Chromatograph Mass Spectrometer SIM Measurement Time Control
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Solution Overview
Problem
Current liquid chromatograph mass spectrometers require manual selection of optimal mass numbers and measurement times for SIM analysis, which is time-consuming and inefficient, especially when dealing with multiple components and varying elution times.
Innovation Solution
Automatically determining measurement time for each peak waveform based on baseline information from chromatogram data, using mass spectral and chromatogram data generated by the ion detection unit, to optimize SIM measurement conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual selection of mass numbers and measurement times is performed for SIM analysis, then measurement precision can be optimized for each component, but the time required for setting measurement conditions increases significantly
Solution Approach 1:
The system performs automatic peak detection and baseline determination to self-determine optimal measurement times for SIM analysis. The control unit automatically processes chromatogram data, detects peaks, determines baselines, and sets measurement time ranges without requiring technician intervention, thereby resolving the contradiction between measurement precision and time consumption.
Solution Approach 2:
The system performs scanning measurement in advance to obtain chromatogram data, which is then used to automatically determine optimal SIM measurement conditions. By performing preliminary scanning and automatic analysis of the data, the system prepares measurement conditions beforehand, eliminating the need for manual setting while maintaining precision.
2Ease of operation
If fixed time length measurement is used for all components, then device operation is simplified, but it cannot adapt to variations in elution time ranges of different components
Solution Approach 1:
The system dynamically determines measurement time ranges for each component based on their actual elution characteristics. Instead of using fixed time lengths, the control unit calculates individualized measurement windows by detecting peak positions and determining baselines for each component, allowing the system to adapt to varying elution times while maintaining ease of operation through automation.
Solution Approach 2:
The system applies different measurement time ranges to different components based on their specific elution characteristics. Each component receives a customized measurement window determined by its own peak shape and baseline, rather than applying a uniform time setting to all components, thereby achieving both simplicity and adaptability.
3Extent of automation
If automatic peak detection and baseline determination are performed, then measurement time determination becomes automated, but data processing complexity increases
Solution Approach 1:
The system replaces manual visual inspection and judgment with automated computational algorithms for peak detection and baseline determination. The control unit uses data processing algorithms to automatically identify peaks and calculate baselines from chromatogram data, substituting human mechanical operations with automated computational processes, thereby achieving automation without proportionally increasing overall system complexity.
Data Source
AI summary
A technician is forced to determine the measurement time to be used in a selected ion monitoring (SIM) measurement while observing mass spectral data. Thus, mass spectral data and one or a plurality of mass chromatogram data items is generated on the basis of the detection results of an ion detection unit, and, for each corresponding ion component, the measurement time to be used in SIM is determined on the basis of the elution time range represented by each peak waveform of the one or plurality of mass chromatogram data items that have been generated.