Liquid Sensor Frequency Sweep Impedance Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing oil condition determination systems can detect changes in the oxidation condition of oil but fail to detect a parameter correlating with the degradation level of the oil.
Innovation Solution
A liquid sensor comprising a pair of electrodes and a control unit that sweeps the frequency of an AC voltage applied between the electrodes, detects impedance, and calculates a second parameter related to the impedance. This second parameter is used to detect a third parameter correlating with the degradation level of the oil, based on stored relationship information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance value of oil is measured to determine oxidation condition, then oxidation condition can be detected, but degradation level parameter cannot be detected
Solution Approach 1:
The patent changes the measurement parameter from simple resistance value to impedance across multiple frequencies. By sweeping through a range of frequencies and analyzing the impedance characteristics, the system extracts additional information about the liquid's degradation level that cannot be obtained from resistance alone. This parameter transformation enables detection of both oxidation condition and degradation level.
Solution Approach 2:
The patent adds the frequency dimension to the measurement. Instead of measuring resistance at a single point, the system measures impedance across multiple frequency points, creating a spectral profile. This dimensional expansion provides additional degrees of freedom for extracting multiple parameters (oxidation condition and degradation level) from the measurement data.
2Measurement precision
If impedance is measured at multiple frequencies to detect degradation level, then degradation parameter can be detected, but measurement complexity increases
Solution Approach 1:
The patent makes the impedance measurement system multi-functional by using the same frequency-sweeping apparatus to detect both oxidation condition and degradation level. The single measurement process serves multiple detection purposes, eliminating the need for separate measurement systems and reducing overall device complexity despite the increased measurement procedure.
Solution Approach 2:
The system uses the measured impedance data across frequencies to calculate a second parameter, which then serves as feedback to determine the degradation level. This feedback mechanism allows the system to extract meaningful degradation information from the complex impedance measurements, simplifying the interpretation of the multi-frequency data.
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 liquid sensor effectively detects the degradation level parameter of the oil with high precision, allowing for more accurate determination of when to replace the oil.
Implementation Method 1
the control unit detects an impedance of the liquid for each frequency
Implementation Method 2
a temperature sensor configured to detect a temperature of the liquid
Data Source
AI summary
A liquid sensor and a detection method detect a parameter correlating with a degradation level of a liquid. The liquid sensor includes a pair of electrodes immersed in the liquid and a control unit. The control unit sweeps a frequency of an AC voltage applied between the pair of electrodes and detects an impedance of the liquid for each frequency and calculates a second parameter relating to a first parameter correlating with the impedance or the impedance itself. The second parameter is a difference between a first degree of change and a second degree of change. The first degree of change and the second degree of change each indicates an amount of change in the first parameter relative to an amount of change in the frequency. The control unit further detects a third parameter correlating with a degradation level of the liquid based on the second parameter.