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Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

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Dynamic response of ferrofluidic deformable mirrors.

Jocelyn Parent1, Ermanno F Borra, Denis Brousseau

  • 1Département de Physique, Génie Physique et Optique and Centre d'Optique, Photonique et Laser, Université Laval, Québec, Québec G1V 0A6, Canada.

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|December 25, 2008
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Summary

Increasing ferrofluid viscosity enhances deformable mirror operational frequency. This breakthrough, coupled with actuator overdriving, enables adaptive optics corrections up to 900 Hz, overcoming previous limitations.

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Area of Science:

  • Optics
  • Materials Science
  • Fluid Dynamics

Background:

  • Ferrofluids offer unique properties for deformable mirrors, including large stroke and low cost.
  • Previous ferrofluid deformable mirrors were limited to low operational frequencies (<10 Hz).

Purpose of the Study:

  • To investigate the impact of ferrofluid viscosity on deformable mirror operational frequency.
  • To explore methods for overcoming limitations in ferrofluid deformable mirror performance.

Main Methods:

  • Tested ferrofluids with viscosities up to 494 cP.
  • Implemented an actuator overdriving technique using pulsed and step functions.
  • Evaluated mirror response for adaptive optics correction.

Main Results:

  • Increased ferrofluid viscosity significantly raised the operational frequency.
  • Achieved adaptive optics correction frequencies as high as 900 Hz.
  • Actuator overdriving compensated for amplitude loss caused by high viscosity.

Conclusions:

  • Ferrofluid deformable mirrors can operate at much higher frequencies than previously thought.
  • Higher viscosity ferrofluids and actuator overdriving are key to achieving high-frequency adaptive optics.
  • Integration into closed-loop systems at ~500 Hz is feasible.