Mass Analyser Voltage Divider for Drift-Compensated Accuracy
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Solution Overview
Problem
Commercial high-resolution mass analyzers face challenges in achieving accurate mass measurements due to power supply jitter and drift, which affect the stability and accuracy of voltage supplies, leading to impaired resolution and mass accuracy.
Innovation Solution
A voltage supply system for mass analyzers is designed with a voltage divider network comprising resistors with specific temperature and ageing coefficients to compensate for mass shifts caused by voltage perturbations, ensuring stability and accuracy by balancing the effects of temperature variations and resistor ageing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional low pass filters are used to remove higher frequency ripple, then power supply jitter is reduced, but additional resistors and high voltage capacitors are required, increasing device complexity and power consumption
Solution Approach 1:
The patent changes the parameter of resistor temperature coefficient from a fixed value to a specifically selected value that compensates for mass shifts. By selecting resistors with appropriate temperature coefficients, the system achieves both jitter reduction and drift compensation without requiring complex filter networks, thus resolving the contradiction between reliability and device complexity.
2Measurement precision
If temperature control is applied to the entire power supply or instrument, then mass measurement accuracy is improved, but power consumption and system complexity increase
Solution Approach 1:
Instead of controlling temperature actively, the patent changes the parameter of resistor temperature coefficients to achieve passive compensation. By selecting resistors whose temperature-dependent resistance changes produce opposing mass shifts, the system compensates for temperature drift without requiring power-consuming temperature control mechanisms, thus resolving the contradiction between measurement precision and power consumption.
3Stability of the object's composition
If resistors with low temperature coefficients are used to minimize drift, then voltage stability is improved, but mass shift compensation becomes more difficult
Solution Approach 1:
The patent optimizes the parameter of resistor temperature coefficients by selecting specific values that simultaneously achieve voltage stability and mass shift compensation. Rather than minimizing temperature coefficient alone, the system selects coefficients that create opposing mass shifts between electrodes, resolving the contradiction between voltage stability and measurement precision.
4Measurement precision
If multiple electrodes with opposing mass shift characteristics are used, then mass shift compensation is achieved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different temperature coefficient characteristics to different resistors connected to different electrodes. Each electrode-resistor pair is locally optimized with specific temperature coefficients that create opposing mass shifts, enabling compensation while maintaining a relatively simple overall device structure.
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
The solution effectively reduces overall mass shifts per degree Kelvin and per week, enhancing the stability and accuracy of mass measurements by compensating for both temperature-induced and ageing-related drifts, thereby improving the resolution and reliability of mass analyzers.
Implementation Method 1
The first resistor has a first temperature coefficient. The second resistor has a second temperature coefficient. The second temperature coefficient is selected based on the first and second mass shift per volt perturbations and the first temperature coefficient such that a first mass shift associated with the first electrode is compensated by a second mass shift associated with the second electrode.
Implementation Method 2
The first resistor has a first ageing coefficient. The second resistor has a second ageing coefficient. The second ageing coefficient is selected based on the first and second mass shift per volt perturbations and the first ageing coefficient such that a first mass shift associated with the first electrode is compensated by a second mass shift associated with the second electrode.
Data Source
AI summary
A voltage supply for a mass analyser is provided. The voltage supply comprises a voltage source, a first voltage output, a second voltage output, and a voltage divider network. The first voltage output is configured to provide a first voltage to a first electrode of the mass analyser, wherein the first electrode of the mass analyser has a first mass shift per volt perturbation. The second voltage output is configured to provide a second voltage to a second electrode of the mass analyser, wherein the second electrode of the mass analyser has a second mass shift per volt perturbation. The second mass shift per volt perturbation opposes the first mass shift per volt perturbation. The voltage divider network comprises a first resistor and a second resistor.