Ion Analysis Device Droplet Feedback Control
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Solution Overview
Problem
Conventional ion analysis devices face challenges in adjusting apparatus conditions for optimal ionization efficiency due to contamination from impurities in droplets, leading to reduced sensitivity and increased measurement time, especially when ionic strength is low and droplet amounts are large, necessitating frequent calibrator sample measurements and potential sample waste.
Innovation Solution
An ion analysis device with an ion source, ion guide having separate outlets for ions and droplets, a droplet measurement unit, and an analysis control section that monitors and adjusts the amount of droplets to prevent contamination and maintain sensitivity, using the droplet measurement unit to control the flow rate and temperature of the heated gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flow rate of heated gas is increased to accelerate solvent vaporization and improve ionization efficiency, then the vaporization efficiency is improved, but the liquid sample may boil causing unstable ionic strength
Solution Approach 1:
The patent implements a feedback control system where a droplet measurement unit monitors the amount of droplets in real-time, and the analysis control section adjusts the heated gas flow rate and temperature based on this feedback to maintain stable ionic strength while ensuring adequate vaporization efficiency
Solution Approach 2:
The system uses the measured droplet amount information to automatically self-adjust the heated gas conditions, eliminating the need for manual intervention and enabling the system to maintain optimal conditions dynamically
2Reliability
If the heated gas temperature is increased to improve solvent vaporization, then the vaporization efficiency is improved, but contamination from impurities increases leading to reduced sensitivity
Solution Approach 1:
The droplet measurement unit provides real-time feedback on droplet amounts, enabling the analysis control section to adjust heated gas temperature dynamically - increasing temperature when vaporization is insufficient and decreasing it when contamination risk increases, thus maintaining optimal balance between vaporization efficiency and contamination control
Solution Approach 2:
The system transitions from static heated gas conditions to dynamic adjustment based on real-time droplet measurements, allowing the temperature to be optimized continuously according to actual vaporization needs and contamination risks
3Measurement precision
If manual adjustment of apparatus conditions is performed to optimize ionization, then measurement precision is improved, but adjustment time and measurement time increase
Solution Approach 1:
The system automatically monitors droplet amounts and adjusts heated gas conditions without manual intervention, enabling continuous optimization of ionization efficiency while eliminating time-consuming manual adjustment procedures
Solution Approach 2:
The automated monitoring and adjustment system operates continuously during sample measurement, ensuring optimal conditions are maintained throughout the analysis rather than requiring periodic manual interventions
4Measurement precision
If frequent calibrator sample measurements are performed to monitor sensitivity, then measurement precision is maintained, but productivity decreases and sample waste increases
Solution Approach 1:
The droplet measurement unit provides continuous feedback on ionization conditions, replacing the need for frequent calibrator measurements with real-time monitoring that detects changes in droplet amounts indicating sensitivity variations
Solution Approach 2:
The patent replaces the mechanical approach of frequent calibrator injections with an electronic/optical monitoring system that measures droplet amounts non-invasively, eliminating sample consumption for sensitivity checks
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 configuration reduces adjustment time and contamination, allowing for real-time monitoring of sensitivity during sample measurement, decreasing the need for repeated calibrator samples and minimizing waste and measurement time, while maintaining high sensitivity.
Implementation Method 1
In Electrospray ionization (ESI), a liquid sample is passed through a small tube and high voltage is applied to an outlet of the small tube. The liquid sample is electrically charged at the high voltage, so that the liquid sample at the outlet of the small tube is atomized in a mist form due to electric repulsion to produce charged droplets.
Implementation Method 2
The solvent in the sprayed charged droplets is volatilized, so that the analyte in the droplets is ionized. The heated gas accelerates vaporization of the solvent.
Implementation Method 3
The ions produced by the ion source pass, together with ambient gas, through a vacuum chamber entrance to enter the ion guide because of a pressure difference between the ion source and the ion guide. The airflow containing the ions is adiabatically expanded to be accelerated to hypersonic speeds, and travels in straight line within the ion guide.
Data Source
AI summary
An ion analysis device includes: an ion source that ionizes an analyte in a liquid sample; an ion guide into which droplets and ions produced in the ion source are introduced, the ion guide having different outlets, one outlet being an ion outlet for the ions and the other outlet being a droplet outlet for the droplets; an ion analysis unit that analyzes ions ejected from the ion outlet; a droplet measurement unit that is placed on an axis of the droplet outlet, and measures the amount of droplets; and an analysis control section that compares the amount of droplets measured at the droplet measurement unit with a threshold.