Adaptive secondary mirror for the 6.5-m conversion of the Multiple Mirror Telescope: first laboratory testing results
Adaptive secondary mirror for the 6.5-m conversion of the Multiple Mirror Telescope: first laboratory testing results
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用于多镜望远镜 6.5 米转换的自适应副镜：第一个实验室测试结果
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发表时间：
1999
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通讯作者：
D. Gallieni
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作者：
G. Brusa;A. Riccardi;V. Biliotti;C. del Vecchio;P. Salinari;P. Stefanini;P. Mantegazza;R. Biasi;M. Andrighettoni;C. Franchini;D. Gallieni
我们提出的第一个测试结果进行了缩小尺寸的自适应二级原型命名为P36。全尺寸单元名为MMT336，已准备好组装，计划在今年年底前将其安装在多镜望远镜的6.5米转换处。最终单元的设计包括：一个凸形薄变形镜，其形状由336个电磁力致动器控制，一个厚参考壳和用于致动器支撑和冷却的第三个铝壳。力致动器响应函数使用开环和闭环补偿来调整，以获得等效的位置致动器，这要归功于几乎共置的电容式位置传感器。数字实时控制和单元监控是使用基于DSP的定制电子设备完成的。初步的动态测试，旨在确定P36镜的响应函数，以获得适当的动态补偿是成功的。事实上，已经获得了两个主要结果：1）用于控制反射镜的前馈矩阵的准确识别2）大约0.5 ms的建立时间，完全在规格范围内。我们还补充了这些实验室的结果，从模拟的全尺寸镜动力学的结果。
We present the first results of test performed on a reduced size adaptive secondary prototype named P36. The full size unit, named MMT336, is ready to be assembled and it is planned to install it at the 6.5m conversion of the Multiple Mirror Telescope by the end of this year. The design of the final unit consists of: a convex thin deformable mirror whose figure is controlled by 336 electro-magnetic force actuators, a thick reference shell and a third aluminum shell used for actuator support and cooling. The force actuator response function is adjusted using both open and closed loop compensation to obtain an equivalent position actuator thanks to nearly co-located capacitive position sensors. The digital real-time control and the unit monitoring is done using custom-made electronics based on DSPs. The preliminary dynamical test aimed at identifying the P36 mirror response function to obtain a proper dynamics compensation were successful. In fact two main results have been obtained: 1) an accurate identification of the feedforward matrix used to control the mirror 2) settling time of approximately 0.5 ms, well within the specifications. We also complement these lab results with results obtained from simulations of the full size mirror dynamics.