Laser-Microwave Plasma Generation for Aircraft Shock Wave Control
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Solution Overview
Problem
Existing methods for modifying shock waves around aircraft, such as mechanical spikes and laser-induced optical spikes, are limited by their non-adjustability and the high power requirements of plasma generation systems, which make it difficult to effectively position and control plasma for shock wave reduction.
Innovation Solution
A system using a Ti:sapphire laser to ionize argon in the atmosphere and microwave energy to generate plasma, allowing for adjustable and controlled plasma regions by tuning the laser to the argon resonance and interacting microwave energy with the liberated electrons to create a plasma that can be tailored in size, strength, and location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-power systems are used to generate plasma for shock wave modification, then the plasma generation effectiveness is improved, but the power consumption and system complexity increase
Solution Approach 1:
The plasma generation process is divided into two distinct stages: first, a laser beam ionizes argon atoms to create free electrons; second, microwave energy is applied to these electrons to generate plasma. This segmentation allows each stage to use optimized energy levels, avoiding the need for a single high-power system and reducing overall power consumption while maintaining plasma generation effectiveness.
Solution Approach 2:
The laser performs a preliminary ionization action on the argon atmosphere, creating free electrons before the microwave energy is applied. This preliminary action prepares the medium so that the subsequent microwave energy can efficiently generate plasma with lower power requirements, thereby reducing total power consumption while ensuring reliable plasma generation.
2Reliability
If mechanical spikes are used to break up shock waves, then the shock wave modification is achieved, but the adjustability and positioning flexibility are limited
Solution Approach 1:
The invention replaces mechanical spikes with an optical-microwave system. The laser and microwave components can be dynamically controlled to generate plasma at different positions and with different intensities, providing full adjustability and positioning flexibility while maintaining shock wave modification capability. This substitution of mechanical systems with field-based systems enables real-time adaptation to changing conditions.
Solution Approach 2:
The plasma generation system is inherently dynamic, allowing continuous adjustment of plasma location, size, and intensity by controlling laser and microwave parameters. Unlike fixed mechanical spikes, the plasma can be moved and resized in real-time to adapt to varying shock wave conditions, enhancing both adaptability and versatility while maintaining reliable shock wave modification.
3Adaptability or versatility
If laser beams are used to generate optical spikes for shock modification, then the adjustability is improved, but the power requirements remain high
Solution Approach 1:
The system segments the energy input into two parts: a relatively low-power laser that creates ionization by removing electrons from argon atoms, and a separate microwave source that provides the additional energy needed for plasma generation. This segmentation reduces the peak power requirements compared to using a single high-power laser, while maintaining the adjustability benefits of laser-based positioning.
Solution Approach 2:
The laser acts as an intermediary that prepares the argon atmosphere by creating free electrons, which then serve as the medium for microwave energy to generate plasma. This two-step intermediary process allows the system to achieve plasma generation with lower overall power requirements than direct high-power laser methods, while preserving the ability to adjust plasma location and characteristics.
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 efficient and adjustable plasma generation in the atmosphere, suitable for shock wave modification and reduction, particularly on aircraft, by leveraging the 'three resonant plus one photon' process and adjustable microwave energy delivery.
Implementation Method 1
A laser beam from a Ti:sapphire laser in resonance with argon is directed into the gaseous atmosphere such that at least a portion of the argon in the gaseous atmosphere along the laser beam is ionized to liberate free argon electrons
Implementation Method 2
Microwave energy focused into the laser beam interacts with the free argon electrons to generate a region of plasma
Implementation Method 3
Microwave energy focused into the laser beam interacts with the free argon electrons to generate a region of plasma
Data Source
AI summary
A method is provided for generating a region of plasma in a gaseous atmosphere that includes argon. A laser beam from a Ti:sapphire laser is directed into the gaseous atmosphere such that a portion of the argon along the laser beam is ionized. Microwave energy is directed into the ionized region of the laser beam to generate a plasma.