Powder Handling Sensor Phase Detection for False Alarm Reduction
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Solution Overview
Problem
Conventional sensor systems for monitoring powder handling devices suffer from low Signal to Noise Ratio (SNR), leading to false alarms and compromised safety due to filtering out potential contamination incidents, which are often triggered by brief contacts between rotor and housing, thus risking product contamination.
Innovation Solution
A sensor system that determines the phase difference between input and output signals to provide higher system information, allowing for reduced false alarms and enabling quality checks on powder handling devices by measuring phase differences, which are not limited to operational monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data filtering is applied to reduce false alarms, then false alarm rate decreases, but contamination detection capability deteriorates
Solution Approach 1:
The patent transitions from monitoring resistance magnitude alone to monitoring both resistance magnitude and phase angle. This parameter expansion allows the system to distinguish between cleaning-induced resistance changes (which affect magnitude) and contamination-induced changes (which affect phase), thereby reducing false alarms while maintaining contamination detection capability
Solution Approach 2:
The patent introduces phase angle as an intermediary parameter that mediates between the raw resistance signal and the final contamination determination. By using phase angle information, the system can filter out noise and cleaning-related variations without losing sensitivity to actual contamination events
2Measurement precision
If conventional sensor systems are used for monitoring, then device complexity remains low, but measurement precision deteriorates due to low SNR
Solution Approach 1:
The patent replaces conventional contact-based mechanical sensing with electrical impedance spectroscopy. By using alternating current signals to probe the system, the method achieves higher measurement precision through phase angle detection without requiring complex mechanical sensor assemblies
Solution Approach 2:
The patent makes the existing electrical components (power supply, motor, rotor) multi-functional by using them both for their primary mechanical function and as part of the sensing system. The rotor and housing serve both as mechanical elements and as electrodes for impedance measurement, eliminating the need for separate sensor hardware
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 reduces false alarms and enhances safety by providing accurate monitoring of powder handling devices, enabling quality assurance and condition assessment, including geometry and material properties, thus preventing contamination.
Implementation Method 1
the measuring device is configured to collect measurement data on an input signal and an output signal... wherein the controller is configured to receive the measurement data from the measuring device and determine a phase difference between the input signal and the output signal
Data Source
AI summary
The present invention relates to a sensor system for monitoring a powder handling device. The sensor system comprising an alternating electrical signal source electrically connectable to the powder handling device and a processing device. The processing device comprising a measuring device and a controller communicatively connectable to the measuring device. The controller is configured to receive measurement data from the measuring device and determine a phase difference between an input signal and an output signal based on the received measurement data.