Liquid Conductivity Sensing Using Delayed Voltage Acquisition
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Solution Overview
Problem
Existing liquid state detection sensors face instability in inter-electrode voltage values immediately after voltage application, leading to inaccurate electrical conductivity measurements.
Innovation Solution
A liquid state detection sensor that includes a voltage value acquisition time period setting unit, a voltage value acquisition unit, and an electrical conductivity calculation unit, which acquires and calculates electrical conductivity based on stabilized inter-electrode voltage values after a predetermined time period to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC voltage is applied between two electrodes to measure inter-electrode voltage value, then electrical conductivity and dielectric constant can be obtained, but the inter-electrode voltage value becomes unstable immediately after voltage application, deteriorating measurement accuracy
Solution Approach 1:
The system applies voltage to the electrodes before performing the measurement, allowing the inter-electrode voltage value to stabilize. The control unit is configured to measure the inter-electrode voltage value only after a predetermined time period has elapsed since voltage application, ensuring that the measurement is taken when the value has stabilized and is most accurate.
2Loss of time
If inter-electrode voltage value is acquired immediately after voltage application, then measurement time is reduced, but accuracy is deteriorated due to voltage instability
Solution Approach 1:
The system applies voltage to the electrodes before performing the measurement, allowing the inter-electrode voltage value to stabilize. The control unit is configured to measure the inter-electrode voltage value only after a predetermined time period has elapsed since voltage application, ensuring that the measurement is taken when the value has stabilized and is most accurate.
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 sensor accurately detects liquid state by suppressing voltage value instability, enabling high-accuracy electrical conductivity measurements.
Implementation Method 1
an inter-electrode voltage value is measured by applying AC voltage between these two electrodes, thereby obtaining a dielectric constant and an electrical conductivity of the oil on the basis of thus-obtained inter-electrode voltage value
Data Source
AI summary
A liquid state detection sensor includes: an electrode part, the electrode part having a pair of electrodes provided so as to be opposed to each other; a voltage value acquisition time period setting unit configured to set a voltage value acquisition time period, the voltage value acquisition time period being a length of a time period during which an inter-electrode voltage value of the pair of electrodes of the electrode part is acquired; a voltage value acquisition unit configured to acquire the inter-electrode voltage value in the voltage value acquisition time period; and an electrical conductivity calculation unit configured to calculate an electrical conductivity of the liquid on the basis of, among the inter-electrode voltage value acquired by the voltage value acquisition unit, the inter-electrode voltage value acquired after a predetermined time period has elapsed since a start of the voltage value acquisition time period.