Electrochemical Concentration Measurement Using Pulse Current Normalization
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Solution Overview
Problem
Existing batch methods for measuring the concentration of a substance using electrochemical reactions face challenges in achieving high accuracy due to complex concentration distributions and electrolysis effects, leading to variations in measurement parameters.
Innovation Solution
A measurement device and method that apply specific voltage patterns over controlled time periods to minimize the impact of electrolysis and diffusion effects, using a first and second voltage application followed by a recovery period to normalize the electric current measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a batch method is employed where detection fluid droplets are dripped onto an electrode, then ease of operation is improved, but measurement precision deteriorates due to complex concentration distributions and electrolysis effects
Solution Approach 1:
The patent applies periodic voltage pulses to the electrode instead of continuous voltage. The measurement voltage is applied intermittently with rest periods, creating a periodic action that allows the system to return to equilibrium between measurements. This periodic approach reduces cumulative electrolysis effects and concentration distribution changes while maintaining the simple batch method operation.
Solution Approach 2:
The patent changes the temporal parameters of voltage application by introducing pulse width, amplitude, and interval variations. By optimizing these parameters, the system achieves accurate measurements while minimizing electrolysis impact. The parameter changes allow the measurement to be completed before significant concentration distribution changes occur.
2Adaptability or versatility
If multiple substances react in the droplet, then the complexity of the chemical system increases, but measurement precision deteriorates due to non-uniform substance movement and complex concentration distributions
Solution Approach 1:
The patent applies a preliminary voltage pulse before the main measurement to establish a stable baseline and initiate uniform reaction conditions. This preliminary action ensures that concentration distributions are minimized before the actual measurement begins, improving precision even when multiple substances are reacting simultaneously.
Solution Approach 2:
The patent uses short-duration voltage pulses that complete the measurement process quickly, rushing through the measurement before significant concentration distribution changes or non-uniform substance movement can occur. This approach captures the electrochemical signal before secondary effects interfere with measurement accuracy.
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 of concentration measurements by reducing the influence of parameter fluctuations, allowing for precise quantification of the analyte concentration.
Implementation Method 1
measuring an electric current that occurs due to electrolysis of the measurement substance
Implementation Method 2
due to diffusion of the measurement substance, to an extent not impacting on the measurement accuracy
Data Source
AI summary
A measurement device measures changes over time of a concentration of a measurement substance that occurs due to a reaction occurring as a result of a solution containing the analyte being dripped onto an electrode, by measuring an electric current that occurs due to electrolysis of the measurement substance. The measurement device applies a first voltage over a first application time period. The measurement device measures a first electric current flowing due to an application of the first voltage. The measurement device applies a second voltage over a second application time period. The measurement device a second electric current flowing due to an application of the second voltage. The measurement device uses the first electric current to normalize the second electric current and measures a concentration of the measurement substance that has changed based on the reaction or a concentration of the analyte that has changed based on the reaction.