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Simultaneous multi-segmented mirror orientation test system using a digital aperture based on sheared Fourier

Heejoo Choi, Isaac Trumper, Matthew Dubin

|August 10, 2017

Summary

A new simultaneous multi-segmented mirror orientation test system (SMOTS) precisely measures mirror surface orientation. This advanced optical testing method achieves high accuracy for both flat and concave mirrors, enabling real-time monitoring.

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Area of Science:

Optical Engineering
Metrology
Instrumentation

Background:

Accurate measurement of mirror surface orientation is critical for optical system performance.
Existing methods may lack the speed or precision required for multi-segmented or complex mirror geometries.

Purpose of the Study:

To introduce a novel simultaneous multi-segmented mirror orientation test system (SMOTS).
To demonstrate high-accuracy, rapid orientation measurements for various mirror types.

Main Methods:

Utilized localized sheared images captured by a CMOS camera.
Employed reflected 2D sinusoidal patterns to assess mirror surface orientation.
Developed a system capable of simultaneous measurement of multiple mirror segments.

Main Results:

Achieved surface orientation measurement accuracy of 0.8 µrad for a flat mirror.
Successfully measured the orientation variation of seven mirror segments simultaneously.
Determined the orientation of two concave mirrors with an accuracy of 2.7 µrad.
Completed the measurement of seven segments in just 0.07 seconds.

Conclusions:

SMOTS provides a highly accurate and efficient method for testing mirror orientation.
The system is suitable for monitoring mirror segment orientation in real-time for diverse optical setups.
This technique advances the capabilities in optical metrology and system calibration.