Dynamic Sensor System for Reliable Liquid Transition Detection
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Summary
Problems
Existing sensor systems for liquid quality measurement, such as those used in milking, often fail to accurately detect changes in liquid properties, leading to false-positive alarm signals due to gradual changes in parameter values, which can result in undesirable consequences like incorrect liquid supply or machine damage.
Innovation solutions
A sensor system with a through-flow cell, detector device, and sensor control that analyzes detector signals to detect liquid transitions by considering the degree and velocity of changes in signal values, generating an alarm signal when a change exceeds a predetermined threshold, and includes features like liquid presence detection, optical property measurement, and temperature monitoring to prevent false alarms.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a sensor system compares parameter values to absolute threshold values for liquid quality measurement, then the system can detect liquid transitions, but gradual changes in parameter values with the same liquid cause false-positive alarm signals
Why choose this principle:
The patent implements dynamic threshold adjustment by continuously adapting the reference threshold based on the running mean of detected parameter values. Instead of using fixed absolute thresholds, the system dynamically calculates thresholds that adapt to gradual changes in liquid properties, thereby distinguishing between normal parameter drift and actual liquid transitions. This dynamic approach resolves the contradiction by maintaining measurement precision while improving detection reliability.
Principle concept:
If a sensor system compares parameter values to absolute threshold values for liquid quality measurement, then the system can detect liquid transitions, but gradual changes in parameter values with the same liquid cause false-positive alarm signals
Why choose this principle:
The patent changes the measurement approach from comparing against fixed absolute values to comparing against dynamically adjusted thresholds based on the statistical properties (running mean and standard deviation) of the parameter values. This parameter change in the threshold calculation method allows the system to accommodate gradual parameter changes while still detecting significant liquid transitions accurately.
Application Domain
Data Source
AI summary:
A sensor system with a through-flow cell, detector device, and sensor control that analyzes detector signals to detect liquid transitions by considering the degree and velocity of changes in signal values, generating an alarm signal when a change exceeds a predetermined threshold, and includes features like liquid presence detection, optical property measurement, and temperature monitoring to prevent false alarms.
Abstract
Sensor system with a sensor device having a through-flow cell for liquid, a detector device for measuring a property of the liquid in the through-flow cell and for generating an associated detector signal, a sensor control for analyzing the detector signal, wherein the sensor control detects a liquid transition between two different liquids in the through-flow cell when a change (per unit time) in the detector signal is greater is than a threshold value. In the case of such a liquid transition detection, the sensor control generates an alarm signal. Liquid transition detection is carried out by optical, temperature and/or conductivity sensors.