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An Electromagnetic-Driven Microshutter Array in a Field-of-View Gated Image System for All-Time Star Sensors.

Liang Fang1,2,3, Weimin Wang4, Qiang Wang1

  • 1Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.

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A novel electromagnetic microshutter array enables all-time star sensors to detect multiple stars by rapidly gating the field of view (FOV). This technology improves star pattern recognition and daytime astronomical navigation.

Keywords:
electromagnetic actuationfield of view gatedmicroshutter array

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Area of Science:

  • Aerospace Engineering
  • Optoelectronics
  • Applied Physics

Background:

  • All-time star sensors require advanced imaging systems to overcome limitations like background radiation and single-star detection.
  • Field of view (FOV) gating is crucial for enhancing star sensor performance in various conditions.

Purpose of the Study:

  • To design and develop a microshutter array with large unit size, high duty cycle, and fast response speed for FOV-gated imaging systems.
  • To enable all-time star sensors to perform multi-star detection and improve navigation capabilities.

Main Methods:

  • Electromagnetic actuation principle utilizing magnetic force on a current-carrying coil to deflect a light barrier.
  • Analysis of coil element parameters affecting magnetic force torque, torsion beam resistance torque, and switch response time.
  • Fabrication and testing of a microshutter array sample with a 4-mm period and 2.8-mm aperture.

Main Results:

  • Demonstrated effective switching function of the microshutter array.
  • Achieved a switch response time of approximately 2.5 ms for individual microshutter elements.
  • Validated the capability to gate an instantaneous small FOV for background radiation suppression.

Conclusions:

  • The designed electromagnetic microshutter array meets the application requirements for FOV-gated imaging systems in all-time star sensors.
  • This technology facilitates multi-star detection by rapidly switching the gated FOV, overcoming limitations of traditional star trackers.
  • Promotes all-time star sensors for daytime astronomical navigation and star pattern recognition.