Depth resolved snapshot energy-dispersive X-ray diffraction using a conical shell beam.

Area of Science:

• Materials Science
• Imaging Technology
• Crystallography

Background:

• Traditional diffraction imaging methods can be time-consuming and require precise sample alignment.
• Characterizing multiple overlapping samples often necessitates complex setups or sequential measurements.

Purpose of the Study:

• To develop a novel imaging architecture for efficient collection of range-encoded diffraction patterns.
• To enable rapid materials characterization of overlapping samples using a single projection.
• To demonstrate the feasibility of calculating d-spacing values from minimal exposure data.

Main Methods:

• A new imaging architecture was designed to capture diffraction patterns from overlapping samples in a single conical shell projection.
• Measurements were performed in the beam's dark area using a centrally positioned aperture and a pixelated energy-resolving detector.
• The method utilizes range-encoded diffraction patterns for data acquisition.

Main Results:

• A single exposure measurement of 0.3 mAs was sufficient to calculate d-spacing values.
• The axial positions of samples were not required for accurate measurements.
• The technique demonstrated robustness against crystallographic textures in the samples.

Conclusions:

• The developed imaging architecture enables rapid volumetric materials characterization.
• This direct imaging method shows significant potential for applications in medicine, non-destructive testing, and security screening.
• The technique offers a faster and potentially more versatile alternative to existing diffraction imaging methods.