Wavelength Dispersive X-Ray Fluorescence Spectrometer Detector Positioning
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Solution Overview
Problem
Conventional wavelength dispersive X-ray fluorescence spectrometers with focusing optical systems face complexity in structure, high costs, and decreased measurement accuracy due to lower background sensitivity and the need for complicated analysis conditions, which hinder high-precision quantitative and principal component analysis at high counting rates.
Innovation Solution
A wavelength dispersive X-ray fluorescence spectrometer with a focusing optical system featuring a single one-dimensional detector and a detector position change mechanism that allows the detector to be set at either a parallel or intersection position, enabling accurate net intensity measurement and high counting rates through simultaneous peak and background intensity detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a receiving slit with multiple openings is used to measure background intensity in adjacent area, then background measurement is enabled, but sensitivity decreases and measurement accuracy deteriorates
Solution Approach 1:
The receiving slit is divided into multiple openings (first opening for peak area, second opening for background area) that can be selectively activated. This segmentation allows the system to measure both peak intensity and background intensity simultaneously using a single detector, resolving the contradiction between enabling background measurement and maintaining high sensitivity.
2Measurement precision
If multiple spectroscopic devices are provided to measure peak and background separately, then measurement accuracy improves, but device complexity and cost increase
Solution Approach 1:
A single spectroscopic device is designed to perform multiple functions: it can measure both peak intensity and background intensity by switching between different openings in the receiving slit. This multi-functionality eliminates the need for separate spectroscopic devices for peak and background measurement, reducing system complexity while maintaining measurement accuracy.
Solution Approach 2:
An optical path selection unit (beam splitter or switch) is introduced as an intermediary component to direct secondary X-rays to different openings in the receiving slit. This intermediary mechanism enables a single detector to access both peak and background regions, achieving accurate measurements without requiring multiple spectroscopic devices.
3Reliability
If attenuator is used to decrease fluorescent X-ray intensity for high-counting-rate samples, then counting linearity is maintained, but measurement time increases and productivity decreases
Solution Approach 1:
The system is pre-configured with multiple openings in the receiving slit, where the first opening is optimized for high-counting-rate measurements and the second opening is optimized for background measurements. This preliminary arrangement allows the system to handle high-counting-rate samples directly without requiring attenuators, maintaining counting linearity while preserving measurement speed.
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 configuration allows for high-precision quantitative analysis at high speed and high-precision principal component analysis with a simple structure, overcoming the limitations of lower background sensitivity and complexity in existing systems.
Implementation Method 1
a spectroscopic device configured to monochromate and focus the secondary X-rays that have passed through the divergence slit
Implementation Method 2
a spectroscopic device configured to monochromate and focus the secondary X-rays that have passed through the divergence slit
Implementation Method 3
a single one-dimensional detector having a plurality of detection elements arranged linearly and having a receiving surface perpendicular to an optical axis of focused secondary X-rays
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A wavelength dispersive X-ray fluorescence spectrometer includes a single one-dimensional detector (10) having detection elements (7) arranged linearly, and includes a detector position change mechanism (11) for setting a position of the one-dimensional detector (10) to either a parallel position at which an arrangement direction of the detection elements (7) is parallel to a spectral angle direction of a spectroscopic device (6) or an intersection position at which the arrangement direction intersects the spectral angle direction. At the parallel position, a receiving surface of the one-dimensional detector (10) is located at a focal point of focused secondary X-rays (42). At the intersection position, a receiving slit (9) is disposed at the focal point of the focused secondary X-rays (42), and the receiving surface is located at a traveling direction side of the focused secondary X-rays (42) farther from the spectroscopic device (6) than the receiving slit (9).