Multi-Channel Mass Spectrometry Data Acquisition for Dynamic Range
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Solution Overview
Problem
Current data acquisition systems for mass spectrometers face challenges in achieving high dynamic range and efficient data processing, particularly in Time-of-Flight (TOF) mass spectrometry, due to detector saturation and the need for complex and costly solutions to handle varying ion currents and high data rates.
Innovation Solution
A data acquisition system utilizing two or more detectors with separate channels for outputting detection signals, which are processed independently to remove noise using a threshold and then merged to construct a high dynamic range mass spectrum, allowing for flexible and efficient data processing without significant increases in processing speed or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single detector is used with dual amplification levels, then dynamic range is improved, but device complexity and cost increase
Solution Approach 1:
The invention divides the detection function into two separate detectors: a first detector for low-intensity signals and a second detector for high-intensity signals. This segmentation allows each detector to be optimized for its specific signal range, achieving high dynamic range without requiring a single complex detector with dual amplification systems.
Solution Approach 2:
Instead of adding amplification levels within a single detector (vertical dimension), the invention adds a spatial dimension by using multiple detectors in parallel. Each detector operates independently in its own channel, and the signals are merged computationally, transforming the problem from a single-detector multi-gain system to a multi-detector single-gain system.
2Measurement precision
If two or more separate detection systems are used, then dynamic range is improved, but device complexity and cost increase
Solution Approach 1:
The invention merges the outputs of two separate detection channels (first detector and second detector) into a single mass spectrum. The data processing system combines the low-intensity signal data from the first detector with the high-intensity signal data from the second detector, achieving high dynamic range while maintaining relatively simple individual detector designs.
3Measurement precision
If high data sampling rates are used, then measurement precision is improved, but data processing time increases
Solution Approach 1:
The invention performs preliminary noise filtering by applying a threshold to the detection signals before merging them to construct the mass spectrum. This preliminary action removes noise components early in the processing pipeline, reducing the computational burden of subsequent processing steps and decreasing overall data processing time while maintaining high sampling rates.
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 achieves a dynamic range of 10^4-10^5 and enables the identification and quantification of organic compounds, peptides, and proteins with improved sensitivity and reduced data processing time, while maintaining simplicity and cost-effectiveness.
Implementation Method 1
The ions are emitted from a pulsed source in the form of a short packet of ions, and are directed along the fixed flight path through an evacuated region to an ion detector
Implementation Method 2
Time-of-flight (TOF) mass spectrometers determine the mass to charge ratio (m/z) of ions on the basis of their flight time along a fixed flight path
Data Source
AI summary
The invention provides a data acquisition system and method for detecting ions in a mass spectrometer, comprising: a detection system for detecting ions comprising two or more detectors for outputting two or more detection signals in separate channels in response to ions arriving at the detection system; and a data processing system for receiving and processing the detection signals in separate channels of the data processing system and for merging the processed detection signals to construct a mass spectrum; wherein the processing in separate channels comprises removing noise from the detection signals by applying a threshold to the detection signals. The detection signals are preferably produced in response to the same ions, the signals being shifted in time relative to each other. The invention is suitable for a TOF mass spectrometer.