13 September 2012 The actuator design and the experimental tests of a new technology large deformable mirror for visible wavelengths adaptive optics
Author Affiliations +
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ciro Del Vecchio, Ciro Del Vecchio, Guido Agapito, Guido Agapito, Carmelo Arcidiacono, Carmelo Arcidiacono, Luca Carbonaro, Luca Carbonaro, Fabrizio Marignetti, Fabrizio Marignetti, Enzo De Santis, Enzo De Santis, Valdemaro Biliotti, Valdemaro Biliotti, Armando Riccardi, Armando Riccardi, } "The actuator design and the experimental tests of a new technology large deformable mirror for visible wavelengths adaptive optics", Proc. SPIE 8447, Adaptive Optics Systems III, 844708 (13 September 2012); doi: 10.1117/12.926184; https://doi.org/10.1117/12.926184
PROCEEDINGS
10 PAGES


SHARE
RELATED CONTENT

Performance of a magnetic driven tip-tilt mirror
Proceedings of SPIE (March 21 1997)
High-order adaptive secondary mirrors: where are we?
Proceedings of SPIE (September 11 1998)
Thermal deformable mirror
Proceedings of SPIE (June 27 2006)
Adaptive secondary mirrors for the Large Binocular Telescope
Proceedings of SPIE (February 07 2003)

Back to Top