Collision Cell Ion Accumulation Control for Signal Saturation
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Solution Overview
Problem
Signal saturation and sensitivity insufficiency occur in mass spectrometry apparatuses with collision cells due to inappropriate ion accumulation times, leading to inefficiencies in detection.
Innovation Solution
A mass spectrometry apparatus and method that includes a collision cell with alternate accumulation and ejection, using a detector to evaluate ion accumulation time based on detection signal intensity, and adjusting the time to prevent saturation and insufficiency through automatic or user-controlled corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ion accumulation time is increased, then the detection sensitivity is improved, but signal saturation occurs
Solution Approach 1:
The patent applies dynamics by making the ion accumulation time variable rather than fixed. The system dynamically adjusts the accumulation time based on real-time detection signal intensity, allowing the parameter to adapt between short and long durations depending on the current ion signal strength, thus preventing both saturation and sensitivity loss
Solution Approach 2:
The patent implements feedback control where the detection signal intensity is continuously monitored and used to adjust the ion accumulation time. The evaluation unit receives detection results and feeds this information back to the control unit, which then modifies the accumulation time accordingly, creating a closed-loop control system that prevents signal saturation while maintaining sensitivity
2Object-generated harmful factors
If the ion accumulation time is decreased, then signal saturation is prevented, but detection sensitivity becomes insufficient
Solution Approach 1:
The system dynamically adjusts accumulation time based on real-time signal conditions. When signal intensity is low, the accumulation time is extended to improve sensitivity; when signal intensity is high, the time is reduced to prevent saturation, making the system adaptable to varying detection conditions
Solution Approach 2:
The evaluation unit continuously monitors detection signal intensity and provides feedback to the control unit. Based on this feedback, the control unit adjusts the accumulation time to ensure optimal sensitivity while preventing saturation, creating a self-regulating system
3Ease of operation
If a fixed ion accumulation time is used, then device operation is simplified, but both signal saturation and sensitivity insufficiency cannot be simultaneously prevented
Solution Approach 1:
The system performs self-adjustment of the ion accumulation time based on its own detection results. The evaluation unit analyzes the detection signal intensity and the control unit automatically modifies the accumulation time without requiring external intervention, enabling the system to optimize its own operation for different detection conditions
Solution Approach 2:
Rather than using a fixed accumulation time, the system dynamically adapts the parameter based on real-time detection conditions. This dynamic adjustment allows the system to maintain high reliability across varying signal intensities while keeping the operation interface simple through automated control
Data Source
AI summary
Ions ejected from a collision cell are detected by a detector. An evaluation unit generates a temporary calibration curve based on an intensity of a detection signal and evaluates an ion accumulation time of the collision cell based on the temporary calibration curve. When the evaluation unit determines signal saturation, the ion accumulation time of the collision cell is reduced. When the evaluation unit determines sensitivity insufficiency, the ion accumulation time of the collision cell is increased.