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- Title
Real-Time Monitoring of the Position and Orientation of a Radio Telescope Sub-Reflector with Fiber Bragg Grating Sensors.
- Authors
Zhao, Yong; Du, Jingli; Xu, Qian; Bao, Hong
- Abstract
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.
- Subjects
RADIO telescopes; FIBER Bragg gratings; THERMAL gradient measurment; REFLECTING telescopes; STRAINS &; stresses (Mechanics)
- Publication
Sensors (14248220), 2019, Vol 19, Issue 3, p619
- ISSN
1424-8220
- Publication type
Article
- DOI
10.3390/s19030619