Tonino Pisanu, Franco Buffa, M. Morsiani, Claudio Pernechele, S. Poppi,
... bearing and on the central part of the alidade structure; b) a non contact laser alignment optical ... position; c) twenty thermal sensors mounted on the alidade trusses. Two series of measurements were made, the ... on the South and North sides of the alidade, thus indicating that the inclinometers track well the thermal deformation of the alidade. When the antenna pointed at the source we measured: pointing errors, the inclination of the alidade, the temperature of the alidade components and the subreflector position. The pointing errors ...
Tópico(s): Astronomical Observations and Instrumentation
2010 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Tonino Pisanu, Franco Buffa, S. Poppi, P. Marongiu, G. Serra, Gian Paolo Vargiu, R. Concu,
... inclinometer chosen to be installed on the SRT alidade. This is a commercial device which basically uses ... was installed on the plane of the SRT alidade close to the antenna elevation axis to measure ... and to the temperature gradient effects on the alidade steel beams. Last summer some tests were carried ...
Tópico(s): Railway Engineering and Dynamics
2014 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Shan-Xiang Wei, Deqing Kong, Qiming Wang,
Abstract The alidade’s non-uniform temperature field of a large radio telescope is very obvious under solar radiation. Estimating a radio telescope’s pointing errors, caused by the alidade deformation under solar radiation, is significant to improve ... pointing accuracy. To study the effect of the alidade thermal behavior on the pointing accuracy of a ... measured results, the temperature distribution rule of the alidade is summarized initially. In addition, the alidade’s temperature field is calculated by finite element ...
Tópico(s): Antenna Design and Optimization
2021 - IOP Publishing | Research in Astronomy and Astrophysics
W. Gawroński, F. Baher, E. Gama,
... table consists of three axis rotations of the alidade as a function of the azimuth position. The ... measurement data, and determination of the three-axis alidade rotations from the tilt data. It also presents ... of the antenna as a function of the alidade rotations. The pointing accuracy of the antenna with ...
Tópico(s): Advanced Measurement and Metrology Techniques
2006 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Fu Li, Quan B. Ling, Xu G. Geng, Jin Q. Wang, Yong B. Jiang, Lin F. Yu, Yi F. Zhang,
Aimed at the alidade of TM65m antenna, the distributions of temperature field and effects of thermal deformations on pointing accuracy were analyzed based on thermometers and inclinometer. The alidade temperature and cross-elevation tilt were recorded for ... seems that the elevation offset caused by the alidade temperature variation is more than 20 arcsec from ...
Tópico(s): Radio Astronomy Observations and Technology
2016 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Alessandro Attoli, Flavio Stochino, Franco Buffa, S. Poppi, G. Serra, G. Sanna, Antonio Cazzani,
... analysis it was possible to establish that the Alidade is the radio telescope component that produces higher ... was used to estimate the temperature of the Alidade trusses exposed to solar radiation. Furthermore, the calibration ...
Tópico(s): Structural Analysis and Optimization
2022 - Elsevier BV | Structures
Tonino Pisanu, Franco Buffa, R. Concu, P. Marongiu, M. Pili, S. Poppi, G. Serra, Enrico Urru, Gianpaolo Vargiu,
... system: an electronic inclinometer able to monitor the alidade deformations and a Position Sensing Device (PSD) able ... axis inclination and the thermal effects on the alidade structure. The PSD will be used to measure ...
Tópico(s): Adaptive optics and wavefront sensing
2014 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Tonino Pisanu, Franco Buffa, G. L. Deiana, P. Marongiu, M. Morsiani, Claudio Pernechele, S. Poppi, G. Serra, Giampaolo Vargiu,
... system: an electronic inclinometer able to monitor the alidade deformations and a Position Sensing Device (PSD) able ... axis inclination and the thermal effects on the alidade structure. The PSD will be used to measure ... recorded by a dedicated PC installed in the Alidade equipment room and connected to the sensors via ...
Tópico(s): Astronomical Observations and Instrumentation
2012 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Anthony R. Philpotts, Norman H. Gray, Maureen Carroll, Randolph P. Steinen, John B. Reid,
... mapping such as that done previously with an alidade and plane table, the instrument offers the possibility ... training to master than does a transit or alidade. Based on our brief experience with the electronic ...
Tópico(s): Geochemistry and Geologic Mapping
1997 - Taylor & Francis | Journal of Geoscience Education
Qian Xu, Fei Xue, Hui Wang, Letian Yi,
... telescopes is the deformation and tilt of antenna alidades, which primarily result from track unevenness and thermal ... installed to investigate the tilt of the antenna alidade and the pointing errors caused thermally. An environment ... accuracy of the inclinometer. The tilt of the alidade caused by the track unevenness was measured by ...
Tópico(s): Astronomical Observations and Instrumentation
2023 - Multidisciplinary Digital Publishing Institute | Micromachines
Shufei Feng, Congsi Wang, Baoyan Duan, You Ban,
... structure are presented further. Then, a novel Reflector-Alidade Connecting Structure (RACS) scheme for large telescope is ...
Tópico(s): Antenna Design and Optimization
2017 - Elsevier BV | Acta Astronautica
... design including antenna weight vs. stiffness, reflector and alidade connecting, reflector surface dividing, actuator, azimuth track, etc. ...
Tópico(s): Antenna Design and Analysis
2016 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Lowell Dingus, David B. Loope, Demberlyin Dashzeveg, Carl C. Swisher, Chuluun Minjin, Michael J. Novacek, Mark A. Norell,
... features are also mapped by plane table and alidade.Five lithologic and sedimentologic facies are described: E- ...
Tópico(s): Geological formations and processes
2008 - American Museum of Natural History | American Museum Novitates
... London. 1. Ordnance. London. Bowden, M., 2002, With Alidade and Tape: Graphical and plane table survey of ...
Tópico(s): Archaeology and ancient environmental studies
2005 - Taylor & Francis | The International Journal of Nautical Archaeology
... are: manufacturing, erection of stiffness driven space trusses (alidade and backup structure), main axes mechanisms (elevation, azimuth), ...
Tópico(s): Business, Education, Mathematics Research
2004 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Hans J. Kaercher, J. W. M. Baars,
... main axis drives and active surface control, the alidade with the large receiver rooms and excellent access ...
Tópico(s): Astronomy and Astrophysical Research
2000 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Peter Eisentraeger, Martin Süess,
... inclinometer system for measuring the deformations of the alidade. For compensating the monitored deformations, the telescope is ...
Tópico(s): Adaptive optics and wavefront sensing
2000 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Roberto Ambrosini, G. Grueff, M. Morsiani, G. Maccaferri, P. Zacchiroli, A. Orfei,
Tópico(s): Radio Astronomy Observations and Technology
1996 - Springer Science+Business Media | Astrophysics and Space Science
Acoustic Surveys, Marine. Aerial Surveys. Alidade. Alluvial Systems Modeling. Artificial Deposits and Modified Land. Atmogeochemical Prospecting. Augers, Augering (Soil). Biogeochemistry. Blasting and Related Technology. Block Diagram. Blowpipe ...
Tópico(s): Geochemistry and Geologic Mapping
1988 - Association of College and Research Libraries | Choice Reviews Online
Wei‐Qi Zhang, Jiao Decheng, Zhang Peizhen, Péter Molnár, B. C. Burchfield, Qidong Deng, Yipeng Wang, Song Fangmin,
Abstract We used a plane table and an alidade to construct detailed topographic maps of offset features ( ...
Tópico(s): Earthquake Detection and Analysis
1987 - Seismological Society of America | Bulletin of the Seismological Society of America
Carl Fríes, Celedonio Guttiérrez,
... on the rim of tie cone, using an alidade at known stations, and in addition followed the ...
Tópico(s): Species Distribution and Climate Change
1950 - American Geophysical Union | Transactions American Geophysical Union
... with a long pendulum using an electronic recording alidade are presented. A gain in precision over traditional ...
Tópico(s): Mechanical and Optical Resonators
2017 - EDP Sciences | The European Physical Journal Applied Physics
Fernando Bessa Ribeiro, Octávio Sacramento,
... natureza, da cultura e até mesmo da sexualidade, promovendo-as por via das tecnologias e das ...
Tópico(s): Sex work and related issues
2009 - | Configurações
Produção Nacional
... preocupados em compreender, explicar e transformar a re-alidade social. Temperada no aco, no mesmo passo do ...
Tópico(s): Youth, Politics, and Society
2017 - Fundação Oswaldo Cruz, Escola Politécnica de Saúde Joaquim Venâncio | Trabalho Educação e Saúde
... was 54° 30′ west from magnetic north. An alidade tower was built and permanently centered over a ... the highest point of the mound. A telescopic alidade and stadia rod were used to determine all ...
Tópico(s): Geotechnical and construction materials studies
1949 - Cambridge University Press | Memoirs of the Society for American Archaeology
Shanxiang Wei, Deqing Kong, Fangwei Jin, Bin Xiong, Cong Lei, Binlan Wang,
... the influence of the thermal behavior of the alidade. These findings could provide valuable references for the ...
Tópico(s): Laser and Thermal Forming Techniques
2023 - SPIE | Journal of Astronomical Telescopes Instruments and Systems
... intervals by a fathometer, and plane table and alidade. Of 36 pairings among nine morphologic elements, seven ...
Tópico(s): Geological formations and processes
1983 - Wiley | Earth Surface Processes and Landforms
... it has been supporting the weight of the alidade, and some initial rotations of the structure have ...
Tópico(s): Radio Astronomy Observations and Technology
2006 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Dehua Yang, Shuangshuo Xue, Daxing Wang, Wenzhi Lu, Jingquan Cheng,
... back-up structure, this paper presents the special alidade layout, driving system, structural and wind hazard analyses, ...
Tópico(s): Radio Astronomy Observations and Technology
2003 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Yong Sam Lee, Sang Hyuk Kim, Byeong‐Hee Mihn,
... time of night through three rings and an alidade. One such instrument, the Simplified Time-Determining Instrument ( ...
Tópico(s): Historical Astronomy and Related Studies
2016 - Korean Space Science Society (KSSS) | Journal of Astronomy and Space Sciences