Electrochemical Sensor Pseudo-Reference Electrode Drift Compensation
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Solution Overview
Problem
Traditional reference electrodes are large, expensive, and lack stability in varying solution conditions, making them unsuitable for compact and cost-effective measurement systems that require accurate parameter measurement across multiple parameters.
Innovation Solution
A pseudo-reference electrode system with a dependence electrode is used, where the pseudo-reference electrode's potential is compensated based on measurements from the dependence electrode, allowing for accurate parameter measurement by adjusting for dependencies such as chloride ion concentration, and optionally using a membrane to reduce ion diffusion and improve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional reference electrode is used, then measurement accuracy can be maintained, but the device becomes large, expensive, and unstable in varying solution conditions
Solution Approach 1:
The patent uses a pseudo-reference electrode that replicates the function of a traditional reference electrode but with simplified construction. Instead of using expensive, complex traditional reference electrodes (requiring salt bridges, gel-filled structures), the invention employs a simplified electrode design that achieves comparable reference potential stability through alternative materials and configurations, thereby reducing device size and cost while maintaining measurement accuracy
Solution Approach 2:
The patent compensates for the pseudo-reference electrode's potential drift by introducing a dependence electrode that measures changes in a specific parameter (such as ion concentration). The system then adjusts the reference potential dynamically based on measured parameter changes, allowing the simplified electrode to achieve stability equivalent to traditional electrodes through active parameter compensation rather than passive structural complexity
2Device complexity
If a pseudo-reference electrode is used, then device size and cost are reduced, but potential stability deteriorates due to dependence on solution properties
Solution Approach 1:
The patent implements a feedback mechanism where the dependence electrode continuously monitors solution property changes (such as ion concentration) and feeds this information back to the measurement system. The system then dynamically adjusts the reference potential compensation based on this feedback, creating a closed-loop system that maintains potential stability despite the simplified electrode construction and varying solution conditions
Solution Approach 2:
The dependence electrode acts as an intermediary that indirectly measures the effect of solution property changes on the pseudo-reference electrode potential. Instead of directly stabilizing the pseudo-reference electrode potential, the system uses the dependence electrode to detect parameter changes and applies compensatory adjustments, effectively mediating between the unstable reference potential and the measurement system to achieve stable readings
3Measurement precision
If compensation for reference potential dependence is implemented, then measurement accuracy improves, but system complexity increases
Solution Approach 1:
The dependence electrode serves multiple functions: it acts as a reference electrode, a sensor for measuring solution properties (such as ion concentration), and a compensation mechanism for potential drift. By making this single component multi-functional, the patent reduces the need for separate compensation circuits and sensors, thereby limiting the increase in system complexity while achieving improved measurement accuracy through comprehensive parameter compensation
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 the creation of compact, cost-effective measurement systems with improved accuracy and stability, capable of measuring multiple parameters simultaneously by compensating for potential drift and ion dependencies, suitable for applications like biosensing and industrial monitoring.
Implementation Method 1
An electrochemical sensor may convert information associated with electrochemical reactions (e.g., the reaction between an electrode and an analyte) into an applicable qualitative or quantitative signal
Implementation Method 2
a dependence electrode configured to generate a dependence potential when exposed to a sample, wherein both the reference potential and the dependence potential vary based on a property of the sample
Implementation Method 3
a membrane formed over the pseudo-reference electrode
Data Source
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Figure 3A
AI summary
Electrochemical sensor comprising a reference electrode and measuring method. In one aspect, a measurement system includes a pseudo-reference electrode configured to provide a reference potential and a dependence electrode configured to generate a dependence potential when exposed to a sample. Both the reference potential and the dependence potential vary based on a property of the sample. The electrochemical sensor includes the pseudo-reference electrode and the dependence electrode.