Mass Spectrometer Electron Emitter Normalization
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Solution Overview
Problem
Existing mass spectrometers require time-consuming recalibration and sample scrap when switching between filaments due to differences in ion intensity, which can be caused by variations in filament position, alignment, and composition, leading to inconsistent data.
Innovation Solution
A method and apparatus that determine and store performance characteristics of multiple electron emitters, allowing for seamless switching between them by normalizing the performance of the second emitter relative to the first, using stored information to adjust operating parameters such as duty cycle, emission current, or electron lens voltage to maintain consistent ion intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filaments are used to continue operation when one burns out, then reliability is improved, but manufacturing precision deteriorates because no two filaments are exactly the same and produce different ion intensities
Solution Approach 1:
The system performs preliminary characterization of each filament's performance characteristics (ion intensity, mass spectral data) during manufacturing or initial operation. This stored baseline data is then used to automatically adjust operating parameters when switching between filaments, eliminating the need for manual recalibration and maintaining consistent data quality across filament transitions.
Solution Approach 2:
The system dynamically adjusts operating parameters such as filament current, duty cycle, or electron multiplier voltage based on the specific filament in use. By changing these parameters in real-time according to each filament's characteristics, the system compensates for manufacturing variations and maintains consistent ion intensity and data quality across all filaments.
2Measurement precision
If recalibration is performed when switching filaments to ensure accurate data, then measurement precision is improved, but loss of time worsens due to time-consuming recalibration and sample scrap
Solution Approach 1:
Performance characteristics and calibration data for each filament are determined and stored in advance during manufacturing or initial setup. When a filament is switched, the system automatically retrieves the pre-stored characterization data for that specific filament and applies the appropriate parameters, eliminating the need for time-consuming manual recalibration during operation.
Solution Approach 2:
The system performs automatic self-calibration by retrieving stored performance characteristics for the active filament and automatically adjusting operating parameters based on that data. This automated process eliminates manual intervention, reduces recalibration time from minutes to seconds, and allows continuous operation without sample scrap.
3Measurement precision
If filament performance variations are accommodated by manual recalibration, then measurement precision is improved, but ease of operation deteriorates due to operational complexity
Solution Approach 1:
The system automatically manages filament performance variations through self-calibration. When a filament is switched, the controller automatically retrieves the stored performance characteristics for that filament and adjusts operating parameters without operator intervention. This eliminates complex manual recalibration procedures while maintaining consistent data quality, significantly improving ease of operation.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor actual ion intensity and performance metrics during operation. Based on this feedback and the stored performance characteristics, the controller automatically adjusts parameters to maintain optimal performance, eliminating the need for manual monitoring and adjustment by the operator.
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 continuous operation with minimal disruption by automatically adjusting parameters to maintain accurate and consistent data production when switching filaments, potentially reducing downtime to just a few seconds.
Implementation Method 1
The electron source includes a filament that is energized to emit electrons for the stream
Data Source
AI summary
A method for operating a mass spectrometer includes determining a first performance characteristic while operating the mass spectrometer with a first electron emitter, storing first information relating to the first performance characteristic, determining a second performance characteristic while operating the mass spectrometer with a second electron emitter, storing second information relating to the second performance characteristic, and thereafter switching from operation using the first electron emitter to operation using the second electron emitter. The switching includes using the first and second information to normalize performance of the second electron emitter after the switching relative to performance of the first electron emitter before the switching.