Electron Microscope ROI Tracking for Large In-Situ Drift
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Solution Overview
Problem
Current electron microscopy systems face challenges in accurately tracking and correcting for sample drift during in-situ studies, particularly when dynamic changes are applied to the sample, as existing automation methods are insufficient for large movements, leading to difficulties in maintaining sharp images and correlating measurements with original coordinates.
Innovation Solution
A control system comprising a memory, processor, and microscope control component that registers movement associated with a region of interest within an electron microscope's field of view, allowing for dynamic centering and focusing adjustments, and applying in-situ stimuli to correct for drift, including X, Y, Z translations, and tilts, while tracking movement vectors and adjusting parameters like dose rate to prevent beam damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital field of view shifting is used to correct for sample movement, then image sharpness is improved for small movements, but the method becomes inadequate for large movements occurring during in-situ studies
Solution Approach 1:
The patent implements dynamic drift correction by continuously tracking sample movement during in-situ studies and adjusting the field of view in real-time. The system transitions from static correction to dynamic adaptation, allowing the microscope to follow sample movements as they occur during heating, cooling, or mechanical testing, thereby maintaining image sharpness across a wider range of motion magnitudes.
Solution Approach 2:
The patent introduces an intermediary tracking system that bridges the sample and the detector. This intermediary mechanism captures sample position information and translates it into appropriate field of view adjustments, enabling the system to handle both small and large movements through a coordinated multi-component approach rather than relying solely on digital shifting.
2Measurement precision
If manual tracking of sample movement is performed, then measurement coordination is maintained, but operator workload and time consumption increase significantly
Solution Approach 1:
The patent implements self-service automation where the system automatically tracks sample movement and performs drift correction without operator intervention. The automated system monitors sample position, calculates drift vectors, and adjusts imaging parameters autonomously, eliminating the need for manual tracking while maintaining accurate coordinate correlation throughout the experiment.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors sample position and uses this information to automatically adjust the field of view and maintain proper coordinate registration. The feedback loop processes sample movement data in real-time and applies corrective actions, replacing manual operator decisions with automated control based on measured drift.
3Productivity
If continuous imaging is performed during in-situ studies, then dynamic sample changes are captured, but beam damage to the sample increases
Solution Approach 1:
The patent implements periodic imaging strategies where the system alternates between imaging and beam blanking based on sample stability and experimental requirements. Rather than continuous irradiation, the electron beam is applied in controlled intervals, reducing cumulative dose while still capturing essential dynamic changes through strategically timed acquisitions.
Solution Approach 2:
The patent dynamically adjusts imaging parameters such as dose rate, exposure time, and magnification based on sample conditions and drift magnitude. The system modifies these parameters in real-time to optimize the balance between capturing sufficient data and minimizing beam damage, allowing higher doses when sample movement is minimal and lower doses when drift requires frequent repositioning.
Data Source
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AI summary
Control system configured for sample tracking in an electron microscope environment registers a movement associated with a region of interest located within an active area of a sample under observation with an electron microscope. The registered movement includes at least one directional constituent. The region of interest is positioned within a field of view of the electron microscope. The control system directs an adjustment of the electron microscope control component to one or more of dynamically center and dynamically focus the view through the electron microscope of the region of interest. The adjustment comprises one or more of a magnitude element and a direction element.