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Related Experiment Video

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Measurement of picometer-scale mirror dynamics.

Babak Saif, David Chaney, Perry Greenfield

    Applied Optics
    |October 20, 2017
    PubMed
    Summary
    This summary is machine-generated.

    A new high-speed interferometer precisely measures the dynamic motions of the James Webb Space Telescope primary mirror. This advanced system reliably detects picometer-level displacements, crucial for optical performance.

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    Area of Science:

    • Optical Engineering
    • Astrophysical Instrumentation
    • Precision Metrology

    Background:

    • The James Webb Space Telescope (JWST) requires precise alignment of its segmented primary mirror.
    • Dynamic motions can impact the optical performance and stability of the mirror system.
    • Accurate measurement of these dynamics is essential for mission success.

    Purpose of the Study:

    • To design and build a high-speed interferometer for measuring JWST primary mirror dynamics.
    • To characterize the system's capability in tracking large absolute motion (piston) and dynamic effects.
    • To detail the test setup, data processing, and motion detection algorithms.

    Main Methods:

    • Development of a high-speed interferometer system.
    • Implementation of a data acquisition and processing system.
    • Application of algorithms to distill dynamic motions from interferometric data.

    Main Results:

    • The interferometer successfully measures large absolute motion (piston) of the mirror surface.
    • Preliminary tests demonstrate reliable detection of dynamic effects at the tens of picometer level.
    • The system is capable of tracking displacements over orders of magnitude of wavelengths.

    Conclusions:

    • The designed high-speed interferometer is a viable tool for measuring JWST primary mirror dynamics.
    • The developed technique offers high precision for characterizing dynamic effects.
    • Potential applications include mirror system calibration, stability analysis, and future optical instrument development.