Retractable EDX Detector for Symmetrical X-Ray Coverage
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Solution Overview
Problem
Energy dispersion x-ray detectors face challenges in achieving accurate measurements due to the large tip of the illumination column, which restricts their proximity and positioning, resulting in partial and asymmetrical angular coverage.
Innovation Solution
A method involving the positioning of an energy dispersive X-ray detector at two positions, with a charged particle beam system that includes a controller, movable stage, charged particle beam optics, and an EDX detector motion module, allowing the detector to scan a flat surface and detect x-ray photons while moving between positions to achieve symmetrical coverage and accurate composition analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the EDX detector is positioned close to the microscopic element for accurate measurements, then measurement precision is improved, but the large tip of the illumination column prevents the detector from being positioned in proximity
Solution Approach 1:
The illumination column tip is made movable relative to the detector, allowing dynamic adjustment of the tip position to access areas near the detector without requiring the detector itself to move into the column's physical space
Solution Approach 2:
The solution moves the problem from the detector's positional constraints to the column tip's positional freedom, effectively changing the dimension of adjustment from detector location to column tip location
2Measurement precision
If the EDX detector is positioned asymmetrically due to the column tip, then the detector can be placed near the element, but asymmetrical angular coverage results reducing measurement accuracy
Solution Approach 1:
The movable column tip is positioned asymmetrically relative to the detector, allowing the tip to access the specimen from optimal angles while the detector remains in a fixed, symmetric position for balanced angular coverage
Solution Approach 2:
The movable column tip acts as an intermediary that can be repositioned to provide asymmetrical illumination access while the detector maintains a fixed, symmetric position, separating the functions of access and detection
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 approach enhances the accuracy of EDX measurements by enabling symmetrical coverage of x-ray photons and precise composition evaluation of multiple points on a specimen, improving the overall measurement precision.
Implementation Method 1
scanning a flat surface of the specimen by a charged particle beam that exits from a charged particle beam optics tip
Implementation Method 2
detecting, by the EDX detector, x-ray photons emitted from the flat surface
Data Source
AI summary
A method for evaluating a specimen, the method can include positioning an energy dispersive X-ray (EDX) detector at a first position; scanning a flat surface of the specimen by a charged particle beam that exits from a charged particle beam optics tip and propagates through an aperture of an EDX detector tip; detecting, by the EDX detector, x-ray photons emitted from the flat surface as a result of the scanning of the flat surface with the charged particle beam; after a completion of the scanning of the flat surface, positioning the EDX detector at a second position in which a distance between the EDX detector tip and a plane of the flat surface exceeds a distance between the plane of the flat surface and the charged particle beam optics tip; and wherein a projection of the EDX detector on the plane of the flat surface virtually falls on the flat surface when the EDX detector is positioned at the first position and when the EDX detector is positioned at the second position.