Particle Sensor Dynamic Range via Segmented Interrogation Volumes
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Solution Overview
Problem
Current particle detection systems for aircraft are unable to effectively detect particles with a wide dynamic range of sizes, particularly supercooled large water droplets, which can lead to icing issues, while sacrificing detection sensitivity for smaller particles like volcanic ash, potentially causing engine damage or failure.
Innovation Solution
A particle detection system utilizing multiple interrogation volumes with varying sizes, combined with focused transmitter beams and receiver fields of view, and amplifier systems to maintain sensitivity across a broad range of particle sizes, allowing for simultaneous detection of small and large particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If typical high dynamic range particle detection systems are used to detect large particles, then particle size detection dynamic range is increased, but detection sensitivity for small particles is diminished
Solution Approach 1:
The detection system is segmented into multiple independent detection channels, each optimized for specific particle size ranges. The system divides the particle detection task into separate interrogation volumes and signal processing paths, allowing each channel to maintain high sensitivity for its designated size range while collectively covering a broad dynamic range from small to large particles
Solution Approach 2:
The patent introduces multiple spatial dimensions by creating separate interrogation volumes at different distances from the transmitter. By utilizing range gating to select signals from specific volumetric regions, the system adds a spatial dimension to particle detection, enabling simultaneous optimization for different particle sizes through selective volume interrogation
2Measurement precision
If detection sensitivity is maintained for small particles, then detection accuracy of small particles is preserved, but particle size detection dynamic range is limited
Solution Approach 1:
The detection system achieves multi-functionality by incorporating multiple receiver channels with different gain settings and interrogation volume configurations. Each channel serves a specific particle size range, but collectively they provide universal detection capability across the entire dynamic range, allowing the same hardware system to accurately detect both small particles requiring high sensitivity and large particles requiring high dynamic range
3Device complexity
If a single interrogation volume is used, then device complexity is reduced, but ability to detect particles across wide size range is compromised
Solution Approach 1:
The system employs dynamic signal processing through range gating, which selectively extracts signals from specific temporal and spatial windows corresponding to different interrogation volumes. This dynamic approach allows the system to adaptively focus on different particle size ranges by adjusting the gating parameters, providing versatile detection capability without requiring physically reconfigurable 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 achieves high dynamic range particle detection while maintaining sensitivity, enabling accurate characterization of particles from three to five thousand microns, thereby enhancing aircraft safety by detecting both small and large particles effectively.
Implementation Method 1
Modern particle sensors using optical transceiver systems
Implementation Method 2
optical transceiver systems
Data Source
AI summary
A particle detection system is provided. The particle detection system comprises at least one transmitter; at least one receiver; a first interrogation volume formed by a first intersection of a first pair of a transmitter beam of a transmitter and a receiver field of view of a receiver; and a second interrogation volume formed by a second intersection of a second pair of a transmitter beam of a transmitter and a receiver field of view of a receiver.