X-ray Diffraction Signal Correction Using Reference Object Scans
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Solution Overview
Problem
X-ray diffraction identification systems suffer from signal degradation due to self-attenuation of diffracted X-rays by items under investigation, leading to difficulties in identifying threat materials and increased false alarm rates.
Innovation Solution
A method and system that utilize a reference object with an atomic number ranging from 40 to 60, such as silver nitrate, to preprocess data by accounting for the intensity of scattered radiation, Photoelectric pathlength, and Compton pathlength of both the substance and the reference object, using a dual-energy transmission detector and scatter detector to reduce signal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If X-ray diffraction identification systems are used to detect threat materials, then material discrimination capability is improved, but signal degradation occurs due to self-attenuation of diffracted X-rays
Solution Approach 1:
The system performs preliminary measurements by scanning reference objects with known atomic numbers and densities before analyzing the actual substance. This pre-characterization data is stored and later used to correct attenuation effects during the actual material analysis, allowing the system to compensate for self-attenuation before it degrades the signal.
Solution Approach 2:
The system uses feedback from reference object scans to generate correction factors that are applied to the actual substance measurements. The reference object scans provide information about attenuation characteristics that feed back into the processing of the actual material data, enabling real-time compensation for self-attenuation effects.
2Reliability
If complete inspection of checked bags is performed to detect concealed explosives, then security screening thoroughness is improved, but false alarm rate increases due to signal degradation
Solution Approach 1:
The system changes the processing parameters by introducing attenuation correction factors that adjust the X-ray signal based on the specific material properties detected. By modifying the signal processing parameters to account for self-attenuation, the system maintains high screening thoroughness while reducing false alarms caused by degraded signals.
3Reliability
If reference object with atomic number 40-60 is used for pre-processing, then signal degradation is reduced, but device complexity increases
Solution Approach 1:
The reference object acts as an intermediary element that simplifies the complex problem of self-attenuation correction. By using a reference object with known properties (atomic number 40-60), the system creates a mediator that can be scanned and used to generate correction factors, thereby reducing signal degradation without requiring complex real-time calculations during actual material analysis.
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
The preprocessing method effectively reduces signal degradation, improving the accuracy of material identification and reducing false alarms by accounting for the attenuation effects, thereby enhancing the detection of threat materials.
Implementation Method 1
a reference object configured to output scattered radiation upon receiving the X-rays
Implementation Method 2
a dual-energy transmission detector configured to detect the transmission radiation within the first and second sets
Implementation Method 3
a scatter detector including a detector element and configured to detect the scattered radiation within the first and second sets
Data Source
AI summary
Systems and methods for reducing a degradation effect on a signal are described. One of the methods includes pre-processing data based on a scan of a reference object and a scan of a substance. The reference object includes a material having an atomic number ranging from and including forty to sixty.