X-ray Fluorescence Apparatus Grazing Angle Control
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Solution Overview
Problem
Current X-ray surface analysis techniques face challenges in achieving precise and efficient detection of contaminants due to suboptimal alignment and high background noise, leading to reduced sensitivity and longer alignment times.
Innovation Solution
The implementation of an X-ray measurement apparatus with an optical inclinometer for precise control of the grazing angle near the critical angle of total external reflection, combined with a multi-layer shield to attenuate stray X-ray fluorescence, enhances detection sensitivity and accuracy by stabilizing the X-ray fluorescence signal and reducing background noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the X-ray beam is directed at a grazing angle on the sample surface, then the detection sensitivity for contaminants is improved, but the alignment precision and stability of the grazing angle are deteriorated
Solution Approach 1:
The system employs an optical inclinometer to continuously monitor the sample stage angle and provides feedback signals to the control system. This closed-loop feedback mechanism enables real-time correction of angular deviations, maintaining stable grazing angle alignment while preserving high detection sensitivity for contaminants.
Solution Approach 2:
The patent replaces purely mechanical alignment systems with an integrated optical measurement and control system. The optical inclinometer and automated control system substitute for manual mechanical adjustment, providing precise and stable grazing angle maintenance without sacrificing detection sensitivity.
2Productivity
If the measurement time is reduced to improve throughput, then the productivity is improved, but the detection precision and signal-to-background ratio are deteriorated
Solution Approach 1:
The system optimizes multiple parameters simultaneously: X-ray energy selection, grazing angle positioning, and multi-layer shield configuration. By changing these parameters to optimal values, the system achieves high signal-to-background ratio that enables accurate contamination detection within shorter measurement times, thus improving throughput without sacrificing precision.
Solution Approach 2:
The patent converts the potentially harmful effect of stray X-ray fluorescence into a beneficial signal enhancement mechanism. By using a multi-layer shield that selectively attenuates background radiation while preserving the contaminant signal, the system transforms background noise reduction into a means for achieving high detection precision rapidly.
3Measurement precision
If a multi-layer shield is added to attenuate stray X-ray fluorescence, then the signal-to-background ratio is improved, but the device complexity is worsened
Solution Approach 1:
The shielding system is segmented into multiple functional layers, each with specific attenuation characteristics. This segmentation allows selective reduction of different background radiation components while preserving the contaminant signal, achieving high signal-to-background ratio. The modular layered structure manages complexity by dividing the shielding function into discrete, optimized components.
Solution Approach 2:
The patent employs composite multi-layer shielding structures combining different materials with complementary attenuation properties. This composite approach maximizes background radiation reduction while maintaining signal integrity, improving signal-to-background ratio without requiring excessive shielding thickness that would increase device complexity.
4Use of energy by moving object
If the grazing angle is precisely controlled near the critical angle, then the X-ray fluorescence signal intensity is improved, but the alignment time and system complexity are worsened
Solution Approach 1:
The system performs preliminary angular positioning using the optical inclinometer to pre-align the sample stage near the optimal grazing angle before X-ray measurement begins. This preliminary action reduces the time required for fine-tuning and signal optimization, decreasing overall alignment time while maintaining high signal intensity near the critical angle.
Solution Approach 2:
The optical inclinometer provides continuous feedback on the stage angle, enabling the control system to rapidly converge to the optimal grazing angle near the critical angle. This feedback-driven angular control reduces iteration time and accelerates the alignment process while ensuring the system operates at the angle that maximizes X-ray fluorescence signal intensity.
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 results in a significant increase in X-ray fluorescence signal intensity, enabling the detection of minute contaminant quantities within shorter measurement times, with improved signal-to-background ratio and throughput.
Implementation Method 1
The X-ray source is configured to generate and direct an X-ray beam to be incident at a grazing angle on a surface of a sample. The X-ray detector is configured to measure X-ray fluorescence emitted from the surface of the sample in response to being excited by the X-ray beam.
Implementation Method 2
The multi-layer shield includes multiple layers, each layer configured to attenuate stray X-ray fluorescence radiation of progressively-increasing wavelength emitted toward the X-ray detector from a previous layer of the multi-layer shield.
Implementation Method 3
The optical inclinometer is configured to measure an inclination of the surface of the sample.
Data Source
AI summary
An apparatus for X-ray measurement, includes an X-ray source, an X-ray detector, an optical inclinometer, and a processor. The X-ray source is configured to generate and direct an X-ray beam to be incident at a grazing angle on a surface of a sample. The X-ray detector is configured to measure X-ray fluorescence emitted from the surface of the sample in response to being excited by the X-ray beam. The optical inclinometer is configured to measure an inclination of the surface of the sample. The processor is configured to calibrate the grazing angle of the X-ray beam based on the measured inclination, and to further fine-tune the grazing angle based on the X-ray fluorescence measured by the X-ray detector.