Ion Source Electrode Cleaning via Laser Ablation
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Solution Overview
Problem
Existing ion source cleaning methods using UV laser light for MALDI mass spectrometers face issues such as rapid degradation of optical components due to photo-contamination and inefficiencies from optical scattering, leading to frequent component replacement and reduced cleaning effectiveness.
Innovation Solution
The method employs laser etching to remove contaminants from the electrode surface by physically ablating the substrate layer, using a separate ablating light source that does not include ionizing light, allowing for efficient cleaning without relying on adsorption/desorption properties or heating the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UV laser light is used for cleaning contaminant material from electrode surfaces, then cleaning effectiveness is improved through efficient absorption and desorption, but optical components degrade rapidly due to photo-contamination and scattering
Solution Approach 1:
The patent extracts the harmful UV wavelength component from the laser system while retaining the cleaning function. A dichroic beamsplitter separates the UV light (which causes photo-contamination) from the visible/IR light (which performs cleaning), allowing the harmful component to be removed while preserving the beneficial cleaning effect through alternative wavelengths.
Solution Approach 2:
The patent changes the wavelength parameter of the cleaning light from UV to visible/IR range. By operating at wavelengths longer than 400nm, the system avoids the photo-contamination effects that plague UV lasers while maintaining effective contaminant desorption through adjusted laser parameters such as pulse duration and intensity.
2Productivity
If UV laser light is used to desorb contaminant material, then cleaning efficiency is improved, but optical scattering from desorbed particles reduces cleaning effectiveness
Solution Approach 1:
The patent changes the wavelength parameter to visible or IR range where Rayleigh scattering is significantly reduced (scattering efficiency is inversely proportional to the fourth power of wavelength). This parameter change reduces energy loss to scattering while maintaining cleaning efficiency through optimized pulse parameters.
3Device complexity
If the same UV laser is used for both MALDI ionization and cleaning, then device complexity is reduced, but the cleaning process accelerates optical component degradation
Solution Approach 1:
The patent segments the laser output into different wavelength components using a dichroic beamsplitter. The UV component is directed for MALDI ionization while the visible/IR component is directed for cleaning operations, allowing simultaneous use of the same laser source for both functions without cross-contamination effects.
Solution Approach 2:
The dichroic beamsplitter acts as an intermediary that separates the different functional requirements (ionization vs. cleaning) into distinct wavelength pathways. This intermediary component enables the single laser to serve dual purposes while protecting optical components from photo-contamination.
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 effectively removes embedded contaminants, extends the lifespan of optical components, and maintains cleaning efficiency by avoiding the limitations of UV light usage, such as photo-contamination and scattering, thereby reducing maintenance costs and improving service intervals.
Implementation Method 1
an ablating light source arranged to output an ablating light beam or pulse(s) for ablating material of the electrode from the electrode surface
Implementation Method 2
a reflector for reflecting the ablating light onto the electrode surface
Implementation Method 3
an ionising light source arranged to output ionising light for ionising the sample material
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
Anion source comprises an ionising light source arranged to output ionising light for ionising a sample material, an electrode presenting an electrode surface for attracting the ionised sample material and upon which contaminant material is able to accumulate, and an ablating light source arranged to output an ablating light beam or pulse(s) for ablating material of the electrode from the electrode surface. The ablating light beam or pulse(s) does not include said ionising light. A reflector for reflecting the ablating light onto the electrode surface, therewith by a process of ablation a part of the electrode surface is removable from the electrode together with contaminant material when accumulated upon that part.