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Area of Science:

  • Optical Engineering
  • Metrology
  • Space Optics

Background:

  • Scanning Hartmann test (SHT) measures sub-aperture wavefront slopes for optical systems.
  • Pointing errors in translation stages limit SHT accuracy for large-aperture systems.

Purpose of the Study:

  • To develop a novel multi-beam stitching method to correct pointing errors in SHT.
  • To enhance the accuracy and efficiency of testing large-aperture space optical systems.

Main Methods:

  • A multi-beam stitching method is proposed, integrating data from successive sub-aperture acquisitions.
  • A multi-beam array stitching test system (MASTS) was developed and applied to an 800mm space optical system.

Main Results:

  • Simulation results theoretically verified the high precision of the stitching algorithm.
  • The MASTS achieved a 1/50 λ RMS deviation from interferometric results and 1/80 λ RMS repeatability.
  • The system demonstrated high precision, repeatability, and low sensitivity to air turbulence.

Conclusions:

  • The multi-beam stitching method effectively corrects pointing errors, enabling accurate testing of large-aperture space optical systems.
  • The developed MASTS shows significant potential for future engineering applications in testing ultra-large aperture optics.