Multi-Passage Oil Debris Sensor for High-Flow Particle Detection
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Solution Overview
Problem
Aerospace systems, such as gas turbine engines, face challenges in detecting fine metallic debris due to noise-induced signal interference from vibration and pressure pulsations, which reduces the signal-to-noise ratio (SNR) in oil debris monitoring sensors, making it difficult to detect small particles effectively, especially as oil flow increases, and existing solutions like dual sensors increase weight, cost, and complexity.
Innovation Solution
A multi-passage oil debris monitoring sensor with coils wound in different directions and a dielectric between passages, allowing for improved signal detection by generating opposing magnetic fields and using channel isolation algorithms to accurately identify particle presence and size, enhancing sensitivity to smaller particles without increasing back pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the sensor bore is increased to fit into the lubrication system as oil flow increases, then the sensor can handle higher oil flow without choking the system, but the detection capability for small particles decreases and the signal-to-noise ratio continues to decrease
Solution Approach 1:
The single sensor bore is segmented into multiple passages (e.g., three passages) within the same sensor housing. Each passage has a smaller bore size optimized for detecting fine particles, while the combined capacity of multiple passages handles the total oil flow requirement. This segmentation allows the system to maintain small bore dimensions for high SNR while collectively accommodating large oil flow volumes.
2Measurement precision
If two ODM sensors are installed in the system in parallel to meet detection requirements, then the detection capability for small particles is improved, but the weight, cost, and complexity of the sensors and harnesses and plumbing doubles
Solution Approach 1:
Multiple passage bores are merged into a single sensor housing with shared coil assemblies and electronics. The sensor housing contains multiple passages that converge into a common outlet, allowing a single sensor unit to perform the function of multiple sensors. This merging reduces the number of separate sensor assemblies, harnesses, and mounting requirements while maintaining the detection capability for fine particles.
3Productivity
If the sensor bore is increased to fit into the lubrication system, then the sensor can handle higher oil flow, but the signal-to-noise ratio for the same sized particle will continually decrease
Solution Approach 1:
The oil flow path is segmented into multiple separate passages, each with optimized small bore dimensions that maintain high signal-to-noise ratios for particle detection. The segmentation allows each passage to function as an independent detection channel with optimal hydraulic diameter, preventing the SNR degradation that would occur in a single large-bore sensor while collectively handling the required oil flow throughput.
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 increases the signal-to-noise ratio, enabling detection of smaller particles while maintaining low back pressure, reducing the risk of missing small particles and addressing the limitations of dual sensors, thus enhancing condition-based maintenance capabilities in aerospace systems.
Implementation Method 1
a multiple of passages within a housing, each of the multiple of passages surrounded by a set of coils for particle detection
Implementation Method 2
a first field coil, a sensor coil, and a second field coil around the first passage and along the first axis
Data Source
AI summary
An oil debris monitoring sensor includes a multiple of passages within the housing, each of the multiple of passages surrounded by a set of coils to detect a particle. A method for determining a presence of a particle in a system includes a) installing a single sensor in-line with an oil flow path; b) communicating oil through a multiple of passages within the housing of the single sensor; c) detecting a particle through the single sensor; and d) isolating the particle to one of the multiple of passages within the sensor housing.