Abstract:
Background X-ray backlighting radiography and source-spot characterization are important diagnostic requirements in inertial confinement fusion (ICF) experiments, while direct X-ray verification usually involves complex experimental conditions and high implementation cost. Optical-band equivalence experiments can provide an accessible route for preliminary validation of coded imaging schemes.
Purpose This study aims to verify the feasibility of sphere-based coded imaging under visible-light conditions and to provide experimental support for subsequent X-ray backlighting and source-spot diagnostic applications.
Methods An opaque metallic sphere was used as the coding element to encode a structured light source with known geometric dimensions. The coded images were reconstructed by Wiener filtering and the Richardson-Lucy algorithm. The full width at half maximum (FWHM) of the vertically integrated intensity profile was used as the main quantitative metric, and the reconstructed stripe widths and spacings were compared with the designed value.
Results Both algorithms recovered the main stripe structures. Wiener filtering showed higher stability in geometric measurement, with reconstructed stripe widths and spacings mainly distributed within 1.83 to 1.98 mm, in good agreement with the designed value of 2 mm. Repeated experiments showed good reproducibility.
Conclusions With geometric similarity and a unified processing workflow, sphere-based coded imaging can quantitatively recover characteristic dimensions and basic morphology on an optical platform, providing a low-cost and reusable verification method for ICF-related X-ray backlighting and source-spot diagnostics.
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