Non-radioactive Plasma Ion Source for Stable Ionization
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Solution Overview
Problem
Current ion generation methods for ion mobility spectrometry, such as corona discharge, UV ionization, and RF discharge, face limitations including instability, contamination, limited ionization energies, and inability to optimize plasma parameters, which restrict the types of molecules that can be ionized and reduce sensitivity, especially for negative ion species.
Innovation Solution
A non-radioactive plasma ion source utilizing a housing with planar electrodes and a discharger chamber, generating a homogeneous electric field to separate and direct ionized plasma species, allowing for the production of both positive and negative ions through controlled gas flows and counterflows, effectively mimicking the ionization capabilities of radioactive sources without the associated regulatory and cost burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radioactive ion sources are employed to ionize chemicals, then ionization efficiency and stability are improved, but operational cost and regulatory burden increase significantly
Solution Approach 1:
The patent replaces expensive, regulated radioactive sources with inexpensive, non-radioactive gas discharge components. The ion source uses readily available gases (air, nitrogen, oxygen) and simple electrical discharge mechanisms instead of costly radioactive isotopes like americium-241, eliminating the need for licensing, certification, and special disposal procedures while maintaining reliable ionization performance
Solution Approach 2:
The patent changes the fundamental parameter of ionization method from radioactive decay to controlled gas discharge. By adjusting electrical parameters (voltage, current, frequency) and gas composition, the system achieves stable ionization without the inherent safety and regulatory constraints of radioactive materials, thereby reducing operational costs and administrative burdens
2Object-affected harmful factors
If conventional gas discharge methods are used for ionization, then non-radioactive operation is achieved, but plasma temperature cannot be optimized and contaminant formation increases
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the discharge chamber: a cold plasma region for selective ionization and a hot plasma region for contaminant removal. By controlling electrical parameters and gas flow patterns in different spatial locations, the system achieves optimized plasma conditions that minimize NOx and ozone formation while maintaining effective ionization capability
Solution Approach 2:
The patent implements dynamic control of plasma parameters through adjustable electrical discharge settings and variable gas flow rates. This allows real-time optimization of plasma temperature and composition to minimize contaminant formation, adapting conditions based on specific analytical requirements and analyte types
3Power
If high-powered electromagnetic induction is used for ionization, then ionization capability is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the essential ionization function from complex high-powered electromagnetic induction systems. By using simple electrical discharge between electrodes in a controlled gas atmosphere, the system achieves effective ionization without the need for complex RF generators, magnetic field control systems, and associated infrastructure required by electromagnetic induction methods
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 solution enables efficient and controlled ionization of gas samples, producing high-purity analyte ions that can be analyzed, reducing operational costs and administrative expenses, and expanding applications to civilian fields like air quality monitoring and medical diagnostics, while avoiding the risks and restrictions associated with radioactive sources.
Implementation Method 1
capacitive discharge plasma ion source
Implementation Method 2
ionized plasma includes positive ions, negative ions and electrons
Implementation Method 3
A homogeneous direct-current electric field is generated by applying a plurality of DC voltages to a sequence of distributed planar electrodes
Implementation Method 4
the charged particles of the ionized plasma to move from the discharger chamber through the second and first gas inlet chambers to the analyte gas outlet
Data Source
AI summary
A non-radioactive plasma ion source device includes at least four planar electrodes that define at least three chambers, including a discharger chamber and at least two additional chambers aligned along a major longitudinal axis of the housing. A discharger ionizes at least one of a transport gas and a discharge gas to form ions in the discharger chamber that are directed by a homogeneous electric field generated by the planar electrodes toward an analyte gas outlet. Ionized species of at least one of the transport gas and the discharge gas that are not entrained by a counterflow gas stream are discharged from the discharger chamber to form a stream of ionized particles that ionize a sample gas and thereby form a stream of ionized analyte particles of the same polarity. The ionized analyte particles are entrained with the stream of ionized particles and pass through an analyte gas outlet to an analyzer.