Error analysis model-driven workflow for self-calibration stitching testing of X-ray flat surfaces.

Area of Science:

• Optics and Metrology
• Surface Metrology
• X-ray Optics Testing

Background:

• Self-calibration stitching tests are crucial for evaluating X-ray flat surfaces, but accuracy is affected by environmental disturbances, motion errors, misalignments, and parameter choices.
• Existing error analyses are insufficient for practical applications, leaving optimal test parameters and necessary error control levels for high-accuracy X-ray surfaces undefined.

Purpose of the Study:

• To develop a systematic, model-driven workflow for self-calibration stitching tests of X-ray flat surfaces.
• To enable quantitative evaluation of error sources and test parameters impacting accuracy.
• To guide the determination of error control levels and optimal test parameters, moving beyond empirical methods.

Main Methods:

• Development of an error analysis model-driven workflow for self-calibration stitching testing.
• Systematic evaluation of the influence of various error sources (e.g., motion errors, misalignments) and test parameters (e.g., overlapping ratios, sub-aperture sizes) on test accuracy.
• Demonstration using a 250 mm × 30 mm flat X-ray mirror with a 0.2 nm RMS accuracy requirement.

Main Results:

• The proposed workflow systematically evaluates the impact of different error sources and test parameters on the accuracy of self-calibration stitching tests.
• It provides a quantitative basis for determining necessary control levels for error sources and optimal test parameters.
• Verification experiments confirmed the workflow's effectiveness in guiding test procedures to achieve high accuracy for X-ray flat mirrors.

Conclusions:

• The developed model-driven workflow offers a standardized approach for evaluating and improving the accuracy of self-calibration stitching tests for X-ray flat surfaces.
• This methodology addresses the limitations of previous empirical approaches, providing quantitative guidance for achieving stringent accuracy requirements.
• The workflow is essential for the precise manufacturing and testing of critical optical components used in X-ray applications.