Aircraft Lightning Strike Detector Using AC-Coupled Magnetic Field Sensor
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Solution Overview
Problem
Current methods for detecting lightning strikes on aircraft are inefficient, as they rely on post-flight visual inspections and may not accurately determine if a strike occurred, leading to unnecessary maintenance efforts and potential undetected damage from temporary equipment upsets.
Innovation Solution
An AC-coupled magnetic field detector is mounted on the aircraft to measure changes in magnetic fields induced by lightning strikes or nearby events, with a threshold mechanism to determine if the event is significant and record it for post-flight analysis, alerting the pilot and storing data for maintenance review.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If post-flight visual inspection is conducted to determine lightning strike, then maintenance personnel can identify damage, but the process is time-consuming and may not accurately determine if a strike occurred
Solution Approach 1:
The system performs detection action during the flight event itself rather than waiting for post-flight inspection. The sensor detects lightning strike indicators in real-time, and the processor stores this data before the flight concludes, eliminating the need for time-consuming post-flight visual inspections while maintaining accurate strike determination.
Solution Approach 2:
The patent replaces the mechanical visual inspection method with an electronic detection system. Instead of maintenance personnel physically inspecting the aircraft for damage, an electronic sensor detects electromagnetic indicators of lightning strikes, and a processor analyzes the data to determine strike occurrence, significantly reducing inspection time and improving accuracy.
2Reliability
If pilot reports observed lightning, then maintenance crew can search for damage, but unnecessary maintenance efforts are performed when no actual strike occurred
Solution Approach 1:
The system replaces subjective pilot observation with objective electronic detection. The sensor automatically detects lightning strike indicators and the processor analyzes the data to determine whether an actual strike occurred, eliminating unnecessary maintenance efforts while improving identification accuracy through scientific measurement rather than visual estimation.
Solution Approach 2:
The system provides feedback to maintenance personnel about whether an actual lightning strike occurred based on sensor data analysis. The processor compares detected indicators against predetermined thresholds and provides actionable information that guides maintenance decisions, preventing unnecessary maintenance operations on aircraft that were not actually struck.
3Ease of repair
If visual inspection is conducted to find damage locations, then maintenance can focus on affected areas, but the instantaneous nature of lightning strike makes observation difficult
Solution Approach 1:
The sensor detects and the processor records damage location indicators during the instantaneous lightning strike event itself, before the aircraft returns to normal operation. This preliminary detection and recording of strike indicators at the time of the event makes later maintenance location identification straightforward and accurate.
Solution Approach 2:
The patent introduces an intermediary detection system between the lightning strike and maintenance personnel. The sensor acts as an intermediary that captures strike indicators at the moment of the event, and the processor serves as an intermediary that analyzes and translates this data into actionable location information, overcoming the difficulty of directly observing the instantaneous strike.
4Reliability
If equipment is removed and tested after temporary upset from lightning, then equipment reliability is ensured, but time and expense are consumed when equipment recovers automatically
Solution Approach 1:
The system provides feedback to maintenance personnel about the severity and effects of the lightning strike through sensor data analysis. By understanding the actual strike characteristics and their impact on specific systems, maintenance personnel can determine whether equipment recovery is sufficient or if removal and testing are necessary, avoiding unnecessary time and expense while ensuring reliability when needed.
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
Accurately detects and records lightning events, reducing the need for costly and time-consuming post-flight inspections by identifying potential damage locations and distinguishing between actual strikes and induced currents, thereby optimizing maintenance operations.
Implementation Method 1
An AC-coupled magnetic field detector is mounted to an exterior or in the radome of the aircraft, that measures the strength of change in magnetic fields with respect to time that are induced by either direct lightning strikes or nearby lightning events.
Data Source
AI summary
An aircraft lightning event detector includes a sensor mounted to an aircraft. The sensor determines whether a lightning event has struck the aircraft or induced a possibly damaging current into the aircraft. A threshold mechanism determines whether the sensed lightning event is greater than a predetermined size. A memory stores a record of the sensed lightning event for post-flight maintenance analysis when the lightning event is greater than the predetermined size.