Continued Development and Testing of an Ocean Bottom Absolute Gravity Meter

P.I.：马克·祖姆伯格 提案编号：98- 20232摘要：在20世纪90年代初，PI在海洋仪器开发计划（提案#89-20058）的资助下开发了海底绝对重力仪（OBAGM）。 该系统随后于1994年、1995年和1996年在胡安·德富卡海脊部署。PI在海脊上放置了几个海底基准，并对其中三个进行了重力测量（MG G提案#94-16939）。 该计划是一个长期监测计划的开始，该计划将试图确定山脊的厘米级垂直变形。在传感器的部署过程中，以及在随后的陆地测试中，PI发现了1 mGal量级的系统误差。如果仪器在其压力箱之外操作，则测量结果与其他陆基绝对重力仪一致，这表明误差来源是传感器的机械和光学组件之间的振动耦合。虽然PI能够纠正这种系统误差，但他们建议重新设计系统以消除误差，使系统能够检测几厘米的高度变化。

P.I.: Mark Zumberg Proposal #: 98-20232Abstract:In the early 1990's the PI's developed an Ocean Bottom Absolute Gravity Meter (OBAGM) with funding from the Oceanographic Instrumentation Development program (proposal #89-20058). This system was then deployed on the Juan de Fuca ridge in 1994, 1995 and 1996. The PI's emplaced several seafloor benchmarks across the ridge and made gravity measurements on three of them (MG&G proposal #94-16939). This program was the initiation of a long-term monitoring program that will attempt to define cm-scale vertical deformation of the ridge. During deployment of the sensors, and in subsequent land tests, the PI's have discovered a systematic error on the order of 1 mGal. If the instrument is operated outside of its pressure case, the measurements agree well with other land-based absolute gravity meters, indicating that the error source is vibrational coupling between the mechanical and optical components of the sensor. Although the PI's were able to correct for this systematic error, they propose here to redesign the system to eliminate the error, enabling the system to detect height changes of a few centimeters.