Particle Beam Microscope X-ray Detection Segmentation
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Solution Overview
Problem
Conventional particle beam microscopes generate X-ray spectra with an excessively small number of detected X-ray events, making it difficult to determine the composition of objects with desired significance within a reasonable measurement time.
Innovation Solution
A particle beam microscope design featuring a magnetic lens with a front and rear pole piece, an object holder, and an X-ray detection unit with multiple radiation-sensitive substrates arranged at different elevation angles and positions, allowing for the separation and precise calculation of characteristic and bremsstrahlung X-ray radiation, enabling higher significance in composition determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-detector X-ray detection is used, then device complexity is low, but measurement precision is insufficient due to small number of detected X-ray events
Solution Approach 1:
The X-ray detection unit is segmented into multiple independent X-ray detectors (first X-ray detector and second X-ray detector), each with its own radiation-sensitive substrate. This segmentation allows simultaneous detection of X-ray events from different spatial positions and angles, increasing the total number of detected X-ray events and improving measurement precision without requiring a single complex detector
2Measurement precision
If multiple X-ray detectors are arranged at different positions, then measurement precision improves through better separation of characteristic and bremsstrahlung radiation, but device complexity increases
Solution Approach 1:
The first and second X-ray detectors are arranged at different elevation angles relative to the object plane, utilizing the angular dimension to differentiate between characteristic X-ray radiation and bremsstrahlung radiation. This dimensional arrangement enables spectral separation and improved composition analysis while maintaining a manageable device structure through geometric configuration rather than complex mechanical systems
3Measurement precision
If longer measurement time is used, then measurement precision improves through more X-ray events, but productivity decreases
Solution Approach 1:
Multiple X-ray detectors operate simultaneously and continuously to detect X-ray events from the object, maximizing the rate of useful X-ray event detection. This continuous parallel detection significantly increases the number of X-ray events collected per unit time, improving measurement precision while reducing the overall measurement time required
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 design enhances the accuracy of composition analysis by distinguishing between characteristic and bremsstrahlung X-ray radiation, allowing for precise determination of object composition and reducing measurement time through increased X-ray quantum detection.
Implementation Method 1
a magnetic lens having an optical axis and at least one front pole piece arranged in the beam path along the optical axis at a distance upstream of an object plane
Implementation Method 2
an X-ray detection unit, wherein the X-ray detection unit comprises a first X-ray detector having a first radiation-sensitive substrate, and a second X-ray detector having a second radiation-sensitive substrate
Data Source
AI summary
A particle beam microscope comprises a magnetic lens 3 having an optical axis 53 and a pole piece 21. An object 5 to be examined is mounted at a point of intersection 51 between an optical axis 53 and the object plane 19. First and second X-ray detectors 33 have first and second radiation-sensitive substrates 35 arranged such that a first elevation angle β1 between a first straight line 551 extending through the point of intersection 51 and a center of the first substrate 351 and the object plane 19 differs from a second elevation angle β2 between a second straight line 552 extending through the point of intersection 51 and a center of the second substrate 352 and the object plane 19 by more than 14°.