X-Ray Diffraction Detector Pulse Analysis for Charge Sharing
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Solution Overview
Problem
Solid-state X-ray detectors suffer from charge sharing, leading to reduced energy resolution and count rate linearity, particularly at higher X-ray intensities, due to the rejection of genuine coincident photons mistaken as charge sharing events.
Innovation Solution
An X-ray diffraction apparatus that examines the energy of each pulse individually, setting upper and lower thresholds to discriminate between charge sharing and genuine coincident photons, using a detection processor separate from the readout circuits to improve count rate linearity and energy resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system rejects signals that arise simultaneously in two adjacent detector cells to address charge sharing, then energy resolution is improved, but count rate linearity deteriorates at higher X-ray intensities
Solution Approach 1:
The patent changes the parameters used for event rejection from simple timing coincidence to a combination of timing coincidence and energy validation. By examining whether the sum of energies from two adjacent cells falls within an expected energy range, the system can distinguish between charge sharing events (which should be rejected) and genuine coincident photons (which should be counted), thereby maintaining count rate linearity while preserving energy resolution.
2Difficulty of detecting and measuring
If the system examines aggregate energy from two cells to differentiate coincident photons from charge sharing, then discrimination capability is improved, but robustness to noise deteriorates
Solution Approach 1:
The patent segments the energy analysis by examining the energy in each detector cell separately rather than only the aggregate energy. This allows the system to validate that each cell contributes a physically reasonable energy value, making the discrimination process more robust to noise while maintaining the ability to distinguish between charge sharing and coincident photons.
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 energy resolution and maintains count rate linearity by accurately distinguishing between charge sharing and genuine coincident photons, reducing noise susceptibility and circuit complexity.
Implementation Method 1
a detector, configured to receive and detect X-rays diffracted from the sample
Data Source
AI summary
An X-ray diffraction apparatus and method of processing signals from an X-ray diffraction apparatus are disclosed. By analysing a time delay between first and second pulses, generated by respective first and second detector cells, and by analysing an energy of each of the first pulse and the second pulse, charge sharing events and coincident photon events can be identified.