arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0600astro-ph.IM
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可见光波自适应光学大变形镜驱动器设计与实验

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

摘要:

最近,自适应二级反射镜在近红外波长显示出出色的天空效果。它们目前提供30mm的致动器间距和约1kHz的带宽。推动这些设备在可见光波长下工作是一项具有挑战性的任务。与目前的系统相比,工作在红外波段的系统对空间分辨率和校正带宽的要求更高。实际上,湍流尺度更短,参数变化更快。通常,前者不大于25 mm(投影在次镜上),后者为2 kHz,因此致动器必须比当前的致动器更细长和更快。采用软磁复合材料磁芯、双定子和单动子结构的VRALA驱动器,在热影响可以忽略的情况下,获得了前所未有的性能。对输送给定冲程所需的电流进行预整形,大大简化了控制系统,控制系统的输出为电流发生器供电。由于电感取决于动子位置,因此该发电机的电子设备配备有电感测量电路,也可用作位移传感器,为控制系统提供准确的反馈信号。根据几个有限元热磁分析建立的初步原型,已经进行了一些初步的实验室测试。这些检查的结果在功率和力方面与设计结果相匹配,表明磁性设计满足严格的规格要求。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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