Glass pH Sensor Response Rate Improvement via Feedback Capacitor
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Solution Overview
Problem
Conventional glass pH sensors have a long time constant, making them unsuitable for rapid pH measurements in applications like online identification and auto-titrators, and existing methods for diagnosing defects are inefficient due to instability and long response times.
Innovation Solution
A pH measurement system that reduces the time constant of the glass pH sensor by applying an external power source through a resistor and using a feedback capacitor, and diagnoses defects by calculating the equivalent internal resistance and supply voltage using a square wave voltage, with a feedback circuit implemented with an embedded CPU to adjust and stabilize the measurement process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an external power source is applied through a resistor to reduce the time constant, then the response rate is improved, but the measurement precision may deteriorate due to instability
Solution Approach 1:
The patent applies feedback by using a feedback capacitor connected between the output and input of the calculation amplifier. This feedback mechanism stabilizes the measurement process while allowing the external power source to reduce the time constant, thus resolving the contradiction between improved response rate and maintained measurement precision.
2Loss of time
If the time constant is reduced for faster measurement, then the measurement time is shortened, but the reliability of defect diagnosis deteriorates due to instability
Solution Approach 1:
The feedback capacitor provides stability during the reduced measurement time, ensuring that defect diagnosis remains reliable even though the measurement time is shortened by applying external power through a resistor.
Solution Approach 2:
The patent changes the electrical parameters by applying an external power source with controlled resistance, which modifies the time constant and enables faster measurement while maintaining diagnostic reliability through the feedback mechanism.
3Device complexity
If a conventional measurement system is used, then the device complexity is simple, but the productivity is reduced due to long measurement time
Solution Approach 1:
The feedback capacitor adds minimal complexity to the system while dramatically improving measurement speed and productivity by reducing the time constant through external power application.
Solution Approach 2:
By changing the electrical parameters through external power application, the system achieves faster measurement and higher productivity without requiring complex structural modifications.
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
The system achieves a faster response rate and reduced measurement time for pH measurements, enabling effective diagnosis of sensor defects and ensuring stability in dynamic applications, with the embedded CPU ensuring proper functioning and follow-up measures.
Implementation Method 1
measurement of the hydrogen ion concentration (pH) of a solution is very important
Implementation Method 2
can improve the response rate by reducing the time constant of the glass pH sensor using an external supply voltage applied through a resistor
Implementation Method 3
measures the output voltage of the glass pH sensor using a calculation amplifier that has an input resistance of 1012Ω or more
Implementation Method 4
The equivalent internal capacitance results from the electrical double layers of the electrode and the solution and is distributed across the body of the glass pH sensor
Data Source
AI summary
A pH measurement system using a glass pH sensor includes a power supply applying a voltage to the glass pH sensor through a resistor; a detector detecting the output voltage of the glass pH sensor; and a calculator calculating the pH of a solution based on the detected output voltage. The resistor provides a resistance of at least ten times less than the equivalent internal resistance of the glass pH sensor. The pH measurement system can improve the response rate by reducing the time constant depending on the dynamic characteristics of the glass pH sensor, and it is possible to diagnose whether the pH measurement system is defective or not by calculating the equivalent internal resistance and the supply voltage of the glass pH sensor.