中国科学院机构知识库网格系统: 检索

Real-time temperature estimation method for electromagnetic performance improvement of a large axisymmetric radio telescope under solar radiation 期刊论文 OAI收割
Iet Microwaves Antennas & Propagation, 2020, 卷号: 14, 期号: 13, 页码: 1635-1642
作者: Lian, Peiyuan; Wang, Congsi; Xu, Qian; Xiang, Binbin; Shi, Yu

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收藏 | 浏览/下载：43/0 | 提交时间：2021/06/25

radiotelescopes temperature sensors reflector antennas solar radiation temperature database table look-up method temperature field estimation speed real-time estimated temperature field temperature sensors real-time compensation axisymmetric telescopes time temperature estimation method electromagnetic performance improvement axisymmetric radio telescope solar radiation electromagnetic performances EM performance improvements temperature simulation fast estimation method transient temperature field simulation high-frequency radio telescopes large-aperture radio telescopes reflector antenna reflector antennas surface error adjustment pattern field Engineering Telecommunications

Study of the impact of co-phasing errors for segmented primary mirror using nonlinear analysis 期刊论文 OAI收割
Optik, 2019, 卷号: 191, 页码: 80-88
作者: H.S.Yang; X.J.Zhang; Z.L.Li; X.K.Wang; M.M.Xu

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收藏 | 浏览/下载：41/0 | 提交时间：2020/08/24

Ultra large aperture,Space-based telescope,Segmented primary mirro,Co-phasing error,Wavefront deformation,piston error,telescopes,Optics

The black hole at the Galactic Center: Observations and models 期刊论文 OAI收割
INTERNATIONAL JOURNAL OF MODERN PHYSICS D, 2018, 卷号: 27, 期号: 6, 页码: 15
作者: Zakharov, Alexander F.

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收藏 | 浏览/下载：17/0 | 提交时间：2020/03/10

Black holes supermassive black holes gravitational lensing the Galactic Center large telescopes VLBI interferometry graviton mass theories of massive gravity

Ritchey-Common sparse-aperture testing of the Giant Steerable Science Mirror 期刊论文 OAI收割
Applied Optics, 2018, 卷号: 57, 期号: 27, 页码: 7764-7769
作者: An, Q. C.; Zhang, J. X.; Yang, F.; Zhao, H. C.; Cao, H. F.

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收藏 | 浏览/下载：15/0 | 提交时间：2019/09/17

point-source sensitivity large telescopes stitching test error calibration Optics

Quality control of mass production of PMT modules for DAMPE 期刊论文 OAI收割
JOURNAL OF INSTRUMENTATION, 2017, 卷号: 12, 页码: 13
作者: Dong, J. N.; Zhang, Y. L.; Zhang, Z. Y.; Wei, Y. F.; Wu, L. B.

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收藏 | 浏览/下载：21/0 | 提交时间：2019/04/08

Calorimeters Gamma telescopes Large detector systems for particle and astroparticle physics

Possible Alternatives to the Supermassive Black Hole at the Galactic Center 期刊论文 OAI收割
JOURNAL OF ASTROPHYSICS AND ASTRONOMY, 2015, 卷号: 36, 期号: 4, 页码: 539-553
作者: Zakharov, A. F.

收藏 | 浏览/下载：22/0 | 提交时间：2016/10/31

Black holes supermassive black holes gravitational lensing the Galactic Center large telescopes VLBI interferometry

Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文 OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者: Zhang L.; Zhang L.

收藏 | 浏览/下载：62/0 | 提交时间：2013/03/25

The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope the structure should have high stiffness and high reliability and light weight. Compared with invar aluminum alloy and titanium alloy carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages such as ultra-light weight high stiffness and dimensional stability etc. The optimization method and the baffle design can be helpful to other coaxial telescopes such as Cassegrain Gregorian and their subdivisions. 2012 IEEE.

Design and experimental research of a new type focus mechanism used in space-based telescope (EI CONFERENCE) 会议论文 OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者: Wang D.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

The position of focal plane will be changed because of temperature fluctuation and vacuum environment. In order to make the telescope work well positioning accuracy of the mechanism is 0.008mm. The performance satisfies the need of precision a focusing mechanism is needed. To majority of large space-based telescopes and the scheme design is reasonable and practicable. 2012 IEEE. the general way to do this would be to use a reflector which was located in the backfocal distance. One of typical schemes of this mechanism was introduced however because of the big axial size the mechanism can't be used when the size of the enclosure was limited. A new type of focusing mechanism was introduced which has such advantages of small size high accuracy and low mass. The design and test methods had been discussed. According to the results the repeatability positioning accuracy is 0.0025mm

The simulation of the local seeing in segments active alignment 会议论文 OAI收割
Conference on Integrated Modeling of Complex Optomechanical Systems, Kiruna, SWEDEN, 2011-08-15
作者: Yuan S(袁沭); Lin J(林京); Lin J(林京); Yuan S(袁沭)

收藏 | 浏览/下载：14/0 | 提交时间：2016/04/06

Extremely Large Telescopes active control Internal optical metrology Local seeing

Study on the azimuth bearing scheme of a large Alt-azimuth telescope (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者: Wang H.; Dai S.; Zhang J.; Wang H.; Zhang J.

收藏 | 浏览/下载：39/0 | 提交时间：2013/03/25

The azimuth bearing schemes in typical large Alt-azimuth telescopes especially the 3.5-m APO telescope and the 4.1-m SOAR telescope were analyzed. A scheme of high-angular contacted thrust ball bearing integrated with a radial ball bearing was put forward. According to the Hertz contact theory the corresponding parameters were designed for engineering application. The static performance parameters within the range of 60 85 original contact angle were calculated. Compared with the traditional plane thrust ball bearing the results shows that the high-angular (80) contact thrust ball bearing has more benefits at bearing strength and rigidity for large telescope. The 1500mm diameter prototyping bearing shows good performance including the axial jitter is 0.009mm the radial jitter is 0.006mm the maximum starting torque without load is 30N·m and the load capacity is more than 30t which offers advanced technique path for the buildup of the high precision azimuth shafting and the whole telescope system. 2010 Copyright SPIE - The International Society for Optical Engineering.