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Software configurable optical test system: a computerized reverse Hartmann test.

Peng Su1, Robert E Parks, Lirong Wang

  • 1College of Optical Sciences, The University of Arizona, Tucson, Arizona 85721, USA. psu@email.arizona.edu

Applied Optics
|August 11, 2010
PubMed
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A new software configurable optical test system (SCOTS) accurately measures large, aspherical optics. This adaptable method offers high accuracy comparable to interferometry, serving as a valuable tool for optical manufacturers.

Area of Science:

  • Optical engineering
  • Metrology
  • Instrumentation

Background:

  • Accurate measurement of large, aspherical optical components is critical for advanced applications like solar energy and astronomy.
  • Existing metrology techniques may have limitations in speed, robustness, or applicability to complex shapes.

Purpose of the Study:

  • To develop a versatile and accurate optical test system for large, highly aspherical optics.
  • To adapt deflectometry principles for broader applicability, including situations not suited for fringe illumination.

Main Methods:

  • Development of a software configurable optical test system (SCOTS) utilizing fringe reflection and phase measuring deflectometry.
  • Exploration of reverse application of traditional optical tests (Hartmann, Hartmann-Shack) using centroiding and line-scanning for slope data calculation.

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  • Leveraging geometric advantages near the center of curvature to minimize calibration needs.

    • Main Results:

    • SCOTS enables rapid, robust, and accurate measurement of large, aspherical shapes.
    • The system demonstrates a large dynamic range and accuracy comparable to interferometric methods.
    • The method is adaptable to situations where fringe illumination is impractical and can measure refractive optics.

    Conclusions:

    • SCOTS offers a powerful new tool for quantitative full-field evaluation of optical systems.
    • The system provides a valuable complement to interferometric testing, enhancing capabilities for optical manufacturers.
    • The adaptable nature of SCOTS broadens its applicability in optical testing and metrology.