Bidirectional Mass Spectrometer Scanning for Reduced Spectral Skew
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Solution Overview
Problem
Mass spectrometers face challenges with settling time reducing duty cycle and causing spectral skew, especially when connected to chromatographic systems, leading to inaccurate spectral data due to contamination and temporal shifts in mass chromatograms.
Innovation Solution
Implementing a method where at least two scans are performed in opposite directions to mitigate settling time issues and spectral skew, allowing for reduced reset time and distortion, using spectrally significant parameters like fragmentation energy or collision energy, and constructing a compound spectrum from these scans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning parameters are varied to generate spectral data, then spectral quality and analysis accuracy are improved, but settling time increases and duty cycle decreases
Solution Approach 1:
The patent applies periodic action by implementing bidirectional scanning where the parameter scans from start to stop value, then resets and scans back from stop to start value. This periodic back-and-forth scanning pattern allows the system to maintain higher productivity by reducing idle settling time while still acquiring sufficient spectral data points for accurate analysis. The regular periodic nature of alternating scan directions creates an efficient cycle that maximizes duty cycle.
2Productivity
If faster scan cycle times are used to reduce settling time impact, then productivity is improved, but spectral skew increases and data accuracy deteriorates
Solution Approach 1:
The patent applies inversion by scanning the parameter in the opposite direction after completing a forward scan. Instead of simply resetting to the start value, the system scans back from the stop value to the start value, effectively using the reset period productively. This inverted scanning approach maintains fast scan cycle times while ensuring that spectral points are collected during both the forward and reverse scans, thereby maintaining data accuracy through multiple measurements.
3Measurement precision
If scanning time is extended to improve spectral quality, then measurement precision is improved, but time consumption increases and productivity decreases
Solution Approach 1:
The patent applies continuity of useful action by ensuring that both the forward scan (start to stop) and reverse scan (stop to start) are productive measurement periods. Unlike traditional methods where reset time is wasted, this approach continuously collects spectral data throughout the entire scanning cycle. The useful action of data acquisition continues uninterrupted during both scan directions, maximizing the information gained per unit time and improving productivity without sacrificing spectral quality.
Data Source
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AI summary
A method of generating spectral data comprising the steps of deriving a temporally separated sample from a temporal separation device and subjecting the temporally separated sample to an analysis involving scanning at least one spectrally significant parameter, wherein the analysis is performed so that at least two scans in succession are in opposite directions.