Charged Particle Beam Device Dual Detection Segmentation
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Solution Overview
Problem
Current charged particle beam devices face challenges in obtaining an image with a high signal-to-noise (S/N) ratio based on intensity and high energy resolution using pulse-height detectors, due to limitations in amplifier response speed and the upper limit of detectable BSE current.
Innovation Solution
A charged particle beam device comprising a charged particle source, detection units for intensity and pulse-height data generation, and an output unit to produce separate images based on intensity and pulse-height data, utilizing distinct detection configurations for intensity and pulse-height imaging to enhance S/N ratio and energy resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pulse-height detector is used to acquire BSE band-pass images, then energy resolution is improved, but the S/N ratio of intensity images deteriorates
Solution Approach 1:
The patent divides the detection system into two separate detection units: a pulse-height detector for acquiring energy-resolved BSE band-pass images, and an intensity detector for acquiring high S/N ratio BSE intensity images. This segmentation allows each detector to be optimized for its specific function, resolving the contradiction between energy resolution and S/N ratio that plagues single-detector systems.
2Reliability
If the BSE current detection limit is increased to improve intensity image S/N ratio, then the detectable BSE current upper limit is exceeded, but energy resolution deteriorates
Solution Approach 1:
By segmenting the detection system into dedicated intensity and pulse-height detection units, the patent allows the intensity detector to handle high current levels for good S/N ratio while the pulse-height detector maintains low current levels for excellent energy resolution, eliminating the trade-off present in single-detector configurations.
3Device complexity
If a single detector is used for both intensity and energy detection, then device complexity is reduced, but both intensity image S/N ratio and energy resolution cannot be simultaneously optimized
Solution Approach 1:
The patent applies segmentation by creating two specialized detection units instead of one general-purpose detector. This increases device complexity slightly but dramatically improves measurement precision for both energy resolution and S/N ratio, as each detector can be optimized for its specific measurement task.
Solution Approach 2:
Both detection units share common upstream components (electron beam source, optical path to sample), allowing the system to perform multiple functions (intensity imaging and energy-resolved imaging) using a partially shared infrastructure, thus balancing complexity with functionality.
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
Enables the acquisition of images with a high S/N ratio and high energy resolution, effectively addressing the limitations of existing devices by optimizing detection configurations for both intensity and pulse-height imaging.
Implementation Method 1
a charged particle beam source configured to generate a charged particle beam with which a sample is irradiated
Implementation Method 2
a charged particle detection unit configured to detect a charged particle generated when the sample is irradiated with the charged particle beam
Data Source
AI summary
A charged particle beam device includes: a charged particle beam source configured to generate a charged particle beam with which a sample is irradiated; a charged particle detection unit configured to detect a charged particle generated when the sample is irradiated with the charged particle beam; an intensity data generation unit configured to generate intensity data of the charged particle detected by the charged particle detection unit; a pulse-height value data generation unit configured to generate pulse-height value data of the charged particle detected by the charged particle detection unit; and an output unit configured to output a first image of the sample based on the intensity data and a second image of the sample based on the pulse-height value data.