing complex real-time analysis. This preliminary preparation enables flexible adaptation to different measurement scenarios while keeping processing time minimal during actual operation.
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 flexible and general handling of interference signals, improving the accuracy and reliability of fill level determination by extracting specific information from sub-signals, even in complex surface structures and three-dimensional measurements.
Implementation Method 1
at least one transmission unit (4) for emitting at least one - in particular electromagnetic - transmission signal
Implementation Method 2
at least one reception unit (5) for receiving at least one - in particular electromagnetic - reception signal
Implementation Method 3
The running time method implemented by the measuring devices is based on the physical law that the running distance z. B. an electromagnetic signal is equal to the product of transit time and propagation speed
Data Source
Figure 1~2
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AI summary
The method involves transmitting the transmission signal and receiving the return signal. The return signal and signal derived from the return signal are evaluated using adjustable evaluation criteria to determine the fill level of medium (1) in container (3). The return signal and signal derived from the return signal are filtered. The transmission signal with adjustable transmission signal characteristics is transmitted and return signal with adjustable receiving characteristics is received. An independent claim is included for a device for determining fill level of medium.