Adaptive Conductivity Sensor Filter for Interference
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Solution Overview
Problem
Conductivity sensors face challenges in achieving a balance between rapid response times and reliable measurement results due to fluctuations caused by component tolerances and interfering influences like EMC disturbances, which affect the accuracy of conductivity value determination.
Innovation Solution
A method using a conductivity sensor with a control unit that determines a signal quality indicator and dynamic factor to dynamically adjust the filter function, allowing for efficient reduction of strong fluctuations and quick response to interfering influences, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large filter depth is used to reduce the influence of brief interfering influences, then measurement reliability is improved, but response time becomes slow
Solution Approach 1:
The patent applies dynamics by making the filter depth adaptive rather than fixed. The control unit dynamically adjusts the filter depth based on the detected interference level in the measurement signal. When interference is detected, the filter depth increases to suppress noise; when interference is absent, the filter depth decreases to allow rapid response. This dynamic adjustment resolves the contradiction between reliability and response time.
Solution Approach 2:
The patent changes the parameter of filter depth based on signal quality assessment. The control unit evaluates the measurement signal for interfering influences and modifies the filtering parameters accordingly. This parameter change allows the system to optimize between noise suppression and response speed depending on actual measurement conditions.
2Speed
If a small filter depth is used to achieve rapid response time, then response speed is improved, but measurement reliability deteriorates due to stronger influence of brief interfering influences
Solution Approach 1:
The system dynamically adjusts filter depth based on real-time interference detection. When no interference is present, a small filter depth enables rapid response. When interference is detected, the filter depth increases to maintain reliability. This dynamic behavior resolves the contradiction between speed and reliability.
Solution Approach 2:
The control unit continuously monitors the measurement signal for interfering influences and uses this feedback to adjust the filter depth. This closed-loop feedback mechanism ensures that the filter depth is optimized for current conditions, maintaining reliability while enabling fast response when appropriate.
3Measurement precision
If strong filtering is applied to reduce fluctuations in conductivity signal, then measurement precision is improved, but response time increases
Solution Approach 1:
The filter depth is dynamically adjusted based on the presence of interfering influences. Strong filtering is applied only when interference is detected and precision is needed; otherwise, lighter filtering is used to maintain fast response. This dynamic approach resolves the contradiction between precision and response time.
Solution Approach 2:
The filtering parameters are changed adaptively based on signal quality assessment. The control unit modifies the filter depth parameter to balance precision and response time requirements according to actual measurement conditions, applying strong filtering only when necessary.
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
The method enables quick and qualitative response to unforeseen interfering influences, reducing strong fluctuations in conductivity signal measurements and providing improved measurement reliability.
Implementation Method 1
transmitting a stimulation signal into the measurement medium at the transmitting unit... a sinusoidal electrical AC voltage at the electrodes ensures a current flow through the medium
Implementation Method 2
the electrical resistance of a liquid medium is ascertained by measuring at least one electrical variable such as voltage and/or current
Data Source
AI summary
The present disclosure relates to a method for determining a conductivity value of a measurement medium using a conductivity sensor. The method includes providing a conductivity sensor with at least one transmitting unit, at least one receiving unit, and a control unit having a storage module, and transmitting a stimulation signal into the measurement medium at the transmitting unit by the control unit. The method also includes receiving a detection signal at the receiving unit, determining a signal quality indicator by the control unit based on the detection signal, and determining a conductivity signal corresponding to the detection signal. The method further includes storing the conductivity signal, determining a dynamic factor by the control unit based on the conductivity signal, filtering the conductivity signal using a filter function depending on the determined signal quality indicator and the dynamic factor, and outputting a filtered measured value of the filtered conductivity signal.