X-ray Detector Module Curved Sensor Array Parallax Reduction
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Solution Overview
Problem
Existing one-dimensional x-ray detector modules with straightly arranged sensor elements suffer from measurement errors due to parallax effects, particularly at the edges, leading to distorted diffraction images and inaccurate peak positioning when measuring extended angle ranges.
Innovation Solution
Designing detector modules with uniformly spaced sensor elements, where each sensor element has the same distance from the specimen position, allowing them to be arranged in a curved trajectory, such as a circular path, to minimize parallax errors and ensure comparable intensity measurements across the detector module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensor elements are arranged in a straight line on a plane substrate, then the device complexity is reduced and manufacturing is easier, but measurement precision deteriorates due to parallax effects at edge regions
Solution Approach 1:
The sensor elements are arranged along a circular arc trajectory instead of a straight line, with their centroids positioned at the same distance R0 from the specimen position. This curved arrangement ensures that diffracted x-ray beams strike all sensor elements at perpendicular angles, eliminating the parallax effect that causes spatial position detection errors in straight-line configurations.
2Quantity of substance
If the detector module covers an extended angle range, then the quantity of measurement information increases, but measurement precision deteriorates due to increasing parallax errors toward edge regions
Solution Approach 1:
By arranging sensor elements along a circular arc, the detector can cover an extended polar angle range while maintaining perpendicular incidence of x-ray beams across all sensor elements. This eliminates the position-dependent parallax errors that would otherwise increase toward the edges of a wide-angle detector.
Solution Approach 2:
Each sensor element is positioned with its centroid at the same distance R0 from the specimen position, ensuring that local measurement conditions are uniform across all elements. This local optimization of positioning geometry ensures consistent measurement precision across the entire extended angle range.
3Quantity of substance
If multiple detector modules are used in succession to measure extended angle ranges, then the measurement information coverage increases, but device complexity increases and measurement precision deteriorates due to parallax effects
Solution Approach 1:
A single detector module with sensor elements arranged along a circular arc can cover an extended polar angle range in one component, eliminating the need for multiple successive detector modules. This reduces device complexity while maintaining measurement precision through the parallax-free geometry.
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 reduces measurement errors and maintains consistent spatial resolution, allowing for accurate and comparable intensity measurements across the detector module, thereby improving the quality of x-ray diffraction data without the need for circular arc-shaped detectors.
Implementation Method 1
the x-ray radiation is diffracted at the lattice planes of the crystals ('crystal planes') in the specimen or the associated atoms
Implementation Method 2
an active zone, in which x-ray radiation can be detected, is subdivided into (frequently strip-shaped) sensor elements
Data Source
AI summary
A measuring arrangement (20) for x-ray radiation, comprising—a sample position (3), which can be illuminated by xray radiation (2) and—an x-ray detector (13) for detecting x-ray radiation emitted from the sample position (3), comprising at least one detector module (21-24), wherein the detector module (21-24) has a plurality of sensor elements (14; 14a-14e) arranged successively in a measuring direction (MR), each sensor element having a centroid (18), wherein the sensor elements (14; 14a-14e) are arranged in a common sensor plane (16) of the detector module (21-24), is characterized in that at least a majority of the sensor elements (14; 14a-14e) of the detector module (21-24), preferably all the sensor elements (14; 14a-14e) of the detector module (21-24), are designed as uniformly spaced sensor elements (14; 14a-14e), wherein the centroids (18) of the sensor elements (14; 14a-14e) have an equal distance R0 from the sample position (3). The measuring arrangement according to the invention can be implemented having flat detector modules, in particular semiconductor detector modules, and is less susceptible to measurement errors.