报告题目:Acceleration noise sources in drag-free spacecraft


    Geodesic motion is at the core of numerous space-borne experimental tests of Gravity and Fundamental Physics. Tests of the Equivalence Principle and the Gravitational Inverse Square Law, the identification of the nature of the Pioneer Anomaly, measurements of the Gravitational Constant and its spatial-temporal variations, tests of relativistic gravity, i.e., light deflection and light retardation, geodesic deviation and Lense-Thirring effect, and the detection and measurement of gravitational waves, are within the most fundamental experimental searches in Gravitation. To perform such tests, proof masses in free fall are generally required. The technique to place a proof mass in geodesic/free-fall motion is known as drag-free technology. In this seminar, I will summarize the different sources of acceleration noise in drag-free spacecraft. The performance of drag-free spacecraft will be ultimately limited by the uncompensated gravitational field and gravity field gradient of the spacecraft structure and payload. We identify sources of disturbance of gravitational origin and we explore a new concept for determining gravitational fields in the vicinity of the proof mass.

    报告人:Dr. Antonio Pulido Patón


    Antonio Pulido Patón, graduated in Fundamental Physics at Universidad Complutense of Madrid in June 1997. From 1997 to year 2000, he studied in the Department of Particles, Fields, and Cosmology at the Mathematics and Fundamental Physics Institute (IMAFF) of Consejo Superior de Investigaciones Cientificas (Spanish Research Council, CSIC), doing research on the topic of Gauge Theories of Gravity. From June 2000 to August 2004, he conducted his PhD research studies in the Experimental Gravitational Physics Research Group at the Department of Physics and Astronomy at the University of Birmingham. In Birmingham University, he acquired expertise in Cryogenic Superconducting Torsion Balances for the purpose of weak force physics measurements. Currently, and partially as a result of this research work, he and colleagues at the University of Birmingham hold best world current constraints at short ranges (millimiters) for forces connecting intrinsic spin and mass. After his PhD graduation, during the spring of 2005, he moved as a postdoctoral student to Purple Mountain Observatory (PMO), CAS. Since 2007, he became associate researcher in PMO. During this period of time he has been doing research work in topics related to the project ASTROD (Astrodynamical Tests of Relativity using Optical Devices), a multipurpose space mission for testing Relativistic Gravity and detecting low frequency Gravitational Waves.

    报告会时间:2009年11月17日 下午14:30

    地 点:力学所综合楼(2号楼)301会议室



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