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In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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High-sensitivity roll-angle interferometer.

Yanfen Le, Wenmei Hou, Kai Hu

|October 10, 2013

Summary

This summary is machine-generated.

A novel roll-angle interferometer achieves high sensitivity and accuracy by using centrosymmetric beams and specialized optical assemblies. This design minimizes errors and enhances measurement stability, reaching sub-microradian resolution.

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Area of Science:

Optics and Photonics
Metrology
Interferometry

Background:

Accurate measurement of roll angle is critical in various applications, including aerospace and precision engineering.
Existing interferometric methods may suffer from cross-talk and limited sensitivity.

Purpose of the Study:

To present a novel, high-sensitivity roll-angle interferometer.
To demonstrate enhanced accuracy and stability in roll-angle measurements.

Main Methods:

Utilizing two sets of centrosymmetric beams within the interferometer.
Incorporating a wedge prism assembly and a wedge mirror assembly.
Employing a common-path, centrosymmetric measurement structure to minimize errors.

Main Results:

Differential optical path changes due to roll are converted to phase shifts.
Cross-talk from straightness, yaw, and pitch errors is effectively avoided.
Experimental results confirm theoretical analysis, achieving sub-microradian measurement resolution.

Conclusions:

The developed roll-angle interferometer offers high sensitivity and accuracy.
The common-path and centrosymmetric design significantly enhances measurement stability and reduces errors.
This technology provides a robust solution for precise roll-angle metrology.