Real-Time Monitoring of the Position and Orientation of a Radio Telescope Sub-Reflector with Fiber Bragg Grating Sensors

Real-Time Monitoring of the Position and Orientation of a Radio Telescope Sub-Reflector with Fiber Bragg Grating Sensors
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使用光纤布拉格光栅传感器实时监测射电望远镜副反射镜的位置和方向

DOI:
10.3390/s19030619
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发表时间:
2019-02
期刊:
Sensors (Switzerland)
影响因子:
--
通讯作者:
Bao Hong
Bao Hong
中科院分区:
其他
文献类型:
--
作者:
Zhao Yong;Du Jingli;Xu Qian;Bao Hong

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与指向误差相关的环境载荷,如重力、热梯度和风扰动,是大口径高频射电望远镜的一个严重问题。为了保持望远镜的指向性能,提出了一种基于光纤布拉格光栅应变传感器的接触式测量方案,该方案可以实时监测副反射镜位移作为调节系统的输入数据。在该方案中,采用有限元逆法推导了原位应变测量与支撑结构变形之间的关系,而支撑结构变形是引起次反射镜位移的主要原因。最后,在一个简单的物理结构模型上进行了实验研究,验证了接触测量方案的有效性和准确性。
Environmental loads linked with pointing errors, such as gravity, thermal gradients, and wind disturbances, are a serious concern for large-aperture high-frequency radio telescopes. For the purpose of maintaining the pointing performance of a telescope, a contact measurement scheme is proposed on basis of fiber Bragg grating (FBG) strain sensors that can monitor the sub-reflector shift in real time as the input data of the adjustment system. In this scheme, the relationship between the in situ strain measurement and the deformation of the supporting structure, which is the main cause of sub-reflector shift, is deduced using the inverse Finite Element Method (iFEM). Finally, experimental studies are carried out on a simple physical structure model to validate the effectiveness and accuracy of the contact measurement scheme.
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期刊: --
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