Capacitive Sensor Real-Time Status Tracking
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Solution Overview
Problem
Capacitive sensors in turbomachines face challenges in real-time monitoring and diagnosis due to electrical line losses and environmental factors like temperature and mechanical loads, which affect measurement reliability.
Innovation Solution
A method for real-time monitoring of capacitive sensors involves generating compensation signals for parasitic effects and analyzing the operating point in a two-dimensional space of capacitance and conductance values to determine if the sensor is within a predetermined operational zone, triggering alarms and diagnostics for potential failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If capacitive sensors are used for real-time measurement in turbomachines, then measurement capability is improved, but measurement reliability deteriorates due to electrical line losses and environmental factors
Solution Approach 1:
The patent implements feedback mechanisms by continuously monitoring the operating point of the capacitive sensor and comparing it against a predetermined zone. Compensation signals are generated based on the deviation from the nominal operating point, creating a closed-loop system that maintains measurement reliability despite environmental variations and electrical line losses.
Solution Approach 2:
The patent monitors changes in sensor parameters (capacitance and conductance values) over time and compensates for these changes by adjusting the operating point. The system adapts to environmental factors by tracking parameter drift and maintaining measurements within acceptable ranges through dynamic parameter adjustment.
2Measurement precision
If compensation signals are generated for parasitic effects, then measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The electronic module performs multiple functions: it generates compensation signals for both capacitance and conductance parasitic effects, monitors the operating point, and validates measurements. By consolidating these functions into a single module, the patent reduces overall system complexity while maintaining high measurement accuracy through multi-functional integration.
3Reliability
If the sensor is monitored in real-time over its entire operating life, then blade health monitoring is improved, but the sensor is exposed to cumulative thermal and mechanical loads that accelerate degradation
Solution Approach 1:
The patent establishes a predetermined zone for the sensor operating point before actual operation begins. This pre-defined safety margin allows the system to detect and compensate for degradation trends before they lead to failure, cushioning against the cumulative effects of thermal and mechanical loads over the sensor's entire operating life.
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
Ensures reliable real-time monitoring and diagnosis of capacitive sensors, accounting for temperature and other environmental factors, thereby maintaining measurement accuracy and detecting potential faults in the sensor or transmission line.
Implementation Method 1
capacitive sensor capable of being mounted on a rotating machine, and connected to an electronic measurement module via a transmission line at high frequency
Data Source
Figure 1
Figure 2~4
AI summary
The invention relates to a method for real-time tracking of the operational status of a capacitive sensor mountable onto a rotatable machine and connected to an electronic measurement module via a high-frequency transmission line. Said method includes the steps of: generating, within the electronic module, a signal of conductance compensation for interference from the transmission line and the sensor; generating, within the electronic module, a signal of capacitance compensation for the transmission line and the sensor; sampling a signal representing the capacitance compensation and a signal representing the conductance compensation such as to determine an operation point of the sensor; and analyzing the operation point so as to verify if it is located in a predetermined area.