公开(公告)号：WO98057197A1

公开(公告)日：1998-12-17

申请号：PCT/AU1998/000441

申请日：1998-06-11

IPC: G01V7/16 ,  G01V7/02 ,  G01V7/04

CPC classification number: G01V7/16

Abstract: The invention concerns improvements in the performance of a mobile gravity gradient instrument (GGI). Gravity gradiometers measure one or more components of the gradient of gravity which is expressed as the gradient of a gravity vector, or in other words a tensor. The instrument comprises a first, second, third and fourth accelerometer (1, 2, 3, 4) equally spaced around the circumference of a circle, with their sensitive axes tangential to the circle, and arranged in opposing pairs with the first accelerometer opposite the second and the third accelerometer opposite the fourth. In use the accelerometers are spun around an axis (6) normal to the circle which passes through its centre. A summing amplifier receives the outputs of the accelerometers and combines them in a manner to cancel the common mode output signals and so produces an instrument output. One or more feedback loops extend from the instrument output to one or more of the accelerometers to compensate for errors. In general, the invention embraces the concept of balancing any feedback signal so that it is applied after appropriate division (if required), to two or more of the accelerometers in appropriately inverted senses, rather than being applied to a single accelerometer.

Abstract translation: 本发明涉及移动式重力梯度仪（GGI）的性能改进。 重力梯度计测量重力梯度的一个或多个分量，其表示为重力向量的梯度，或换句话说是张量。 该仪器包括围绕圆周等距间隔的第一，第二，第三和第四加速度计（1,2,3,4），其敏感轴与圆相切，并且与第一加速度计相对地布置 第二和第三加速度计相对于第四。 在使用中，加速度计围绕通过其中心的圆的法线（6）旋转。 加法放大器接收加速度计的输出并以它们的方式组合它们以消除共模输出信号，从而产生仪器输出。 一个或多个反馈回路从仪器输出延伸到一个或多个加速度计以补偿误差。 通常，本发明包括平衡任何反馈信号的概念，使得其在适当地分解（如果需要）之后被应用于适当反转的感测中的两个或更多个加速度计，而不是应用于单个加速度计。

公开(公告)号：WO98057196A1

公开(公告)日：1998-12-17

申请号：PCT/AU1998/000442

申请日：1998-06-11

IPC: G01P15/125 ,  G01P15/13 ,  G01P21/00 ,  G01V7/04 ,  G01V7/02

CPC classification number: G01P15/132 ,  G01P15/125 ,  G01P21/00 ,  G01V7/04

Abstract: This invention concerns improvements to gravity gradient instruments (GGI) and in particular to the accelerometers that are paired within these instruments. Accelerometers (1) have a proof mass (2) suspended by a spring (3) within a magnetic field. An internal feedback loop (6) provides a signal related to movement of the proof mass back through a reaction coil (7) retaining the proof mass in the magnetic field, to maintain the proof mass stationary. An external feedback loop (17) adjusts the accelerometer scale factor. The internal feedback loop provides second order compensation to the proof mass and the spring stiffness. In a further aspect the invention is a method of matching accelerometer pairs.

Abstract translation: 本发明涉及对重力梯度仪器（GGI）的改进，特别涉及在这些仪器内配对的加速度计。 加速度计（1）具有在磁场内由弹簧（3）悬挂的检验质量（2）。 内部反馈回路（6）提供与证明质量块的运动相关联的信号，该信号通过将检测质量块保持在磁场中的反应线圈（7）保持反射质量的稳定。 外部反馈回路（17）调整加速度计比例因子。 内部反馈回路为检验质量和弹簧刚度提供二阶补偿。 在另一方面，本发明是一种匹配加速度计对的方法。

公开(公告)号：WO2019190504A1

公开(公告)日：2019-10-03

申请号：PCT/US2018/024900

申请日：2018-03-28

Applicant: HALLIBURTON ENERGY SERVICES, INC.

Inventor： RODNEY, Paul F. ,  STARK, Daniel Joshua

IPC: G01V13/00 ,  G01V7/02

Abstract: A method and system for in-sit calibration of a gravimeter. A method may comprise disposing a downhole tool in a borehole, wherein the downhole tool comprises the gravimeter attached to a linear actuator, recording a first set of measurements with the gravimeter while the linear actuator is stationary, activating the linear actuator, recording a second set of measurements with the gravimeter, and calibrating the gravimeter based on the first and second set of recorded measurements. A system may comprise a downhole tool, a conveyance, and an information handling system. The downhole tool may further comprise a hanger, a sonde, connected to the hanger, a linear actuator, connected to the hanger, and a shaft, connected to the linear actuator. The downhole tool may further comprise a linkage, connected to the shaft, a package, connected to the linkage, and a gravimeter, disposed in the package.

公开(公告)号：WO2016019020A1

公开(公告)日：2016-02-04

申请号：PCT/US2015/042666

申请日：2015-07-29

Applicant: BAKER HUGHES INCORPORATED

Inventor： CSUTAK, Sebastian

IPC: E21B47/00 ,  G01V7/02 ,  E21B49/00

CPC classification number: G01V7/04

Abstract: An apparatus for estimating gravitational properties includes an optical source, a first interferometer including a fixed reference reflector and a first reflector coupled to a first moveable mass, a second interferometer including the fixed reference reflector and a second reflector coupled to a second moveable mass, a first detector configured to detect a first interference pattern generated by the first interferometer, and a second detector configured to detect a second interference pattern generated by the second interferometer. The first mass is configured to move a first amount in response to a change in gravitational force, and the second mass is configured to move a second amount in response to a change in gravitational force, the second amount being smaller than the first amount. The apparatus also includes a processor configured to estimate the change in gravitational force based on a combination of the first and second interference patterns.

Abstract translation: 用于估计重力特性的装置包括光源，包括固定参考反射器的第一干涉仪和耦合到第一可移动质量块的第一反射器，包括固定参考反射器的第二干涉仪和耦合到第二可移动质量块的第二反射器， 第一检测器，其被配置为检测由所述第一干涉仪产生的第一干涉图案;以及第二检测器，被配置为检测由所述第二干涉仪产生的第二干涉图案。 第一质量块构造成响应于重力的变化而移动第一量，并且第二质量被配置为响应于重力的变化而移动第二量，第二量小于第一量。 该装置还包括配置成基于第一和第二干涉图案的组合来估计重力变化的处​​理器。

公开(公告)号：WO2015103608A1

公开(公告)日：2015-07-09

申请号：PCT/US2015/010318

申请日：2015-01-06

Applicant: LOCKHEED MARTIN CORPORATION ,  MEYER, Thomas J.

Inventor： MEYER, Thomas J.

IPC: G01V7/00 ,  G01V7/02 ,  G01V7/08 ,  G01V7/16

CPC classification number: G01V7/16 ,  F16C32/0614 ,  F16C32/0696 ,  F16C2370/00 ,  G01V7/04 ,  G01V7/08

Abstract: A non-contacting spherical air bearing-based stable platform for use by a gravity gradiometer instrument (GGI) is provided by attaching a spherical ball-shaped bearing to a rotational stage of the GGI and integrating a concave spherical cup in the linear stage and mounting base assembly of the GGI which is fixedly attached to a host vehicle or platform. The spherical cup supports the spherical ball-shaped bearing on a thin cushion of air provided by a source of compressed air or gas at the concave surface of the spherical cup. The spherical ball-shaped bearing is supported, providing three degrees of rotational freedom of motion without the need for slip rings, flex capsules, races, or mechanical bearings, thereby reducing or eliminating gradient disturbance signals owing to parasitic torques and jitter in the output of the accelerometers of the GGI.

Abstract translation: 通过将球形球形轴承安装到GGI的旋转台上，并将凹球面杯整合到线性平台中并安装在一起，提供了一种用于重力梯度计（GGI）的非接触球形空气轴承的稳定平台 GGI的基座组件固定地连接到主车辆或平台。 球形杯将球形球轴承支撑在由球形杯的凹面处的压缩空气或气体源提供的薄的空气缓冲垫上。 支撑球形球形轴承，提供三度的旋转运动自由度，而不需要滑环，柔性胶囊，座圈或机械轴承，从而减少或消除由于寄生扭矩和输出中的抖动引起的梯度扰动信号 GGI的加速度计。

公开(公告)号：WO2021253487A1

公开(公告)日：2021-12-23

申请号：PCT/CN2020/099246

申请日：2020-06-30

Applicant: 东南大学

Inventor： 蔡体菁

IPC: G01V7/00 ,  G01C21/00 ,  G01C21/18 ,  G01V7/02 ,  G01V7/06

Abstract: 水下导航与重力测量一体化系统，包括3个激光陀螺仪（8）、3个摆式挠性加速度计（9）、3个重力传感器（2）、转位与测角装置（4）、温度传感器（7）、温度控制箱（5）、多普勒计程仪、深度计、2个计算机、数据采集处理平台、LCD显示和电路板（3,6）。3个陀螺仪（8）和3个加速度计（9）放置在转位机构（4）上，构成激光陀螺单轴旋转惯性测量单元；重力传感器（2）放在温度控制箱（5）中，与激光陀螺单轴旋转惯性测量单元刚性固联。数据采集处理平台实时处理记录各传感器信号。2个计算机分别计算水下导航与重力测量一体化系统的导航参数和当地重力值。水下导航与重力测量一体化系统，能够满足水下运载体长航时、高精度、低成本的导航和重力测量需求。

公开(公告)号：WO2020249974A1

公开(公告)日：2020-12-17

申请号：PCT/GB2020/051434

申请日：2020-06-12

Applicant: THE UNIVERSITY OF NOTTINGHAM ,  UNIVERSITY OF VIENNA

Inventor： FUENTES, Ivette ,  RÄTZEL, Dennis ,  IBARRA, Tupac Bravo ,  BRUSCHI, David Edward

IPC: G01V7/02 ,  G01P15/08

Abstract: A method of measuring an acceleration using one or more trapped BECs and at least two atomic field modes within those BECs is described. A density distribution of at least one of the one or more BECs is modified by the acceleration, which leads to a change of the field modes' time evolution. The method comprises: selecting two modes that are differently affected by the acceleration; and measuring the acceleration-induced difference; and using the measured acceleration-induced difference to infer the acceleration. Also described is a method of measuring a field gradient using one or more trapped BECs. Each of the trapped BECs has a density distribution, and at least two atomic modes within those BECs, wherein the density distributions of the one or more BECs are modified by the field, which leads to a change of the atomic modes' time evolution. The method comprises selecting two atomic modes that are differently affected by the field; and measuring a field- induced difference between the selected atomic modes; and using the measured field- induced difference to infer a gradient of the field.

公开(公告)号：WO2010016998A3

公开(公告)日：2010-04-01

申请号：PCT/US2009050408

申请日：2009-07-13

Applicant: QUARTZ SEISMIC SENSORS INC ,  PAROS JEROME ,  SCHAAD THEO P

Inventor： PAROS JEROME ,  SCHAAD THEO P

IPC: G01V1/18 ,  G01L1/10 ,  G01V7/02 ,  H01L41/08

CPC classification number: G01V1/184

Abstract: A high-resolution digital seismic and gravity sensor includes an inertial mass connected to one or more force-sensitive resonators. The weight of the inertial mass is substantially unloaded with a spring arrangement when exposed to the force of the static gravity field. Seismic accelerations applied to the base of the seismic and gravity sensor, or changes in the gravitational field, generate loads that are transmitted to force-sensitive resonators so that changes in resonant frequency are related to the applied load. The changes in resonant frequency are thus a measure of the seismic accelerations and gravitational field variations.

Abstract translation: 高分辨率数字地震和重力传感器包括连接到一个或多个力敏感谐振器的惯性质量块。 当暴露于静态重力场的力时，惯性质量的重量基本上被弹簧装置卸载。 施加于地震和重力传感器底部的地震加速度或重力场的变化会产生传递给力敏感谐振器的负载，从而使谐振频率的变化与施加的负载相关。 谐振频率的变化因此是地震加速度和引力场变化的量度。

公开(公告)号：WO2010016998A2

公开(公告)日：2010-02-11

申请号：PCT/US2009/050408

申请日：2009-07-13

Applicant: QUARTZ SEISMIC SENSORS, INC. ,  PAROS, Jerome ,  SCHAAD, Theo, P.

Inventor： PAROS, Jerome ,  SCHAAD, Theo, P.

IPC: G01V1/18 ,  G01V7/02 ,  G01L1/10 ,  H01L41/08

CPC classification number: G01V1/184

Abstract: A high-resolution digital seismic and gravity sensor includes an inertial mass connected to one or more force-sensitive resonators. The weight of the inertial mass is substantially unloaded with a spring arrangement when exposed to the force of the static gravity field. Seismic accelerations applied to the base of the seismic and gravity sensor, or changes in the gravitational field, generate loads that are transmitted to force-sensitive resonators so that changes in resonant frequency are related to the applied load. The changes in resonant frequency are thus a measure of the seismic accelerations and gravitational field variations.

Abstract translation: 高分辨率数字地震和重力传感器包括连接到一个或多个力敏感谐振器的惯性质量。 当暴露于静态重力场的力时，惯性质量块的重量基本上被弹簧装置卸载。 应用于地震和重力传感器基座的地震加速度或重力场的变化产生传递给力敏感谐振器的负载，使谐振频率的变化与施加的载荷相关。 谐振频率的变化因此是地震加速度和重力场变化的量度。

公开(公告)号：WO2021244426A1

公开(公告)日：2021-12-09

申请号：PCT/CN2021/096792

申请日：2021-05-28

Applicant: 清华大学

Inventor： 伍康 ,  文艺 ,  郭梅影

IPC: G01V7/14 ,  G01V7/02

Abstract: 一种平衡下落机构和重力仪，驱动装置可以驱动调节件在竖直方向运动。当承载件（330）和待测质量件（340）在竖直方向运动，且待测质量件（340）与承载件（330）分离使待测质量件（340）做自由落体运动时，可以通过质点系动量定理对重力仪整体进行分析，以重力仪整体质心保持不变为控制目标，得出调节件（430）在竖直方向运动的状态，进而可以通过控制调节件（430）的运动状态使得重力仪整体质心保持不变，从而消除反冲振动对测量过程的影响。