Controlled Plasma Refraction for Electromagnetic Wave Steering
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Solution Overview
Problem
Existing optical systems fail to effectively redirect electromagnetic radiation around objects of interest, leading to undesirable interference and reflections, particularly in environments with metal structures and antenna test facilities.
Innovation Solution
A system comprising concentric assemblies of propellant gas enclosed by walls, where the electron number density of the plasma is controlled to achieve specific indices of refraction, minimizing reflection by creating a tapered refractive index profile around the object of interest, using control systems to energize the gas and manage the plasma's electron density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If electromagnetic radiation is allowed to propagate freely in environments with metal structures, then communication and testing operations can be conducted, but undesirable reflections and interference occur
Solution Approach 1:
The patent introduces plasma as an intermediary medium between electromagnetic radiation and metal structures. The plasma, with its controllable subunity index of refraction, acts as a mediator that refracts and redirects electromagnetic waves around objects of interest, preventing direct reflections from metal surfaces while allowing radiation propagation.
Solution Approach 2:
The patent changes the physical parameter of the plasma's electron number density to achieve a subunity index of refraction. By controlling this parameter, the plasma's refractive properties are optimized to minimize reflections and redirect electromagnetic radiation effectively, transforming the plasma from a simple ionized gas into a functional optical element.
2Object-affected harmful factors
If conventional reflection minimization techniques are used, then some interference is reduced, but effectiveness is insufficient particularly with metal structures
Solution Approach 1:
The patent achieves superior reflection minimization by changing the fundamental optical parameter of the plasma - its index of refraction - to be less than unity. This parameter change enables the plasma to actively refract electromagnetic waves rather than merely passively blocking or absorbing them, providing more effective interference reduction especially for metal structures.
Solution Approach 2:
The patent employs dynamic control of the plasma's electron number density through control systems that adjust RF power input. This allows real-time optimization of the plasma's refractive index to match specific operational requirements and electromagnetic frequency bands, enhancing the reliability and adaptability of interference reduction.
3Ease of operation
If plasma is used to redirect electromagnetic radiation, then reflection is minimized and waves are steered around objects, but control of electron number density is required
Solution Approach 1:
The patent incorporates control systems that monitor and adjust the plasma's electron number density based on operational conditions. This feedback mechanism ensures the plasma maintains the desired subunity index of refraction despite variations in gas flow, temperature, or incident electromagnetic radiation characteristics, simplifying operation while managing the inherent complexity.
Solution Approach 2:
The patent designs the plasma generation system to self-regulate to some extent through the natural relationship between RF power input and electron density. The system automatically adjusts plasma properties in response to changes in input power, reducing the burden on external control systems and simplifying overall operation.
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 solution effectively steers electromagnetic waves away from objects, reducing interference by minimizing reflections through controlled plasma refraction, applicable in shielding support structures and reducing RF transmission interference.
Implementation Method 1
an index of refraction of the plasma is less than one, and thereby diverting the electromagnetic radiation around the object of interest
Implementation Method 2
A first control system is configured to energize the propellant gas within the first assembly to provide a first volume of plasma
Data Source
AI summary
Systems and methods are provided for redirecting electromagnetic radiation around an object. A first assembly, including a first interior wall and a first exterior wall enclosing a propellant gas, substantially encloses the object. A first control system is configured to energize the propellant gas to provide a first volume of plasma and control an electron number density of the first volume of plasma. The electron number density of the first volume of plasma is selected to minimize reflection of the electromagnetic radiation from the first exterior wall. A second assembly includes a second interior wall and a second exterior wall enclosing a propellant gas and is substantially concentric with the first assembly and substantially encloses the object. A second control system is configured to energize the propellant gas to provide a second volume of plasma and control an electron number density of the second volume of plasma.