Atom Probe Spectrum Prediction Range for Element Detection
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Solution Overview
Problem
Atom probe devices face challenges in accurately detecting elements with small quantities due to dispersed isotope ratios, leading to potential false negatives where elements are incorrectly identified as not present in the sample.
Innovation Solution
A material inspection apparatus and method that generates a spectrum prediction range based on simulations to compare with actual detection results, improving the probability of determining element presence and quantity by displaying actual spectrums and prediction ranges for accurate analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If isotope ratio comparison method is used to identify elements, then element identification accuracy is improved for abundant elements, but false negatives increase for elements present in small amounts
Solution Approach 1:
The system performs preliminary simulation calculations to predict the spectrum range before comparing with actual detection results. This preliminary action establishes expected value ranges for elements, allowing the system to account for statistical dispersion in isotope ratios and prevent false negatives when elements are present in small amounts.
Solution Approach 2:
The invention changes the identification approach from using fixed natural isotope ratios to using dynamically calculated spectrum prediction ranges. By simulating various detection scenarios and establishing parameter ranges (minimum/maximum values) for element presence, the system adapts to the statistical variability inherent in detecting small amounts of elements.
2Measurement precision
If strict isotope ratio matching is applied, then detection precision is improved, but probability of detecting elements in small amounts decreases
Solution Approach 1:
The system performs preliminary simulation calculations to predict the spectrum range before comparing with actual detection results. This preliminary action establishes expected value ranges for elements, allowing the system to account for statistical dispersion in isotope ratios and prevent false negatives when elements are present in small amounts.
Solution Approach 2:
Instead of requiring exact matching of isotope ratios, the system applies partial matching by accepting values within a predicted range. This relaxed criterion allows detection of elements even when the detected isotope ratio falls outside the strict natural ratio, thereby increasing the detectable quantity of elements present in small amounts.
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
Enhances the detection accuracy of elements by reducing false negatives and providing a higher probability of determining element presence and quantity, especially for elements present in small amounts, by using spectrum prediction ranges generated from simulation data.
Implementation Method 1
An atom probe device is an apparatus that ionizes and evaporates atoms on a sample surface by applying a voltage and/or a laser beam to the sample
Implementation Method 2
An atom probe device is an apparatus that ionizes and evaporates atoms on a sample surface by applying a voltage and/or a laser beam to the sample
Implementation Method 3
The atom probe device identifies a mass-to-charge ratio of each ion by measuring a flight time of the ion from the sample to the mass detector
Data Source
AI summary
A material inspection apparatus according to the present embodiment includes a sample mount capable of mounting a sample. A detector detects an atom desorbed from the sample. A voltage generator applies a voltage to the sample. A laser generator irradiates a laser beam onto the sample. An arithmetic part processes a detection result of the detector. A storage part stores a detection prediction range of a certain element and an isotope of the certain element. A display displays the detection prediction range and an actual detection result of the detector in a comparable manner.