Ion Detector Dynamic Range Extension via Baseline Segmentation
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Solution Overview
Problem
Existing mass spectrometry techniques struggle to differentiate between actual ion signals and electronic baseline signals when applying extended dynamic range, leading to false peaks that can be misinterpreted as real ion signals, limiting the instrument's sensitivity and dynamic range.
Innovation Solution
The method involves measuring and separating the electronic baseline signal from actual ion signals by setting a threshold value above the average baseline signal, excluding signals below this threshold from compensation adjustments, and applying a compensation factor only to signals above the threshold to minimize false peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same compensation factor is applied to all signals (ion signals and baseline signal) to extend dynamic range, then the dynamic range of the ion detector is improved, but false peaks appear in the mass spectrum due to multiplication of the baseline signal
Solution Approach 1:
The patent segments the signal processing by separating ion signals from baseline signals. The method determines a baseline signal level and applies the compensation factor selectively only to signals exceeding this baseline, rather than uniformly to all signals. This segmentation resolves the contradiction by enabling dynamic range extension for ion signals while preventing false peak generation from baseline signal multiplication.
Solution Approach 2:
The patent applies local quality by making the compensation factor application location-specific and signal-type-specific. Instead of a global uniform application, the compensation is applied locally only to signals that exceed the determined baseline level. This localized approach allows dynamic range improvement where needed (for ion signals) while avoiding harm where not needed (baseline signals).
2Adaptability or versatility
If the multiplier voltage is decreased for high ion signals to prevent saturation, then the dynamic range is extended, but the compensation factor must be increased which amplifies the baseline signal and creates false peaks
Solution Approach 1:
The patent extracts the baseline signal component from the total signal and sets it as a reference threshold. By taking out the baseline signal characteristics and using them to define a threshold, the method enables selective processing where only signals above this extracted baseline level receive compensation factor multiplication. This extraction approach prevents false peaks while maintaining dynamic range extension benefits.
Solution Approach 2:
The patent performs preliminary action by determining the baseline signal level before applying compensation factors to ion signals. This preliminary characterization of the baseline allows the system to anticipate which signals should receive compensation and which should not, preventing false peak generation before it occurs. The baseline determination is performed in advance to guide subsequent signal processing decisions.
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 effectively reduces false peaks in mass spectrometry spectra, allowing for accurate identification of sample constituents and improved sensitivity by maintaining the baseline signal unchanged during dynamic range extension.
Implementation Method 1
the ion detector includes an electron multiplier stage that applies voltage and thus provides gain to the output electrical signal of the ion detector
Data Source
AI summary
Embodiments of the present disclosure provide methods of controlling an ion detector to minimize false peaks when utilizing extended dynamic range techniques. In one exemplary example, methods of controlling an ion detector are provided, comprising the steps of: determining an electronic baseline signal of the ion detector; receiving one or more ion input signals at the ion detector; comparing the ion input signal to the electronic baseline signal; and multiplying the ion input signal by a selected compensation factor when the ion input signal exceeds the electronic baseline signal.