Integrated Electrostatic Sensor for Engine Dust Detection
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Solution Overview
Problem
Current dust sensors in gas turbine engines face challenges with inaccurate data due to signal noise from cabling vibrations and triboelectric effects, making it difficult to accurately assess engine conditions, especially during takeoff and climb.
Innovation Solution
An integrated electrostatic sensor system with an outer housing, internal electrode, and amplifier minimizes signal noise by reducing the distance between sensor input and electrode, providing high sensitivity and robust dust detection, capable of detecting small changes in dust levels and other airborne particulates like ice and volcanic ash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are mounted on the engine with cables and connectors, then the sensor system can detect dust particles, but the motion or vibration of the cabling produces signal noise that exceeds the dust particle signal
Solution Approach 1:
The patent integrates the amplifier electronics directly within the sensor housing, merging the sensing element and signal processing components into a single unit. This eliminates external cabling and connectors that generate vibration-induced noise, thereby resolving the contradiction between achieving dust particle detection and avoiding signal noise from cabling motion.
Solution Approach 2:
The patent extracts the amplifier from the external cabling system and places it inside the sensor housing. This removes the harmful cabling vibration noise source from the measurement system while retaining the necessary signal amplification function, thus improving measurement precision by eliminating the harmful factor.
2Measurement precision
If conventional engine-mounted sensor systems are used, then dust detection is possible, but triboelectric and piezoelectric effects of the cables and connectors degrade measurement accuracy
Solution Approach 1:
By integrating the amplifier electronics within the sensor housing, the patent eliminates external cables and connectors that are sources of triboelectric and piezoelectric effects. This merging of components removes the harmful electrostatic effects while maintaining the signal amplification necessary for accurate dust particle detection.
3Measurement precision
If the distance between sensor input and electrode is reduced, then signal noise is minimized and sensitivity is improved, but the sensor design becomes more complex
Solution Approach 1:
The patent integrates the amplifier directly with the sensing electrode within the same housing, merging the signal input and processing components into a compact assembly. This integration minimizes the distance between the sensing electrode and amplifier input, reducing signal noise and improving sensitivity, while the modular housing design manages the structural complexity.
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 solution offers more accurate, reliable, and low-maintenance dust detection with improved sensitivity and frequency response, capable of detecting dust levels as low as one part in seven million by mass, and can detect internally generated particles and debris.
Implementation Method 1
Charged particles in the flow of gas passing along the electrode induce a current passing from the electrode through the current measuring device
Data Source
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Figure 2
Figure 3~4
AI summary
The present disclosure is directed to an integrated electrostatic sensor (75) for detecting dust and/or other airborne particulates in an engine, e.g. in an aircraft gas turbine engine. The electrostatic sensor (75) includes an outer housing (76) having a sensing face (79), an electrode (83) configured within the outer housing (76) adjacent to the sensing face (79), and an amplifier (84) configured with the electrode (83). The electrode (83) contains a plurality of electrons (85) configured to move as charged dust particles flow past the sensing face (79). Thus, the amplifier (84) is configured to detect a dust level as a function of the electron movement. The electrostatic sensor (75) also includes a circuit board (86) configured within the outer housing (76) and electrically coupled to the amplifier (84). Thus, the circuit board (86) is configured to send the one or more signals to a controller of the engine indicative of the dust level.