Ionic Probe Dual Reference Electrode Self-Calibration
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Solution Overview
Problem
Existing pH measurement probes face inaccuracies due to temperature variations and contamination of electrolyte solutions, particularly because of unreliable reference signals from single reference electrodes, which require frequent maintenance and calibration.
Innovation Solution
The ionic probe employs two reference electrodes generating distinct reference signals, allowing for self-correction and self-calibration by comparing these signals with the measurement signal to determine the ionic measurement of an external fluid, thereby reducing the need for frequent maintenance and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single reference electrode is used in a pH probe, then the device complexity is reduced, but the measurement precision and reliability deteriorate due to inaccurate reference signals
Solution Approach 1:
The reference electrode system is segmented into multiple independent reference electrodes (at least two) that generate separate reference signals. Each reference electrode operates independently, allowing the system to compare multiple reference signals against the measurement signal, thereby improving measurement precision through redundancy and error detection.
2Measurement precision
If frequent calibration and maintenance are performed to ensure accurate reference signals, then the measurement precision is maintained, but the productivity and operational efficiency decrease
Solution Approach 1:
The system performs self-calibration and self-diagnosis by comparing multiple reference signals against each other and against the measurement signal. The microprocessor automatically detects drift or contamination in reference signals and adjusts measurements accordingly, eliminating the need for frequent manual calibration and maintenance while maintaining measurement precision.
Solution Approach 2:
The system continuously monitors reference signals from multiple reference electrodes and uses feedback mechanisms to detect changes or drift in reference potentials. This real-time monitoring allows the system to compensate for reference signal inaccuracies automatically, maintaining measurement accuracy without requiring frequent external calibration.
3Reliability
If multiple reference electrodes are implemented to improve measurement accuracy, then the reliability of pH measurements increases, but the device complexity and manufacturing costs increase
Solution Approach 1:
Multiple reference electrodes are combined within a single integrated probe housing, sharing common structural elements such as the electrolyte solution reservoir, housing, and electronic processing circuitry. This merging approach reduces overall device complexity compared to using separate probes, while still providing multiple reference signals for improved reliability.
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 enhances the accuracy and reliability of pH measurements by using dual reference electrodes for self-correction, reducing maintenance needs and operational costs, and providing a more stable and consistent measurement process.
Implementation Method 1
the hydrated layer of glass on the exterior of the ion sensitive bulb exchanges hydrogen ions with the fluid to be tested
Implementation Method 2
The internal electrolyte interacts with the ion sensitive glass and reflects a voltage potential developed in the hydrated layer of the glass
Implementation Method 3
The reference buffer solution is in ionic communication with the external fluid being tested. A potential difference (i.e., voltage) between the active and reference glass electrodes is thereby formed
Data Source
AI summary
An ionic probe is provided according to the invention. The ionic probe includes an active electrode configured to generate a measurement signal for an external test fluid, a first reference electrode configured to generate a first reference signal, and an at least second reference electrode configured to generate at least a second reference signal. The measurement signal is compared to the first reference signal and the at least second reference signal in order to determine an ionic measurement of the external test fluid.