Charged Particle Beam Scanning Synchronized to Pump EMI
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Solution Overview
Problem
Scientific instruments, such as charged particle systems, face challenges in maintaining accurate scanning patterns due to electromagnetic interference (EMI) generated by components like molecular pumps, which can disrupt the scanning process and affect sample measurement accuracy.
Innovation Solution
An antenna is placed near EMI-generating components and tuned to the frequency of the interference. This antenna sends signals to a controller, which adjusts the scanning pattern of the charged particle beam to avoid interference peaks, such as aligning scan lines with zero crossings of the EMI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shielding is provided to block electromagnetic interference, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses a sensor to detect electromagnetic interference in real-time and feeds this information back to the controller, which then adjusts the scanning pattern dynamically. This feedback mechanism allows the system to maintain measurement accuracy without requiring complex physical shielding structures.
Solution Approach 2:
The system changes the scanning parameters (timing, pattern, duration) based on detected electromagnetic interference conditions. By dynamically adjusting these parameters, the system maintains scanning accuracy without adding complex shielding hardware.
2Measurement precision
If sensitive components are situated away from electromagnetic interference, then measurement accuracy is improved, but instrument size increases
Solution Approach 1:
Rather than physically separating components, the system uses real-time detection and feedback to dynamically adjust scanning operations. This allows sensitive components to remain in compact positions while maintaining measurement accuracy through software-based interference management.
Solution Approach 2:
The system moves from a spatial solution (physical separation) to a temporal solution (time-based scanning adjustments). By operating in the time domain rather than space, the system maintains compact size while achieving the same interference mitigation effect.
3Measurement precision
If scanning is avoided during electromagnetic interference peaks, then measurement accuracy is improved, but productivity decreases
Solution Approach 1:
The system uses periodic scanning patterns that are synchronized with the detected electromagnetic interference cycles. By timing scans to occur during low-interference periods and skipping high-interference periods, the system maintains accuracy while maximizing throughput through optimized periodic operation.
Solution Approach 2:
The scanning pattern is made dynamic and adaptive rather than static. The system continuously monitors interference levels and adjusts scanning timing in real-time, allowing it to maintain high productivity by scanning during favorable conditions while preserving accuracy by avoiding poor conditions.
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
The solution effectively reduces the impact of EMI on scanning patterns, enhancing the accuracy and reliability of sample scanning in scientific instruments, even as instruments shrink in size.
Implementation Method 1
an antenna configured to detect a frequency of electromagnetic interference generated by the charged particle instrument
Data Source
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AI summary
Systems and methods for adjusting scanning patterns in scientific instruments based on electromagnetic interference. One example charged particle instrument includes a chamber supporting a sample, a column coupled to the chamber, a pump configured to establish a vacuum within the chamber, a sensing device configured to detect a measure of a frequency of electromagnetic interference generated via the pump, and a controller including an electronic processor and a memory. The column includes a charged particle source configured to generate a charged particle beam traveling through the column and into the chamber. The charged particle beam is generated according to a scanning pattern. The controller configured to receive, from the sensing device, a signal indicative of the frequency of the electromagnetic interference and adjust the scanning pattern based on the frequency of the electromagnetic interference.