Optic-electronic multi-matrix system for measuring the positions of the reflecting panels on the main mirror of the large radio-telescope

2019 ◽  
Author(s):  
Igor A. Konyakhin ◽  
Minh Hoa Tong
Keyword(s):  
Radio Telescope ◽  
Matrix System ◽  
Large Radio Telescope ◽  
Main Mirror

Non-uniform temperature distribution of the main reflector of a large radio telescope under solar radiation

2021 ◽  
Vol 21 (11) ◽  
pp. 293
Author(s):  
Shan-Xiang Wei ◽  
De-Qing Kong ◽  
Qi-Ming Wang
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Solar Radiation ◽  
Radio Telescope ◽  
Thermal Imaging ◽  
Uniform Temperature ◽  
Large Radio Telescope ◽  
Uniform Temperature Distribution ◽  
Uniform Temperature Field ◽  
Main Reflector

Abstract The non-uniform temperature distribution of the main reflector of a large radio telescope may cause serious deformation of the main reflector, which will dramatically reduce the aperture efficiency of a radio telescope. To study the non-uniform temperature field of the main reflector of a large radio telescope, numerical calculations including thermal environment factors, the coefficients on convection and radiation, and the shadow boundary of the main reflector are first discussed. In addition, the shadow coverage and the non-uniform temperature field of the main reflector of a 70-m radio telescope under solar radiation are simulated by finite element analysis. The simulation results show that the temperature distribution of the main reflector under solar radiation is very uneven, and the maximum of the root mean square temperature is 12.3°C. To verify the simulation results, an optical camera and a thermal imaging camera are used to measure the shadow coverage and the non-uniform temperature distribution of the main reflector on a clear day. At the same time, some temperature sensors are used to measure the temperature at some points close to the main reflector on the backup structure. It has been verified that the simulation and measurement results of the shadow coverage on the main reflector are in good agreement, and the cosine similarity between the simulation and the measurement is above 90%. Despite the inevitable thermal imaging errors caused by large viewing angles, the simulated temperature field is similar to the measured temperature distribution of the main reflector to a large extent. The temperature trend measured at the test points on the backup structure close to the main reflector without direct solar radiation is consistent with the simulated temperature trend of the corresponding points on the main reflector with the solar radiation. It is credible to calculate the temperature field of the main reflector through the finite element method. This work can provide valuable references for studying the thermal deformation and the surface accuracy of the main reflector of a large radio telescope.

Research on the panel adjustment method of an active main reflector for a large radio telescope

2021 ◽  
Vol 21 (2) ◽  
pp. 038
Author(s):  
Zheng-Xiong Sun ◽  
Jin-Qing Wang ◽  
Lin-Feng Yu ◽  
Wei Gou ◽  
Guang-Li Wang
Keyword(s):  
Radio Telescope ◽  
Adjustment Method ◽  
Large Radio Telescope ◽  
Main Reflector

Electronic Performance-Oriented Mold Sharing Method and Application in QTT 110 m Large Radio Telescope

2020 ◽  
Vol 68 (8) ◽  
pp. 6407-6412
Author(s):  
Shufei Feng ◽  
You Ban ◽  
Baoyan Duan ◽  
Congsi Wang ◽  
Bo Wang
Keyword(s):  
Radio Telescope ◽  
Large Radio Telescope ◽  
Electronic Performance

scholarly journals Surface adjustment strategy for a large radio telescope with adjustable dual reflectors

2019 ◽  
Vol 13 (15) ◽  
pp. 2669-2677 ◽  
Author(s):  
Peiyuan Lian ◽  
Congsi Wang ◽  
Song Xue ◽  
Qian Xu ◽  
Yu Shi ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Large Radio Telescope ◽  
Adjustment Strategy

Measurements of dynamic pointing variations of a large radio telescope

2000 ◽  
Author(s):  
David R. Smith ◽  
Timothy A. D. Paglione ◽  
Amy J. Lovell ◽  
Nobuharu Ukita ◽  
Hiroshi Matsuo
Keyword(s):  
Radio Telescope ◽  
Large Radio Telescope

scholarly journals Gain and Polarization Properties of a Large Radio Telescope from Calculation and Measurement: The John A. Galt Telescope

2016 ◽  
Vol 128 (969) ◽  
pp. 115006 ◽  
Author(s):  
X. Du ◽  
T. L. Landecker ◽  
T. Robishaw ◽  
A. D. Gray ◽  
K. A. Douglas ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Large Radio Telescope
Sign in / Sign up

Export Citation Format

Share Document