Dielectric Resonator Microwave Plasma Spectrometer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Inductively coupled plasma sources face issues with nonuniform plasma generation due to mutual capacitance in conductive coils, leading to energy inefficiencies, instability, and corrosion, as well as the need for bulky and expensive tuning capacitors for resonant structures.
Innovation Solution
A dielectric resonator structure with a radiofrequency power source is used to promote alternating polarization current flow, eliminating capacitive coupling and enabling efficient plasma generation with improved uniformity and reduced energy losses, using materials like alumina or calcium titanate with high dielectric constants and low losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conductive coil is used to generate plasma inductively, then plasma generation is achieved, but nonuniform plasma distribution and energy losses occur due to mutual capacitance between coil turns
Solution Approach 1:
A dielectric resonator is introduced as an intermediary between the radiofrequency power source and the plasma. The resonator couples electromagnetic energy to the plasma through its evanescent fields, eliminating the need for direct conductive coil contact and the associated mutual capacitance losses, thereby achieving both uniform plasma distribution and reduced energy loss
Solution Approach 2:
The patent replaces the traditional conductive coil mechanism with a dielectric resonator system that uses electromagnetic resonance and evanescent field coupling. This substitution eliminates the mechanical and electrical limitations of conductive coils, including mutual capacitance and associated energy losses
2Reliability
If a conductive coil is used for plasma generation, then plasma is produced, but the coil and surrounding components are subject to corrosion and thermal damage
Solution Approach 1:
The dielectric resonator serves as a protective intermediary that isolates conductive components from direct exposure to corrosive plasma and extreme thermal conditions. The resonator's evanescent fields enable plasma generation while the physical barrier protects surrounding components from damage
Solution Approach 2:
The dielectric resonator creates an inert electromagnetic environment that prevents corrosive interactions between the plasma and conductive coil materials. The resonator structure allows energy transfer without direct material contact, eliminating corrosion pathways
3Power
If traditional resonant structures are used to couple power into plasma, then resonant enhancement is achieved, but bulky and expensive tuning capacitors are required
Solution Approach 1:
The dielectric resonator is self-resonant at its operating frequency, eliminating the need for external tuning capacitors. The resonator's geometry and material properties inherently provide the necessary resonant conditions for efficient power coupling, making the system self-sufficient and eliminating bulky external components
Solution Approach 2:
The dielectric resonator performs multiple functions simultaneously: it acts as the resonant structure for power coupling, generates the evanescent fields for plasma excitation, and provides electromagnetic shielding. This multi-functionality eliminates the need for separate tuning capacitors and simplifies the overall system
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
This approach provides uniform plasma generation with reduced energy losses, improved control over ion speeds and trajectories, and eliminates the need for bulky cooling systems and expensive capacitors, enabling higher power coupling and robust operation at high temperatures.
Implementation Method 1
A dielectric resonator structure having a central axis and a radiofrequency power source electrically coupled to the dielectric resonator structure to promote an alternating polarization current flow at a natural resonant frequency of the dielectric resonator structure about the axis to generate plasma in an adjacent gas
Implementation Method 2
promote an alternating polarization current flow at a natural resonant frequency of the dielectric resonator structure
Implementation Method 3
alternating polarization current flow in the dielectric resonator structure
Implementation Method 4
generate plasma in an adjacent gas
Data Source
AI summary
A dielectric resonator is excited at its natural resonant frequency to produce a highly uniform electric field for the generation of plasma. The plasma may be used as a desolvator, atomizer excitation source and ionization source in an optical spectrometer or a mass spectrometer.