Particle Beam Microscope Double Deflector Focusing Method
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Solution Overview
Problem
Current methods for focusing particle beams in particle beam microscopes are time-consuming and demand significant user expertise, and automated methods with a small number of recorded images may not consistently produce optimal results in terms of image sharpness and quality.
Innovation Solution
A method involving a particle beam microscope with a double deflector and objective lens, where the beam's orientation is changed to record multiple particle-microscopic data sets, allowing for analysis to determine optimal focusing settings, such as distance and excitation, to achieve sharper images with reduced astigmatism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual focusing adjustment is performed by operating actuating elements, then the particle beam can be focused to achieve high spatial resolution, but the procedure becomes time-consuming and demands significant user expertise
Solution Approach 1:
The system performs automatic focusing by analyzing recorded images and calculating optimal parameter settings without requiring manual user intervention. The controller automatically adjusts the objective lens excitation and stigmator settings based on image quality analysis, enabling the microscope to focus itself rather than requiring operator skill and time for manual adjustment
Solution Approach 2:
The system records multiple images at different parameter settings, analyzes the image quality (sharpness, astigmatism), and uses this feedback to calculate and determine the optimal focusing parameters. This closed-loop feedback mechanism allows the system to iteratively improve focus quality based on actual image results rather than relying on manual operator judgment
2Productivity
If automated methods with a small number of recorded images are used, then the focusing process is faster, but the desired image sharpness and quality may not be consistently achieved
Solution Approach 1:
The system records a plurality of images at different parameter settings, which is more than the minimum single image approach. This excessive sampling ensures that optimal focus conditions are captured and provides sufficient data for accurate analysis, consistently achieving high image sharpness while maintaining automated speed
Solution Approach 2:
The system performs preliminary recording of multiple images at various parameter settings before analyzing them to determine the optimal focusing parameters. This preliminary data collection ensures that all necessary information is available for accurate optimization, preventing the need for additional adjustment cycles and maintaining both speed and quality
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 method simplifies and accelerates the focusing process, enabling the generation of sharper particle-microscopic images with improved quality criteria by iteratively adjusting the objective lens' excitation and object distance based on data analysis, reducing the need for manual user intervention and enhancing image sharpness and astigmatism correction.
Implementation Method 1
an objective lens for focusing the particle beam on an object
Implementation Method 2
a double deflector arranged in the beam path of the particle beam between the particle beam source and the objective lens
Data Source
AI summary
A method for operating a particle beam microscope comprises setting a distance of an object from an objective lens, setting an excitation of the objective lens, setting an excitation of a double deflector to a first setting such that a particle beam is incident on the object at a first orientation, and recording a first particle-microscopic image at these settings. The method also comprises setting the excitation of the double deflector to a second setting such that the particle beam is incident on the object at a second orientation which differs from the first orientation; and recording a second particle-microscopic image at the second setting of the double deflector. Thereupon, a new distance of the object from the objective lens is determined based on an analysis of the first and second particle-microscopic images, and the distance of the object from the objective lens is set to the new distance.