Oxygen Sensor Calibration Using Linear Fitting
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Solution Overview
Problem
The calibration process for oxygen sensors in medical ventilation systems is time-consuming due to the slow response of electrochemical oxygen cells, which requires waiting for the output voltage to stabilize at each oxygen concentration, increasing the workload and preparation time.
Innovation Solution
A calibration method that involves acquiring at least two electrical signals from the oxygen sensor at specific time points within a preset time period when the sensor is at a preset oxygen concentration, determining a response function representing the relationship between the electrical signal and time, and calculating the steady-state output value to establish a characteristic curve of the oxygen sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration method waiting for voltage stabilization is used, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by performing multiple voltage measurements at different time points (t1, t2, t3) before the voltage fully stabilizes, and using linear fitting to predict the steady-state voltage. This allows the calibration to proceed without waiting for complete voltage stabilization, reducing calibration time while maintaining measurement precision through mathematical prediction of the final stable value.
2Reliability
If high calibration frequency is implemented, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent replaces the mechanical waiting process (physically waiting for voltage stabilization) with a mathematical calculation system. By using linear fitting algorithms to predict steady-state voltage from time-series measurements, the system eliminates the need to wait for voltage stabilization, thereby reducing machine preparation time while maintaining monitoring accuracy through reliable mathematical prediction.
3Measurement precision
If traditional calibration process is used, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent applies preliminary action by collecting multiple voltage measurements at different time points during the response phase (before full stabilization) and using linear fitting to predict the steady-state voltage. This approach maintains the accuracy of the voltage-oxygen concentration proportional coefficient while significantly reducing calibration time, thereby improving calibration efficiency and productivity.
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 reduces the waiting time for the oxygen sensor to reach a stable state, improves calibration efficiency, and enhances the accuracy of oxygen concentration monitoring in medical ventilation systems.
Implementation Method 1
The principle of electrochemical oxygen cell is that the voltage value which is generated by the oxygen cell is proportional to the oxygen concentration under fixed pressure and temperature
Implementation Method 2
Common oxygen sensors include electrochemical oxygen cells and paramagnetic oxygen sensors
Data Source
AI summary
A calibration method for an oxygen sensor and a medical ventilation system are disclosed. At least two electrical signals are acquired at two time points within a preset time period, when the oxygen sensor is in a preset oxygen concentration. A response function of the oxygen sensor which corresponds to the preset oxygen concentration, is determined according to the at least two time points and the at least two electrical signals. A steady-state output value of the oxygen sensor in the preset oxygen concentration is determined, according to the response function and a characteristic curve of the oxygen sensor is determined, according to the steady-state output value of the oxygen sensor in the preset oxygen concentration. The described method reduces the time waiting for the oxygen sensor to respond, thus improving calibration efficiency, and facilitating the improvement of the oxygen concentration monitoring accuracy of a ventilation device in daily use.