Quadrupole Gas Analysis Pressure Control for Overlapping Mass Signals
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Solution Overview
Problem
Quadrupole mass spectrometers face challenges in conducting accurate quantitative analysis of substances with similar or near-similar mass numbers due to overlapping detection signals, which obstruct the analysis process.
Innovation Solution
A gas analysis device with a pressure control mechanism that adjusts the pressure in the measurement space to ensure the energy given to the substances falls within specific ionization energy ranges, minimizing interference from substances with similar mass numbers by controlling the ionization energy of the object substance not to be measured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional quadrupole mass spectrometry is used to analyze mixed gas, then the detection unit can detect the object substance, but the detection signal of the object substance is overlapped with the detection signal of substances with similar mass numbers, making quantitative analysis difficult
Solution Approach 1:
The invention changes the pressure parameter in the measurement space to control the ionization energy distribution. By adjusting pressure, the ionization energy given to different substances changes, allowing selective ionization where the object substance is ionized while substances with similar mass numbers are not, thereby resolving signal overlap and improving quantitative analysis accuracy
Solution Approach 2:
The invention uses electron impact ionization where electrons with specific energy distributions (copying the energy profile that matches the ionization energy of the object substance) are introduced to selectively ionize the target substance without ionizing interfering substances, thus achieving signal separation
2Use of energy by moving object
If the pressure in the measurement space is reduced to improve ionization efficiency, then more substances get ionized, but substances with similar mass numbers also get ionized causing signal interference
Solution Approach 1:
Instead of simply reducing pressure to improve ionization efficiency, the invention optimizes pressure to a specific range that provides enough ionization energy for the object substance while preventing ionization of interfering substances. This selective parameter optimization achieves efficient ionization of the target without the harmful side effect of ionizing interferents
Solution Approach 2:
The invention introduces electrons as an intermediary carrier of energy. By controlling the energy distribution of these electrons through pressure adjustment, the system selectively transfers energy to ionize only the object substance, acting as a mediator that prevents direct energy transfer to interfering substances
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 allows for accurate quantitative analysis of the object substance by reducing the detection signal of interfering substances, enabling precise analysis even when substances have similar mass numbers, thereby improving the analytical accuracy of the quadrupole mass spectrometer.
Implementation Method 1
an ionization unit (21), configured to give energy to the object substance to be measured and the object substance not to be measured
Implementation Method 2
a pressure control mechanism (30) that adjusts pressure in the measurement space of the quadrupole mass spectrometer (20)
Implementation Method 3
the detection unit (23) detects the ionized object substance to be measured that passes the quadrupole unit (22)
Data Source
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AI summary
A gas analysis device of this invention is to conduct a quantitative analysis on a mixed gas containing an object substance to be measured and an object substance not to be measured whose mass number is the same or near that of the object substance to be measured by the use of a quadruple mass spectrometer. The gas analysis device comprises a mixed gas generation mechanism that comprises a heating furnace that heats a crucible where a sample is put while introducing a carrier gas to be an object substance not to be measured, generates a sample gas that contains an object substance to be measured by vaporizing at least a part of the sample and discharges a mixed gas comprising the carrier gas and the sample gas, a quadruple mass spectrometer that has a measurement space into which the mixed gas generated by the mixed gas generation mechanism is introduced and that conducts a quantitative analysis on the object substance to be measured by giving energy to the object substance to be measured and the object substance not to be measured in the measurement space, and a pressure control mechanism that adjusts pressure in the measurement space, and the pressure control mechanism adjusts the pressure in the measurement space so as to change the energy that is given to the object substance not to be measured in the measurement space according to the lower limit value of ionization energy of the object substance not to be measured.