Mass Spectrometer Calibration Across Variable Scan Speeds
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Solution Overview
Problem
Existing mass spectrometer calibration methods fail to account for scan speed variations, leading to inaccuracies when calibrating experimental data obtained at different scan speeds from the calibration data, necessitating the same scan speed for both calibration and experimentation, which is impractical for conducting multiple experiments in a single day.
Innovation Solution
The method involves experimentally determining mass-to-charge ratios of chemical compounds at multiple scan speeds, interpolating these ratios for different scan speeds, and constructing a calibration curve using probabilistic methods to enable accurate calibration across various scan speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If calibration is performed at a single scan speed, then calibration time is reduced, but mass accuracy deteriorates when experiments are conducted at different scan speeds
Solution Approach 1:
The patent applies parameter changes by measuring mass-to-charge ratios at multiple scan speeds (first and second scan speeds) and then interpolating to determine ratios at intermediate scan speeds. This transforms the calibration approach from a single-speed measurement to a multi-speed measurement with mathematical interpolation, allowing accurate calibration curves to be generated for any scan speed within the measured range without performing actual calibration experiments at each speed.
Solution Approach 2:
The patent implements preliminary action by conducting calibration measurements at multiple scan speeds in advance and storing the data. When calibration is needed at any intermediate scan speed, the system retrieves and interpolates from the pre-collected data rather than performing new measurements, significantly reducing calibration time while maintaining accuracy.
2Measurement precision
If calibration is performed at multiple scan speeds, then mass accuracy is maintained across different scan speeds, but calibration time and complexity increase
Solution Approach 1:
The patent applies partial action by measuring at a limited number of discrete scan speeds (first and second scan speeds) that are sufficient to cover the required range through interpolation. This avoids the excessive action of measuring at every possible scan speed, achieving adequate coverage with minimal measurements while maintaining accuracy across the full range.
Solution Approach 2:
The patent uses copying by creating a mathematical model (calibration curve) from measurements at discrete scan speeds that can then be replicated for any intermediate scan speed through interpolation. The measured data at specific speeds serves as a template that generates calibration information for all speeds within the range without requiring direct measurement at each speed.
3Measurement precision
If the same scan speed is used for both calibration and experimentation, then mass accuracy is maintained, but operational flexibility and productivity are reduced
Solution Approach 1:
The patent implements universality by creating a calibration system that works across multiple scan speeds using a single set of calibration measurements. The interpolated calibration curve provides universal applicability, allowing the mass spectrometer to operate at any scan speed within the calibrated range while maintaining mass accuracy, thus enabling both calibration and experimentation to be performed at different speeds as needed.
Solution Approach 2:
The patent applies dynamics by making the calibration system adaptable to different scan speeds through mathematical interpolation. Rather than being fixed to a single calibration speed, the system dynamically generates appropriate calibration curves for any requested scan speed based on the stored multi-speed measurement data, providing flexibility in operational parameters.
Data Source
AI summary
Methods of calibrating a mass spectrometer include: experimentally determining the mass to charge ratios of a plurality of chemical compounds in a reference standard using a mass spectrometer configured to scan ions at a first scan speed; experimentally determining the mass to charge ratios of said plurality of chemical compounds in said reference standard using a mass spectrometer configured to scan ions at a second scan speed; generating sets of data corresponding to each chemical compound, each set of data comprising the experimentally determined mass to charge ratios and the first and second scan speeds; interpolating from the sets of data mass to charge ratio for each chemical compound at a scan speed different from the first and second scan speeds; and constructing a calibration curve using the mass to charge ratios interpolated from the sets of data.