Charged-Particle Detector Calibration via Photon Source
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Solution Overview
Problem
Mass spectrometers face challenges in maintaining spectral resolution and mass accuracy due to ions of the same mass having different kinetic energies and being accelerated from different points in space, leading to degradation of spectral resolution and loss of mass accuracy.
Innovation Solution
A method for testing and adjusting ion detectors using a photon source, such as a Light-Emitting Diode (LED), to determine and adjust the signal gain, and to confirm proper functioning by varying the current and measuring responses without ionizing events, allowing for calibration and diagnostics independent of normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ions are accelerated from different points in space with different kinetic energies, then the ion beam can be formed and transmitted, but spectral resolution and mass accuracy deteriorate
Solution Approach 1:
The patent applies preliminary action by implementing a delay period between laser ionization and the application of the accelerating electric field. During this delay, ions with different kinetic energies and spatial distributions are allowed to evolve, and then a uniform accelerating pulse is applied to all ions simultaneously. This transforms the initial energy distribution into a spatial distribution, ensuring that all ions experience the same acceleration conditions, thereby improving spectral resolution and mass accuracy while maintaining ion beam transmission
2Measurement precision
If Delayed Extraction is implemented to improve spectral resolution, then mass accuracy improves, but the complexity of the ion source control increases
Solution Approach 1:
The patent implements periodic action through the Delayed Extraction technique, where a short time delay is introduced between the laser ionization pulse and the accelerating electric field pulse. This periodic timing sequence allows ions to spatially separate based on their initial kinetic energies before the uniform accelerating field is applied, thereby improving spectral resolution without requiring complex additional hardware, only precise temporal control of the electric field switching
3Measurement precision
If signal gain of the ion detector is adjusted to match reference values, then detection accuracy improves, but the time required for calibration and diagnostics increases
Solution Approach 1:
The patent applies self-service by implementing automated calibration and diagnostic routines where the system independently measures its own detector signal gain using reference ions of known mass-to-charge ratios, compares the measured values against predetermined reference values, and automatically adjusts the detector gain settings without requiring manual intervention. This self-calibrating capability improves detection accuracy while minimizing calibration time by eliminating manual adjustment steps
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 enables effective calibration and diagnostics of ion detectors, ensuring accurate mass spectrometry by confirming detector functionality and adjusting signal gain, thereby improving spectral resolution and mass accuracy.
Implementation Method 1
providing, from a photon source, photons incident on the charged-particle detector
Implementation Method 2
detecting a response by the charged-particle detector to the photons incident thereon
Data Source
AI summary
Methods for testing or adjusting a charged-particle detector are provided. A diagnostic and/or adjustment method for a charged-particle detector of an instrument includes providing, from a photon source, photons incident on the charged-particle detector. Moreover, the method includes detecting a response by the charged-particle detector to the photons incident thereon. Related detection systems are also provided.