Mass Spectrometer Control for Early Invalid Peak Detection
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Solution Overview
Problem
Isotope ratio mass spectrometry systems face challenges in identifying invalid measurements, leading to wastage of valuable samples and carrier gases due to the closed nature of the system, making it difficult for operators to detect errors until significant resources have been consumed.
Innovation Solution
A method for controlling a mass spectrometer that involves supplying a test specimen and measuring ion intensity, with criteria for validity including the detection of a valid peak within a predetermined time interval and the presence of a user-specified flag, allowing for automatic termination of invalid measurements to prevent wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IRMS system operates in a closed nature without continuous monitoring, then the system can maintain stable measurement conditions, but errors cannot be detected until significant sample and carrier gas wastage has occurred
Solution Approach 1:
The patent applies preliminary action by implementing validity checks at the beginning of each measurement cycle. The system evaluates multiple validity criteria (peak detection, signal-to-noise ratio, integration quality) before committing to a full measurement, thereby preventing invalid measurements from consuming valuable samples and carrier gas.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring measurement parameters and providing real-time validity assessment. The system uses feedback from peak detection algorithms and signal quality metrics to determine whether to continue or terminate measurements, enabling operators to detect errors promptly without significant resource wastage.
2Loss of substance
If the system requires continuous operator monitoring to detect measurement errors, then resource wastage can be minimized, but operational complexity and operator workload increase significantly
Solution Approach 1:
The patent applies self-service by enabling the system to automatically monitor its own measurement validity without requiring continuous operator intervention. The embedded software performs real-time validity checks on multiple parameters (peak detection, signal quality, integration accuracy) and autonomously identifies invalid measurements, freeing operators from manual monitoring while minimizing resource wastage.
Solution Approach 2:
The system provides automated feedback through validity flags and status indicators that inform operators of measurement issues without requiring constant attention. This feedback mechanism maintains ease of operation by presenting information in a manageable format while effectively reducing resource wastage through automatic detection.
3Measurement precision
If multiple validity criteria are implemented for real-time measurement validation, then measurement accuracy can be ensured, but system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the validity assessment into distinct, modular criteria: peak detection validity, signal-to-noise ratio validation, integration quality assessment, and timing criterion verification. Each criterion operates independently and can be evaluated separately, managing system complexity through structured decomposition while ensuring comprehensive measurement precision.
Solution Approach 2:
The patent replaces complex mechanical monitoring systems with software-based validation algorithms. The use of computational methods for peak detection, signal analysis, and validity assessment reduces physical system complexity while maintaining or enhancing measurement precision through flexible, programmable validation criteria.
Data Source
AI summary
A method for controlling a mass spectrometer comprising a mass analyser and a detector. A test specimen is supplied into the mass analyser, to travel through the mass analyser and towards the detector, the test specimen comprising a carrier gas and/or analyte ions, the test specimen being one of a series of test specimens to be analysed. An ion intensity is measured, the ion intensity representing the intensity of ions within the test specimen received at the detector. The method determines if at least one validity criterion of a group of validity criteria is complied with, the group of validity criteria including: identification of a valid peak in the ion intensity measured within a predetermined time interval; and identification of a user-specified flag associated with the predetermined time interval. If none of the validity criteria are complied with, then terminating supplying into the mass analyser the test specimen and any further test specimen of the series of test specimens. A controller configured to carry out the method, and a mass spectrometer are also disclosed.