| 报告题目： |
Large Ring Laser Technology |
| 报告人： |
Ulrich Schreiber |
| 报告人单位： |
Technische Universitaet Muenchen
Forschungsreinrichtung Satellitengeodaesie
Geodetic Observatory Wettzell |
| 报告时间： |
2018年5月30日 15:00 |
| 报告地点： |
引力中心三楼会议室 |
| 报告摘要： |
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Over the last two decades a series of large ring laser gyroscopes have been built having an unparalleled scale factor. These upscaled devices have improved the sensitivity and stability for rotation rate measurements by six orders of magnitude when compared to previous commercial developments. This progress has made possible entirely new applications of ring laser gyroscopes in the fields of geophysics, geodesy, and seismology. Ring lasers are currently the only viable measurement technology, which is directly referenced to the instantaneous rotation axis of the Earth. The sensor technology is rapidly developing. This is evidenced by the first experimentally viable proposals to make terrestrial tests of general relativistic effects such as the frame dragging of the rotating Earth. The current ring lasers have measured diurnal polar motion as well as the more recent observation of the Chandler and Annual wobbles. We expect that in the near future, geophysical signals with very long periods will become detectable. This will eventually make significant contributions to the field of space geodesy. At the same time, ring laser measurements of variations in the LoD are expected to become comparable to those made using VLBI and the combination of gyroscope and VLBI measurements will significantly contribute to the maintenance of the geodetic reference frames. |
| 报告人简介： |
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Karl Ulrich Schreiber received his Ph.D. in applied physics in Göttingen in 1988. Since then he works for the Technische Universitaet Muenchen (TUM) in the field of Space Geodesy. His interests are in Satellite and Lunar Laser Ranging (SLR/LLR) and in particular in Sagnac Interferometry, which is applied to the highly resolved monitoring of Earth Rotation variations. His large ring laser gyroscopes seeded the research on rotations in seismology. He habilitated in 1999 and is Professor (extraordinary) at the Forschungseinrichtung Satellitengeodaesie and an adjunct Professor at the University of Canterbury in Christchurch, New Zealand. He received the Huygens research medal (for significant progress in geoscientific instrumentation) of the European Geoscience Union in 2016. |
