Quadrupole Mass Spectrometer Dynamic Voltage Adjustment
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Solution Overview
Problem
The stability and performance of quadrupole mass spectrometers are compromised due to non-optimum voltage settings for ion lens electrodes, leading to unstable detection sensitivity and frequent re-adjustments, as well as contamination from sample components and carrier gas, resulting in inconsistent mass spectrum patterns.
Innovation Solution
A quadrupole mass spectrometer with a voltage adjustment unit that adjusts the gain and electric field state in the detection unit and ion transport system to match the spectrum pattern of a target mass spectrum, using a control unit to compare measured and standard spectra and adjust voltages accordingly, minimizing electrode contamination and maintaining performance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the voltage applied to the lens electrode is adjusted to match spectrum patterns, then compound identification accuracy is improved, but detection sensitivity becomes unstable and requires frequent re-adjustment
Solution Approach 1:
The patent changes the voltage parameter of the lens electrode dynamically based on the mass-to-charge ratio range being scanned. By adjusting the voltage in synchronization with the mass scan, the system maintains optimal ion introduction efficiency across different mass ranges, achieving both accurate spectrum patterns and stable detection sensitivity without frequent re-adjustments
Solution Approach 2:
The system transitions from a static voltage setting to a dynamic voltage adjustment mechanism that automatically adapts to different mass-to-charge ratio ranges. The voltage applied to the lens electrode is continuously modified during the mass scan process, enabling the system to maintain optimal performance across varying operating conditions without manual intervention
2Productivity
If the lens electrode voltage is optimized for ion introduction efficiency, then detection sensitivity is improved, but spectrum pattern consistency deteriorates due to mass-to-charge ratio dependent convergence changes
Solution Approach 1:
The voltage applied to the lens electrode is made dynamic rather than fixed. The system automatically adjusts the voltage in synchronization with the mass scan, modifying the convergence characteristics of the ion lens to match the current mass-to-charge ratio range. This dynamic adaptation maintains both high ion introduction efficiency and consistent spectrum patterns across different mass ranges
Solution Approach 2:
The patent implements systematic changes to the lens electrode voltage parameter based on the operating conditions. By coordinating voltage adjustments with the mass scan progression, the system optimizes ion convergence for each mass range while maintaining reproducible spectrum patterns, resolving the contradiction between efficiency and consistency
3Measurement precision
If the mass spectrometer operates at high sensitivity, then compound detection capability is improved, but electrode contamination increases requiring frequent maintenance
Solution Approach 1:
The patent applies preliminary cleaning action by introducing a cleaning gas (such as oxygen or nitrogen) to the ion source before actual sample analysis. This preliminary treatment burns off or removes organic contaminants that would otherwise accumulate on the lens electrode during high-sensitivity operation, extending maintenance intervals while maintaining detection capability
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 ensures stable performance and improved measurement efficiency by maintaining accurate spectrum pattern matching, reducing the need for frequent adjustments and minimizing electrode contamination, thereby enhancing compound identification accuracy.
Implementation Method 1
a quadrupole mass filter as a mass separator... separate ions to be measured according to a mass-to-charge ratio
Implementation Method 2
the voltage applied to the lens electrode constituting the ion lens disposed between the ion source and the quadrupole mass filter
Implementation Method 3
a detection unit configured to detect ions having passed through the quadrupole mass filter
Data Source
AI summary
Measurement of a standard sample is repeated under control of an analysis control unit (94) while a CD voltage applied to a conversion dynode (61) of a detection unit (6) is gradually changed by a CD voltage adjustment unit (96). Then, every time a measured mass spectrum is obtained, a spectrum pattern determination unit (93) determines whether a pattern of the measured mass spectrum matches a pattern of a standard mass spectrum of a standard sample in a compound database (92), and determines the CD voltage at the time of being regarded as matching to be the set value. When the pattern of the mass spectrum is adjusted by changing the voltage applied to the ion lens (3), performance such as sensitivity is likely to be unstable due to stain on the lens electrode or the like, but since the detection unit (6) is unlikely to be affected by such a stain, unstable performance can be avoided.