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Phase-Shifting Diffraction Interferometer For NIF Ignition-Target Shell Inspection.pdf

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Summary

Key aspects include:

- Design Overview: The PSDI head is mounted on an XYZ linear stage stack, while the shell is held by vacuum in a transfer chuck on a Theta-Phi rotary stage stack. The system allows for closed-loop computer control, positioning the interferometer relative to the shell and orienting the shell to measure specific surface portions.
- Operation: The PSDI consists of a laser front-end and an interferometer head. Each measurement takes 3 seconds, with eight individual measurements averaged together. Approximately 50 measurements are needed to map a hemisphere, taking around 7.5 minutes including indexing, re-centering, and data management.
- Transfer Chucks: Shells are mounted using transfer chucks to minimize handling and facilitate flipping. The chucks mate with receiver plates, providing radial, axial, and tilt constraints, and a vacuum seal. A vision system aids in precise part transfer between chucks.
- Error Budget: The system retains an acceptable fringe pattern if the shell's center stays within a 20 to 50 µm sphere of uncertainty relative to the PSDI head. Surface features are used to stitch data together, accommodating uncertainty in angular orientation.
- Motivation: The interferometer is developed to characterize target capsules for Inertial Confinement Fusion (ICF), ensuring their surfaces are extremely smooth and free of defects. Measurements have already improved manufacturing processes.

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Description

A phase-shifting diffraction interferometer (PSDI) system is designed to map the outer surface of small spherical parts (shells). It consists of a laser front-end, an interferometer head, and motion control systems for positioning the head and the shell. The shell is held by vacuum on a Theta-Phi rotary stage, while the interferometer head is mounted on an XYZ linear stage stack.

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  • File Format: PDF
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  • Pages: 4
  • Language: EN
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  • Last Updated: 2 hours ago

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This PDF document about Phase-Shifting Diffraction Interferometer for NIF Ignition-Target Shell Inspection provides comprehensive information and guidance. Whether you're a beginner or advanced user, this resource offers valuable insights into Phase-Shifting Diffraction Interferometer for NIF Ignition-Target Shell Inspection.

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Phase-Shifting guidePhase-Shifting tutorialDiffraction guideDiffraction tutorialInterferometer guideInterferometer tutorialIgnition-Target guideIgnition-Target tutorialShell guideShell tutorialInspection guideInspection tutorial

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