Stacked Flat Bragg Diffractors for X-Ray Spectroscopy
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Solution Overview
Problem
Existing parallel beam wavelength dispersive spectrometers (PBWDS) face limitations such as inefficiency in performing multiple spectral measurements, narrow spectral band diffraction by a single flat Bragg diffractor, and difficulty in balancing energy band and resolution for optimal throughput.
Innovation Solution
The implementation of a plurality of stacked flat Bragg diffractors, each positioned sequentially along the x-ray propagation axis, with a separation of less than 200 millimeters, to receive and diffract x-rays with minimal spectral overlap, allowing for concurrent measurement of multiple x-ray energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single flat Bragg diffractor is used, then the device complexity is low, but the productivity is limited due to inability to perform multiple spectral measurements concurrently
Solution Approach 1:
The system divides the spectral measurement function into multiple segments by using several flat Bragg diffractors, each configured to diffract a specific energy band. This segmentation enables concurrent measurement of multiple spectral regions, transforming a single-function device into a multi-functional spectrometer that can perform multiple spectral measurements simultaneously.
Solution Approach 2:
The patent introduces a spatial dimension to the measurement process by stacking diffractors at different positions along the beam path. Instead of sequentially measuring different energy bands with a single diffractor, the system uses multiple diffractors positioned in series, each handling a specific energy range, thereby adding a dimensional aspect to the spectral analysis capability.
2Measurement precision
If a single flat Bragg diffractor diffracts narrow spectral bands, then the measurement precision for specific energy ranges is improved, but the productivity decreases due to limited spectral coverage
Solution Approach 1:
The spectral range is segmented into multiple bands, with each flat Bragg diffractor responsible for a specific segment. This allows the system to maintain high spectral resolution within each band while collectively covering a broad spectral range, thus achieving both precision and productivity.
Solution Approach 2:
The stacked diffractor system creates a universal spectrometer capable of measuring multiple energy bands simultaneously. Each diffractor is optimized for a specific energy range, but collectively they provide universal spectral coverage, enabling the device to handle diverse spectroscopy applications with a single configuration.
3Productivity
If multiple flat Bragg diffractors are stacked, then the productivity for concurrent spectral measurements is improved, but the device complexity increases due to alignment and separation requirements
Solution Approach 1:
The system segments the measurement function across multiple diffractors positioned at different locations along the beam path. Each diffractor handles a specific energy band, and the segmentation is maintained through precise spatial positioning, reducing the complexity of coordinating multiple components by assigning each a dedicated functional role.
Solution Approach 2:
The patent introduces an intermediary collimation system that manages the beam between stacked diffractors. This intermediary component ensures proper beam conditioning and alignment, simplifying the overall system complexity by providing a standardized interface between diffractors and reducing the precision requirements for direct diffractor-to-diffractor alignment.
4Length of stationary object
If the separation between stacked diffractors is reduced, then the device footprint is minimized, but the spectral overlap between diffracted portions increases
Solution Approach 1:
Each diffractor is configured with specific local properties (crystal orientation, d-spacing, Bragg angle) optimized for its designated energy band. This local quality optimization ensures that even with reduced separation, each diffractor maintains its spectral specificity, minimizing overlap while allowing compact stacking.
Solution Approach 2:
The system adjusts key parameters such as Bragg angle, crystal d-spacing, and diffractor orientation for each stacked element to optimize spectral separation. By changing these parameters across the stack, the system achieves minimal spectral overlap even with reduced physical separation, enabling compact design without sacrificing measurement precision.
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 enhances the efficiency of x-ray analysis by allowing for the concurrent measurement of multiple x-ray energies with reduced spectral overlap, thereby improving the throughput and spectral resolution of x-ray spectroscopy techniques.
Implementation Method 1
Parallel beam wavelength dispersive spectrometers (PBWDS) diffract narrow spectral (e.g., energy) bands of x-rays of differing energies in different directions, according to Bragg's law
Data Source
AI summary
An apparatus includes a plurality of stacked flat Bragg diffractors having at least a first flat Bragg diffractor and a second flat Bragg diffractor. The first and second flat Bragg diffractors are positioned sequentially along an x-ray propagation axis of an x-ray beam. The x-ray beam includes x-rays and has an angular beam divergence less than 30 mrad in at least one direction.