Inductive Conductivity Sensor Error Detection via Multi-Frequency Calibration
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Solution Overview
Problem
Inductive conductivity sensors often fail to recognize errors during operation, leading to potential inaccuracies in conductivity measurements, especially when using calibration models valid for different signal frequencies.
Innovation Solution
The method involves generating multiple transmitter signals with varying frequencies, determining conductivities using specific calibration models for each frequency, calculating conductivity differences, and signaling errors when these differences exceed predetermined thresholds, with the option to deactivate the sensor to prevent further measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single calibration model for a specific signal frequency is used, then the conductivity measurement is accurate at that frequency, but the sensor cannot detect errors when operating conditions change or when using different frequencies
Solution Approach 1:
The patent applies preliminary action by implementing multiple calibration models for different signal frequencies before actual measurement operations. The control unit stores several calibration models corresponding to different frequencies, and the system selects the appropriate model based on the operating frequency. This preparatory setup enables the sensor to accurately measure conductivity across varying frequencies and detect errors when measurements deviate from expected values, thus resolving the contradiction between measurement precision at a specific frequency and overall reliability across different conditions.
2Reliability
If multiple transmitter signals with varying frequencies are used, then error detection capability is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the control unit to handle multiple frequencies and calibration models through a single integrated system. The control unit universally manages signal generation, selects appropriate calibration models based on frequency, performs conductivity calculations, and detects errors across all operating conditions. This multi-functional approach enables error detection capability while avoiding the need for separate dedicated systems for each frequency, thus resolving the contradiction between reliability and device complexity.
3Reliability
If real-time error recognition is implemented, then measurement reliability is improved, but the processing time and computational load increase
Solution Approach 1:
The patent applies feedback by implementing a real-time monitoring mechanism where the control unit continuously compares measured conductivity values against expected ranges derived from multiple calibration models. When a measurement deviates from the expected range, the system immediately identifies it as an error. This feedback loop enables real-time error recognition without requiring extensive post-processing or complex computations, thus resolving the contradiction between measurement reliability and processing time.
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 real-time error recognition and signaling during operation, improving the accuracy and reliability of conductivity measurements by differentiating between actual and erroneous conductivity values.
Implementation Method 1
The electric transmitter signal is transmitted to the medium by the transmitter coil and the medium conveys the transmitter signal to the receiver coil. In the receiver coil, the transmitter signal conveyed by the medium induces a receiver signal
Implementation Method 2
the transmitter coil and the receiver coil are inductively coupled to one another by an electrically conductive medium
Data Source
AI summary
A method for operating an inductive conductivity sensor, wherein a first electric transmitter signal having a first signal frequency is generated and supplied to the transmitter coil, a first electric receiver signal is measured at the receiver coil and a first conductivity of the medium determined from the first electric receiver and first electric transmitter signals using a first calibration model. At least one further electric transmitter signal having a different signal frequency is generated and supplied to the transmitter coil, a further electric receiver signal is measured at the receiver coil and a further conductivity of the medium determined from the further electric receiver and electric transmitter signals using another calibration model, at least one conductivity difference is determined between each of the determined conductivities of the medium and when the at least one conductivity difference exceeds a threshold conductivity difference, the conductivity difference is signaled as an error.