X-ray Backscatter Performance Quantification via Modulation Transfer Function
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Solution Overview
Problem
X-ray backscatter systems lack a reliable method for calibrating and quantifying performance due to differences in x-ray scattering from various materials, and they face challenges with small aperture sizes required for detecting small features, which result in low x-ray flux and slow scan speeds.
Innovation Solution
A system and method using a modulation transfer function (MTF) standard with a user interface to quantify x-ray backscatter performance by plotting backscatter signals from rods of varying widths, and an adjustable aperture system to optimize x-ray flux and scan speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If small aperture sizes are used to detect small features, then measurement precision is improved, but productivity deteriorates due to low x-ray flux and slow scan speeds
Solution Approach 1:
The patent implements an adjustable aperture system that allows the aperture size to be dynamically changed during operation. This enables the system to switch between small apertures for high-precision detection of small features and large apertures for fast scanning of large areas, resolving the contradiction between measurement precision and productivity
Solution Approach 2:
The system changes the physical parameter of aperture size to optimize performance. By providing multiple aperture sizes (e.g., 0.25mm for small feature detection, larger sizes for general scanning), the system can adjust this parameter to match the specific inspection requirements, thereby balancing precision and speed
2Measurement precision
If small aperture sizes are used to detect small features, then measurement precision is improved, but loss of energy increases due to low x-ray flux
Solution Approach 1:
The adjustable aperture system allows dynamic optimization of x-ray flux by selecting appropriate aperture sizes. When small features need detection, small apertures are used despite lower flux; when flux is the limiting factor, larger apertures can be selected, thus managing the energy loss while maintaining precision when needed
3Adaptability or versatility
If multiple sets of apertures of different sizes are used, then adaptability is improved, but device complexity increases
Solution Approach 1:
Instead of having multiple fixed aperture sets that require manual switching, the patent implements a dynamically adjustable aperture mechanism. This single mechanism can continuously or discretely adjust aperture size, providing the same versatility as multiple fixed sets but with reduced complexity and faster transition times
4Measurement precision
If smaller apertures are used, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The adjustable aperture system allows the use of larger, easier-to-manufacture aperture components that can be programmed or mechanically adjusted to create smaller effective apertures. This avoids the need to precisely manufacture multiple small aperture openings, thereby improving ease of manufacture while maintaining the capability for high-precision detection
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
Enables accurate measurement and comparison of x-ray backscatter system performance, improves image contrast for small features, and allows for faster scan speeds by adjusting aperture sizes during scans.
Implementation Method 1
x-ray backscattering systems provide an inspection process in which x-rays are reflected from the object or component of interest and recorded by a detector or detectors
Implementation Method 2
Scattered x-rays off of the standards or gauges used for traditional through-transmission x-ray inspection do not provide relevant spatial frequency information because x-rays are scattered differently (i.e., with respect to intensity and angle) from different types of materials
Data Source
AI summary
A system for quantifying x-ray backscatter system performance is disclosed. The system includes one or more x-ray backscatter detectors, an x-ray tube, a support, and a plurality of rods mounted on the support and arranged in groups. Each group of rods includes at least two rods having the same width. The system also includes a user interface configured to connect to the x-ray backscatter detectors to receive a backscatter signal from the x-ray backscatter detectors associated with the x-ray tube, where the user interface plots a modulation transfer function representing x-ray backscatter for each rod of the plurality of rods from x-rays transmitted by the x-ray tube.