Electrochemical Test Strip AC Impedance Angle Sample Recognition
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Solution Overview
Problem
Existing electrochemical test systems require manual operation to distinguish between quality control liquid and real samples, leading to potential misoperations and inaccurate results, necessitating an automated method to enhance reliability and accuracy.
Innovation Solution
Applying an AC voltage signal to the electrode surface of an electrochemical test strip to measure the AC impedance angle value, which is used to automatically differentiate between quality control liquid and real samples by comparing the measured value against predetermined thresholds specific to the type of test strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual quality control measurement mode is used, then the operator can perform quality control measurements, but the risk of misoperation increases and measurement accuracy decreases
Solution Approach 1:
The system automatically detects and identifies whether the sample is quality control liquid or real sample by measuring electrical characteristics (impedance, conductance, or capacitance) of the sample itself, without requiring operator intervention or manual mode selection. The sample performs the identification function autonomously through its inherent electrical properties.
Solution Approach 2:
The manual mechanical operation of mode switching is replaced by an automated electrical measurement system that detects sample type through electrical characteristics. The controller automatically distinguishes between quality control liquid and real sample using electrical signals, eliminating the need for manual mode selection.
2Measurement precision
If automated sample type recognition is implemented, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The existing electrical measurement components of the electrochemical test system are used for dual purposes: both for quality control/real sample measurement and for automatic sample type recognition. The same electrodes and measurement circuits that perform analytical measurements also detect sample type through impedance, conductance, or capacitance measurements.
Solution Approach 2:
The system utilizes different electrical parameters (impedance, conductance, or capacitance) to distinguish between sample types. By measuring these electrical characteristics and comparing them against predetermined thresholds, the system accurately identifies whether the sample is quality control liquid or real sample without adding complex hardware.
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 method simplifies the quality control process, reduces the risk of misoperation, and improves the accuracy and reliability of measurement results by accurately distinguishing between quality control liquid and real samples, such as blood, in electrochemical test systems.
Implementation Method 1
measuring the AC impedance angle value (i.e. phase difference between phase voltage and phase current in AC circuit) between work electrode and reference electrode after drawing test sample into the fluid chamber of electrochemical test strip
Data Source
AI summary
The present invention relates to the technical field of electrochemical detection, in particularly to a method for distinguishing between quality control liquid and real sample in an electrochemical test system with recognition device controller and recognition system. The method includes: (1) applying an AC voltage signal to the electrode surface(s) of an electrochemical test strip, (2) measuring the AC impedance angle (phase angle) value between working electrode and reference electrode after drawing a test sample into the fluid chamber of an electrochemical test strip, (3) automatically judging the test sample as quality control liquid or real sample according to the AC impedance angle value. The method provided by the invention can automatically distinguish between quality control liquid and real sample in an electrochemical test system, simplifying the operation steps of quality control, avoiding the misoperation under manual quality control mode, and improving the accuracy and reliability of measurement results.