Capillary Projection Check in Ion Sources Using Current Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ionization methods, such as electrospray ionization (ESI), face challenges with capillary clogging and complex capillary exchange operations, leading to reduced detection sensitivity and potential contamination due to improper positioning of the capillary downstream end, which affects analysis reproducibility and throughput.
Innovation Solution
An ion source and control method that measures the electric current generated by applying voltage to the capillary to determine the proper projection amount of the capillary downstream end, ensuring accurate and efficient positioning without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional ion source is used to analyze volatile organic compounds, then the ion source can operate at atmospheric pressure, but the sensitivity is insufficient due to low ionization efficiency and contamination from high-concentration non-volatile components
Solution Approach 1:
The ion source is divided into two distinct chambers: a first ionization chamber for ionizing volatile organic compounds at atmospheric pressure, and a second ionization chamber operating at reduced pressure for analyzing samples containing non-volatile components. This segmentation allows each chamber to be optimized for its specific function, improving overall sensitivity and preventing contamination.
Solution Approach 2:
A separator is introduced between the two ionization chambers to prevent contamination from high-concentration non-volatile components from reaching the detector. The separator acts as an intermediary that allows ion transmission while blocking harmful contaminants, thereby improving measurement precision without sacrificing ionization efficiency.
2Device complexity
If a single ion source is used for both volatile and non-volatile samples, then the device complexity is low, but the manufacturing precision and reliability deteriorate due to contamination
Solution Approach 1:
The ion source is segmented into two independent chambers with separate ionization conditions, allowing each chamber to be optimized for specific sample types. This segmentation improves manufacturing precision by preventing cross-contamination while maintaining reasonable device complexity through modular design.
Solution Approach 2:
The problematic non-volatile component analysis is extracted to a separate second ionization chamber operating under different conditions. This extraction isolates the contamination source from the volatile organic compound analysis path, improving ion source performance without requiring complete redesign of the entire system.
3Ease of operation
If atmospheric pressure ionization is used, then the ion source is easy to operate, but the ionization efficiency decreases when analyzing samples with high-concentration non-volatile components
Solution Approach 1:
The system dynamically switches between two ionization modes: atmospheric pressure ionization for volatile organic compounds and reduced pressure ionization for non-volatile components. This dynamic adaptation allows the ion source to maintain high ionization efficiency for each sample type while remaining easy to operate through automated mode selection.
Solution Approach 2:
The operating parameters of the ion source are changed based on sample type: atmospheric pressure for volatile compounds and reduced pressure for non-volatile components. This parameter change optimizes ionization efficiency for each case while maintaining ease of operation through automated parameter adjustment.
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 improves the reproducibility of capillary tip end position, minimizing analysis downtime and preventing contamination, thus ensuring high analysis stability and efficiency.
Implementation Method 1
a first ionization chamber that ionizes volatile organic compounds to be analyzed at atmospheric pressure
Implementation Method 2
a second ionization chamber that ionizes volatile organic compounds to be analyzed at reduced pressure
Implementation Method 3
a separator that prevents contamination from high-concentration non-volatile components from reaching a detector
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There are provided an ion source that can accurately and efficiently grasp whether a tip end position on a capillary downstream side is proper and a control method therefor. An ion source according to an embodiment of the present invention measures an electric current generated due to the application of a voltage to a capillary by a power supply when a sample is not introduced into the capillary. When the electric current is within tolerance, the ion source outputs projection amount information expressing that the projection amount of the capillary is proper, and the ion source outputs the projection amount information expressing that the projection amount is improper when the projection amount is not within the tolerance.