Electron Microscope Monochromator Slit Identification
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Solution Overview
Problem
Monochromators in electron microscopes are cumbersome to adjust due to the inability to directly confirm slit widths, requiring manual counting and identification by operators, which complicates the process and is inefficient, especially for unskilled users.
Innovation Solution
An electron microscope system with an energy filter, slit plate, and measuring sections that allow for the identification of the active slit through which the electron beam passes, using intensity measurements to determine the slit width and automate the adjustment process, thereby simplifying the operation and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual counting and identification of slit widths is used, then the monochromator can be adjusted, but the operation becomes cumbersome and inefficient
Solution Approach 1:
The patent replaces the mechanical manual counting method with an optical detection system. A camera captures images of the slit plate, and image processing automatically identifies which slit is active and its width. This substitution of mechanical operation with optical-electronic systems directly resolves the contradiction by making adjustment easier and faster.
Solution Approach 2:
The system enables self-identification of the active slit through automated image processing. The camera and processing unit work autonomously to detect and identify the slit width without requiring operator intervention for counting or identification, thus improving ease of operation and reducing time loss.
2Adaptability or versatility
If multiple slits with different widths are provided, then various energy widths can be selected, but the complexity of identifying the active slit increases
Solution Approach 1:
The patent replaces complex manual identification processes with automated optical detection. The camera system captures the slit plate configuration, and image processing algorithms automatically determine which slit is active and its width, thereby managing the complexity of multiple slit options without increasing operational difficulty.
Solution Approach 2:
The camera and image processing system serve as intermediaries between the multiple slits and the operator. Instead of directly managing the complexity of multiple slit options, the intermediary system automatically identifies and communicates the active slit information, simplifying the interface while maintaining versatility.
3Adaptability or versatility
If the slit plate is mechanically moved to switch slits, then different energy widths can be selected, but the operator cannot directly confirm the slit shape and width
Solution Approach 1:
The patent replaces mechanical slit switching with automated optical detection. The camera system visually captures and identifies the active slit and its width, providing direct confirmation information that was previously lost in mechanical operations. This substitution ensures information transparency while maintaining versatility.
Solution Approach 2:
The patent uses visual imaging to provide direct observation of the slit plate. By capturing images and processing them to highlight the active slit, the system provides visual confirmation of slit width and position, compensating for the loss of direct visual information in mechanical systems.
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 system enables easy identification and adjustment of the active slit, reducing the need for manual counting and improving the precision and ease of use for operators, allowing for optimized electron beam brightness and efficient operation.
Implementation Method 1
The energy filter portion produces a deflecting field in the beam path of the electron beam to spectrally disperse the beam by making use of difference of the orbit depending on electron velocity in the deflecting field
Implementation Method 2
a first measuring section for measuring the intensity of the electron beam emitted from the electron beam source; a second measuring section for measuring the intensity of the electron beam that has passed through an active one of the energy-selecting slits
Data Source
AI summary
An electron microscope is offered which can facilitate adjusting a monochromator. The electron microscope (100) includes the monochromator (20) having an energy filter (22) for dispersing the beam (EB) according to energy and a slit plate (24) disposed on an energy dispersive plane. The slit plate (24) is provided with plural energy-selecting slits (25) which are different in width taken in a direction where the beam (EB) is dispersed. The microscope (100) further includes a lens system (30) on which the beam impinges after being monochromatized by the monochromator (20), a first measuring section (50) for measuring the intensity of the beam (EB) emitted from an electron beam source (10), a second measuring section (60) for measuring the intensity of the beam (EB) that has passed through an active one (25-L) of the energy-selecting slits (25), and a slit identifying portion (72) for identifying the active energy-selecting slit (25-L) from the plural energy-selecting slits (25) on the basis of the results of measurements made by the first and second measuring sections (50, 60).