TOF Mass Spectrometer Data Acquisition Using Ion Statistics Filtering
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Solution Overview
Problem
Current data acquisition systems for time-of-flight mass spectrometers face challenges in efficiently processing high-rate ion detection signals, often sacrificing sampling rate, mass range, or precision due to limitations in memory and processing capabilities, and struggle to detect both single ions and multiple ions simultaneously with sufficient dynamic range and sensitivity.
Innovation Solution
A data acquisition system that includes an ion detector and processing circuits capable of removing noise, combining adjacent samples, cross-spectra filtering, peak sharpening, and adjusting spectral resolution, while generating stick spectra for post-processing, allowing for independent selection of sampling rate and spectral range, and detecting both single and multiple ions with enhanced sensitivity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data acquisition systems operate at high sampling rates to match TOF spectrometer capabilities, then productivity is improved, but memory requirements and processing complexity increase beyond system capabilities
Solution Approach 1:
The patent segments the high-rate data stream into lower-rate subsets by activating detection circuits only during specific time windows when particular ions are expected to arrive. This divides the continuous high-rate data acquisition into discrete, manageable segments that can be processed with limited memory and computing resources while maintaining high overall productivity.
Solution Approach 2:
The system employs periodic action by turning detection circuits on and off at specific intervals synchronized with ion arrival times. Detection circuits are activated only during predicted arrival windows of specific ions, creating a periodic sampling pattern that reduces data volume while capturing all necessary information at the required effective sampling rate.
2Quantity of substance
If detection circuits are activated only during predicted arrival windows of selected compounds, then data volume is reduced, but measurement precision deteriorates due to missed ions outside windows
Solution Approach 1:
The patent implements multi-functionality by designing a system where multiple detection circuits can be selectively activated for different ion types simultaneously. Each detection circuit is tuned to specific ion arrival windows, allowing the system to handle multiple compounds of interest in parallel while maintaining comprehensive coverage and precision for each.
Solution Approach 2:
The system dynamically adjusts detection circuit activation based on real-time ion arrival predictions. The detection windows and circuit activation timing are optimized to match the specific mass-to-charge ratios and expected arrival times of target ions, ensuring maximum detection precision while minimizing data volume through adaptive, rather than static, sampling.
3Measurement precision
If all ion detection signals are continuously recorded, then measurement precision is maintained, but productivity decreases due to excessive data processing requirements
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing predicted ion arrival times and activation windows for multiple compounds before analysis begins. This advance preparation allows the real-time system to simply activate detection circuits at predetermined intervals without complex real-time calculations, maintaining high spectral resolution while enabling rapid reporting rates.
Solution Approach 2:
The patent introduces an intermediary layer of prediction algorithms and lookup tables that mediate between the high-rate ion detection capability and the lower-rate processing capacity. This intermediary pre-processes ion arrival predictions and generates activation schedules, allowing the main system to operate at high productivity while maintaining precision through the intermediary's preparatory work.
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 system enables faster and more precise data acquisition with improved spectral resolution and ion detection capabilities, allowing for the analysis of full mass ranges at higher reporting rates without compromising precision, and effectively handles both single and multiple ion detections.
Implementation Method 1
TOF mass spectrometers discriminate ions according to their velocity over a fixed distance
Data Source
AI summary
A data acquisition system and method are described that may be used with various spectrometers. The data acquisition system may include an ion detector, an initial processing module, and a spectra processing module. The initial processing module is provided for processing the ion detection signals and for supplying processed signals to the spectra processing module. The spectra processing module generates spectra from the processed signals and supplies the generated spectra to an external processor for post-processing. The spectra processing module may include an ion statistics filter and/or a peak histogram filtering circuit.