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26 April 2024 |
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The Actuator Design and the Experimental Tests of a New Technology Large Deformable Mirror for Visible Wavelengths Adaptive Optics | | Ciro Del Vecchio
; Guido Agapito
; Carmelo Arcidiacono
; Luca Carbonaro
; Fabrizio Marignetti
; Enzo De Santis
; Valdemaro Biliotti
; Armando Riccardi
; | | Date: |
4 Sep 2012 | | Abstract: | Recently, Adaptive Secondary Mirrors showed excellent on-sky results in the
Near Infrared wavelengths. They currently provide 30mm inter-actuator spacing
and about 1 kHz bandwidth. Pushing these devices to be operated at visible
wavelengths is a challenging task. Compared to the current systems, working in
the infrared, the more demanding requirements are the higher spatial resolution
and the greater correction bandwidth. In fact, the turbulence scale is shorter
and the parameter variation is faster. Typically, the former is not larger than
25 mm (projected on the secondary mirror) and the latter is 2 kHz, therefore
the actuator has to be more slender and faster than the current ones. With a
soft magnetic composite core, a dual-stator and a single-mover, VRALA, the
actuator discussed in this paper, attains unprecedented performances with a
negligible thermal impact. Pre-shaping the current required to deliver a given
stroke greatly simplifies the control system, whose output supplies the current
generator. As the inductance depends on the mover position, the electronics of
this generator, provided with an inductance measure circuit, works also as a
displacement sensor, supplying the control system with an accurate feed-back
signal. A preliminary prototype, built according to the several FEA
thermo-magnetic analyses, has undergone some preliminary laboratory tests. The
results of these checks, matching the design results in terms of power and
force, show that the the magnetic design addresses the severe specifications. | | Source: | arXiv, 1209.0600 | | Services: | Forum | Review | PDF | Favorites | |
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