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A new generation of absolute gravimeters

aricx 添加于 2010-3-19 09:42 | 3513 次阅读 | 0 个评论

作者
T. M. Niebauer, G. S. Sasagawa, J. E. Faller, R. Hilt , F. Klopping
摘要
We describe the design improvements incorporated in a new generation of absolute gravimeters, the FG5. A vertically oriented (in-line) interferometer design is used to remove the influence of floor vibration and tilt on the optical path length. The interferometer uses an iodine-stabilized laser as a primary length standard, with circuitry for automatic peak detection and locking. The seismic isolation system is an active long-period seismometer (Super Spring). The new design has improved passive isolation and thermal drift characteristics over previous systems. Programming flexibility and control of the test mass trajectory have been improved. The computer system has also improved real-time analysis and system capability. The FG5 instrument has a higher level of robustness, reliability and ease of use. These design advances have led to an instrumental uncertainty estimate of 1.1μGal. Instrument agreement among nine similar devices is 1.8μGal and observations under optimal conditions exhibit standard deviations of 5 μGal to 8 μGal.
详细资料
- 文献种类: Journal Article
- 期刊名称: metrologia
学科领域工程技术 » 测绘科学
附件
A new generation of absolute gravimeters