A Novel Tandem Differential Edge Sensor Layout for Segmented Mirror Telescopes.
A Novel Tandem Differential Edge Sensor Layout for Segmented Mirror Telescopes.
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DOI：
10.3390/s23167252
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发表时间：
2023-08-18
期刊：
影响因子：
--
通讯作者：
Liu Y
中科院分区：
文献类型：
--
作者：
Huo Y;Yang F;Wang F;Guo P;Zhu J;Liu Y
主动控制系统的性能与传感器和作动器的空间布局密切相关，对分段反射镜的共相维护至关重要。本文比较了垂直和水平两种边缘传感器布局，提出了一种新型的串联差分传感器布局，节省了布局空间，减少了定位参考的数量。从误差传播、模式表示和控制矩阵的可伸缩构造等方面分析了该方案的控制性能。最后，我们构建了一个基于串联差分的传感器检测系统，以检验边缘传感器的性能和实验室环境变量对传感器测量的影响。仿真和实验表明，该方案具有与Keck边缘传感器布局相同的能力，能够完全表征执行器的修改模式。虽然总误差乘法器略大于后者，但其可扩展控制矩阵类型较少，空间和分段形状自适应能力较强。实际测量表明，该传感器在串联差动布局下自身噪声小于20 nm，满足未来分段共相维护的要求。这种布局类型可以潜在地应用于未来的中小型分段拼接。
The performance of an active control system, crucial for the co-phase maintenance of segmented mirrors, is closely related to the spatial layout of sensors and actuators. This article compares two types of edge sensor layouts, vertical and horizontal, and proposes a novel tandem differential sensor layout that saves layout space and reduces the number of positioning references. The control performance of this scheme is analyzed in terms of error propagation, mode representation, and the scalable construction of the control matrix. Finally, we constructed a tandem differential-based sensor detection system to examine the performance of edge sensors and the effect of laboratory environmental variables on sensor measurements. Simulations and experiments demonstrate that this scheme has the same ability to fully characterize actuator modification modes as the Keck edge sensor layout. Although the total error multiplier is slightly larger than the latter, it has fewer scalable control matrix types and stronger spatial and segmental shape adaptation capabilities. Actual measurements show that the sensor’s own noise in a tandem differential layout is less than 20 nm, which meets the requirements for future segmented co-phase maintenance. This layout type can potentially be applied to future small and medium-sized segmented splices.
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