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Area of Science:

  • Optics
  • Space Technology
  • Mechanical Engineering

Background:

  • Traditional space cameras with optical zooming use moving elements, potentially destabilizing satellite momentum balance.
  • Variable resolution and field of view are crucial for flexible space-borne reconnaissance.

Purpose of the Study:

  • To develop an all-reflective optical bifocal zooming system for space cameras.
  • To eliminate the need for moving parts in optical zooming systems using a piezo deformable mirror (PDM).

Main Methods:

  • Designed and prototyped an all-reflective bifocal zooming system incorporating a PDM.
  • Investigated the PDM's ability to alter focal length by changing its curvature radius.
  • Evaluated system performance and PDM stroke within physical limits.

Main Results:

  • Achieved switchable focal lengths of 48 mm and 192 mm (4× magnification) without moving elements.
  • System performance approached diffraction-limited quality.
  • PDM's maximum stroke remained within operational physical limits.

Conclusions:

  • The piezo deformable mirror enables effective bifocal zooming in space cameras.
  • The developed system offers flexible, high-resolution reconnaissance capabilities without compromising satellite stability.
  • Experimental validation confirms the principle and successful design of the PDM-based bifocal zooming system.