Precessing Electron Beam for Accurate Chemical Analysis
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Solution Overview
Problem
Existing electron microscopy methods face inaccuracies in chemical and crystallographic analysis due to object movement or change during analysis, particularly in analyzing phase-change materials and components with structural or thermal displacements.
Innovation Solution
A method involving the emission of a precessing electron beam with simultaneous acquisition of electron diffraction patterns and X-ray intensity values, allowing for accurate determination of chemical composition and crystalline structure, even when the object is moving or changing, by using a precessional motion with a controlled angle and frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a stationary electron beam is used for analysis, then the analysis method is simple, but the analysis accuracy deteriorates when the object moves or changes during analysis
Solution Approach 1:
The electron beam is transformed from a stationary state to a dynamic precessing state, where it rotates around the optical axis while maintaining its focus on the sample. This dynamic configuration allows the beam to continuously sample different angular positions, effectively tracking and analyzing moving or changing objects with improved accuracy while maintaining methodological simplicity.
Solution Approach 2:
The electron beam performs periodic precessional motion around the optical axis at a controlled frequency. This periodic action ensures that the beam systematically covers all angular positions around the focal point, enabling complete spatial sampling of the object regardless of its movement or changes during analysis, thereby maintaining high measurement precision.
2Productivity
If the electron beam is focused on a single point, then the analysis is quick, but the analysis reliability deteriorates due to object displacement
Solution Approach 1:
Instead of maintaining a fixed focal point, the electron beam dynamically precesses around the optical axis while remaining focused on the sample region. This dynamic focusing approach allows the beam to continuously track the object of interest even when it moves or changes, maintaining both analysis speed and reliability by keeping the focal region centered on the moving target.
3Device complexity
If sequential acquisition of diffraction pattern and X-ray spectrum is performed, then the equipment requirement is simple, but the measurement precision deteriorates due to object change between measurements
Solution Approach 1:
The acquisition of electron diffraction patterns and X-ray spectral data is merged into a simultaneous process. Both types of data are collected at the same time while the electron beam precesses around the optical axis, ensuring that the object remains in the same state during both measurements. This eliminates timing discrepancies caused by object movement or changes, significantly improving measurement precision without requiring complex additional equipment.
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 provides a more accurate chemical and crystallographic analysis by synchronizing the precessional motion with data acquisition, reducing the impact of object displacement or change, and enhancing the precision of chemical composition and crystalline phase determination.
Implementation Method 1
the acquisition, at least partly simultaneous, of an electron diffraction pattern
Implementation Method 2
the acquisition, at least partly simultaneous, of intensity values of X rays
Data Source
AI summary
The present disclosure concerns an electron microscopy method, including the emission of a precessing electron beam and the acquisition, at least partly simultaneous, of an electron diffraction pattern and of intensity values of X rays.