Self-Powered Lightning Detection via Current Return Network Resonance
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Solution Overview
Problem
Current systems for reporting lightning strikes on aircraft often result in over or under reporting due to reliance on visual confirmation or initial electrical interference, leading to potential damage and manual reset of electrical systems, necessitating a more accurate detection method.
Innovation Solution
A self-powered lightning strike detection system utilizing a current return network with a resonant circuit, transformer, rectifier, integrator circuit, and output transistor to detect current spikes, providing an alternating and then direct electrical output, and external monitoring equipment to accurately indicate lightning strikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual confirmation or initial electrical interference is used to detect lightning strikes, then the system is simple and requires minimal components, but the accuracy of detection is poor leading to over or under reporting
Solution Approach 1:
The patent introduces an intermediary detection system that uses the aircraft's existing current return network as a sensor. A separate detection circuit monitors voltage changes in this network, acting as a mediator between the lightning strike event and the warning system. This intermediary approach enables accurate detection without requiring direct sensing of the strike itself.
Solution Approach 2:
The detection system leverages the aircraft's own current return network, which already exists for lightning protection purposes, to serve dual functions: both protecting against damage and detecting strikes. The system uses existing electrical infrastructure rather than adding dedicated sensing hardware, reducing overall system complexity while improving accuracy.
2Reliability
If manual determination by aircraft crew is used to report lightning strikes, then the system requires minimal equipment, but the reliability of reporting is poor due to human error and subjective assessment
Solution Approach 1:
The patent implements a feedback mechanism where the detection circuit continuously monitors the current return network and automatically triggers a warning when a lightning strike is detected. This closed-loop feedback system replaces subjective human assessment with objective, automated detection, significantly improving reporting reliability while maintaining simple system architecture.
Solution Approach 2:
The patent replaces the mechanical/manual process of visual confirmation and crew assessment with an electrical detection system. The automatic electrical sensing and warning mechanism substitutes human judgment, eliminating errors associated with visual confirmation and subjective evaluation while keeping the overall system relatively simple.
3Measurement precision
If electrical system warnings are issued after lightning strikes, then the system can detect strikes, but nuisance warnings occur due to system resetting rather than actual problems
Solution Approach 1:
The patent detects and records the lightning strike event at the moment it occurs, before any system resetting or fault conditions develop. By capturing the strike event timing and characteristics in advance, the system can later distinguish between genuine strike effects and nuisance warnings from system resets, improving precision without requiring complex real-time analysis.
Solution Approach 2:
The system uses periodic monitoring of the current return network to detect strike events. By establishing a regular monitoring rhythm and comparing deviations from normal periodic operation, the system can distinguish between actual lightning strikes and temporary system fluctuations, reducing false warnings while maintaining detection sensitivity.
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 effectively detects lightning strikes by changing the state of a transistor when a voltage threshold is reached, reducing false alarms and enabling automatic reset, thus improving accuracy and reducing manual intervention in aircraft maintenance.
Implementation Method 1
a resonant circuit having a transformer in communication with the current return network and providing an alternating electrical output
Implementation Method 2
a rectifier for rectifying the alternating electrical output into a direct electrical output
Implementation Method 3
an integrator circuit that builds to a voltage threshold when the direct electrical output is received, including a second capacitor
Data Source
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Figure 3A
AI summary
Described herein is a self-powered system for detecting a current spike. The current spike is delivered through a current return network that energizes a resonant circuit to produce an alternating electrical output. The output is rectified by a rectifier into direct output that is then transferred to an integrator circuit. The integrator circuit slowly builds to and dissipates from a voltage threshold corresponding to an output transistor. When the output transistor is triggered by the voltage threshold this trigger is communicated to a fault monitoring software that recognizes the current spike.