Optical Fiber Aerodynamic Flow Characterization
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Solution Overview
Problem
Existing devices for characterizing aerodynamic streams along aircraft surfaces are not robust enough for industrial use, sensitive to environmental factors, and fail to accurately measure dynamic phenomena like buffeting and flutter, due to issues with thermal and pressure sensor integration and electromagnetic susceptibility.
Innovation Solution
A device using optical fibers with temperature-sensitive nodes that heat and measure the wall temperature, allowing for differentiation of temporal and spatial speed variations, and comparison with predefined models to identify laminar, turbulent, and transition zones, while being insensitive to thermal, mechanical, acoustic, and electromagnetic environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal sensors are used to measure aerodynamic stream speed, then measurement capability is provided, but electromagnetic susceptibility and environmental sensitivity increase
Solution Approach 1:
The patent replaces thermal sensors (which are susceptible to electromagnetic interference) with a laser-based optical measurement system. The laser measures wall temperature through optical means rather than electrical thermal sensors, eliminating electromagnetic susceptibility while maintaining measurement capability for aerodynamic stream characterization.
Solution Approach 2:
The patent introduces the aircraft wall as an intermediary medium. Instead of placing sensors directly in the aerodynamic stream (which would be susceptible to environmental factors), the system measures temperature through the wall material itself, using the wall as a protective intermediary that shields the measurement system from direct exposure to harmful environmental factors.
2Measurement precision
If pressure sensors are integrated into aircraft surfaces, then dynamic phenomena detection is enabled, but device complexity and integration difficulty increase
Solution Approach 1:
The patent employs a single laser-based system that serves multiple measurement functions simultaneously. The same optical infrastructure measures both static temperature distribution and dynamic phenomena (buffeting, flutter), eliminating the need for separate sensor systems and reducing overall device complexity.
Solution Approach 2:
The patent combines static temperature measurement and dynamic phenomenon detection into a unified laser-based optical system. By merging these functions into a single measurement infrastructure, the system reduces integration complexity compared to using separate thermal and pressure sensor systems.
3Measurement precision
If multiple sensors are distributed along the aircraft surface, then spatial distribution measurement is achieved, but manufacturing and integration difficulty increase
Solution Approach 1:
The patent transitions from distributing multiple discrete sensors across the surface to using a laser that scans or measures along the surface. This dimensional change from discrete point sensors to a continuous optical measurement approach simplifies manufacturing and integration while maintaining spatial distribution measurement capability.
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 device provides robust, accurate characterization of aerodynamic streams, including dynamic phenomena, with reduced maintenance costs and simplified integration into aircraft surfaces, improving fuel efficiency and structural protection by optimizing flow profiles.
Implementation Method 1
each node comprising an element heating the wall and an element sensitive to the temperature of the wall
Implementation Method 2
the heating element comprises an optical fiber conducting luminous radiation toward the wall to heat it and the sensitive element comprises an optical fiber which integrates a Bragg grating
Implementation Method 3
the sensitive element comprises an optical fiber which integrates a Bragg grating which is able to alter radiation conducted by the optical fiber of the sensitive element, the alteration being dependent on the temperature of the wall
Implementation Method 4
The temperature of this heating element is servo controlled and the power dissipated by the heating element to obtain the setpoint temperature is representative of the speed of the flow of the aerodynamic stream along the wall
Data Source
AI summary
A device for characterizing the nature of an aerodynamic stream along a wall, the device including multiple temperature-sensitive optical nodes of Bragg grating type distributed along an optical fiber. The device determining the variations in speed of the aerodynamic stream. The nodes are distributed along a fiber placed substantially following the route of a streamline, and the device processing so as to differentiate the temporal and spatial characteristics of the signals of thermal flowrate among the nodes.