Laser Air-Data Contrail Detection Using Backscattered Light
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Solution Overview
Problem
Existing systems struggle to accurately detect and measure condensation trails (contrails) formed by aircraft engines, particularly in distinguishing between contrails and other aerosols, and to provide real-time feedback for flight planning to avoid potentially harmful, long-lasting contrails contributing to global warming.
Innovation Solution
A laser air-data system with a contrail detection channel that projects a beam of light into the exhaust path of an aircraft engine, using optical receivers to analyze the backscattered light for Doppler-shifted wavelength spectra to determine contrail formation, and employs background light correction and scattering mechanism differentiation to distinguish between aerosols and air molecules, integrating with predictive models for flight management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser air-data system projects a beam of light into the exhaust path to detect contrails, then real-time detection capability is improved, but device complexity increases due to additional optical components and processing requirements
Solution Approach 1:
The laser air-data system is designed to perform multiple functions: standard air data measurement (pressure, temperature, velocity) and contrail detection. By making the system multi-functional, the patent avoids adding a completely separate detection system, thereby improving reliability without proportionally increasing complexity. The optical receiver and processor handle both standard air data signals and contrail detection signals through integrated processing channels.
Solution Approach 2:
The detection system is divided into separate measurement channels - a first air-data measurement channel for standard operations and a second air-data measurement channel specifically forcontrail detection. This segmentation allows independent optimization of each channel while sharing common infrastructure (light source, processor), resolving the contradiction between detection accuracy and system complexity.
2Measurement precision
If the system uses optical receivers to analyze backscattered light for Doppler-shifted wavelength spectra, then measurement precision is improved, but difficulty of detecting and measuring increases due to distinguishing contrails from other aerosols
Solution Approach 1:
The system detectscontrails by analyzing Doppler-shifted wavelength spectra of backscattered light. Different aerosol types (contrail ice crystals vs. other atmospheric particles) produce distinct spectral signatures due to their different scattering properties and motion characteristics. By measuring wavelength shifts and spectral characteristics, the system can differentiatecontrails from other aerosols with high precision.
Solution Approach 2:
The processor continuously analyzes the backscattered light signals and provides real-time feedback oncontrail formation detection. The system compares measured spectral characteristics against reference data and adjusts detection parameters dynamically, improving measurement precision while managing the complexity of aerosol differentiation through adaptive processing.
3Object-affected harmful factors
If the system provides real-time feedback for flight planning to avoid long-lasting contrails, then environmental benefit is improved, but loss of time increases due to additional processing and signal generation requirements
Solution Approach 1:
The system performs preliminary analysis of atmospheric conditions and engine exhaust parameters to predictcontrail formation potential before actualcontrails form. By detecting early signs ofcontrail formation through subtle changes in backscattered light characteristics, the system provides advance warning to flight management, allowing preventive actions to be taken without significant time loss.
Solution Approach 2:
The contrail detection and feedback system operates continuously during flight, constantly monitoring exhaust path conditions and providing uninterrupted real-time feedback. This continuous operation eliminates the need for periodic sampling and processing, reducing time delays while maintaining accurate environmental monitoring to minimizecontrail climate impact.
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
Enables real-time detection of contrail formation, providing accurate metrics for flight planning to avoid long-lasting contrails, enhancing sustainability and reducing climate impact.
Implementation Method 1
The light received by the first optical receiver includes a first reflected portion of the first projected beam of light backscattered by the atmosphere from within the first intersection volume
Implementation Method 2
using optical receivers to analyze the backscattered light for Doppler-shifted wavelength spectra to determinecontrail formation
Implementation Method 3
employs background light correction and scattering mechanism differentiation to distinguish between aerosols and air molecules
Data Source
AI summary
Apparatus and associated methods relate to measuring metrics of a contrail produced by an aircraft engine. To measure such metrics, a beam of light is projected into a projection volume that intersects an exhaust path of the aircraft engine. Light from a reception volume that intersects the exhaust path of the aircraft engine is received. An intersection volume is formed by an intersection of the reception volume and the projection volume. The light received includes a reflected portion of the projected beam backscattered by the atmosphere from within the intersection volume. The reflected portion of light received is used to determine whether a contrail is forming within the intersection volume. An alert is generated in response to determination that a control is forming within the intersection volume.