US20080302180A1 - Gravity Gradiometer - Google Patents

Gravity Gradiometer Download PDF

Info

Publication number
US20080302180A1
US20080302180A1 US11/722,050 US72205006A US2008302180A1 US 20080302180 A1 US20080302180 A1 US 20080302180A1 US 72205006 A US72205006 A US 72205006A US 2008302180 A1 US2008302180 A1 US 2008302180A1
Authority
US
United States
Prior art keywords
mount
bar
gravity gradiometer
mount section
gradiometer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/722,050
Other languages
English (en)
Inventor
Frank Joachim Van Kann
John Winterflood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technological Resources Pty Ltd
Original Assignee
Technological Resources Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2005905524A external-priority patent/AU2005905524A0/en
Application filed by Technological Resources Pty Ltd filed Critical Technological Resources Pty Ltd
Assigned to TECHNOLOGICAL RESOURCES PTY. LIMITED reassignment TECHNOLOGICAL RESOURCES PTY. LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VAN KANN, FRANK JOACHIM, WINTERFLOOD, JOHN
Publication of US20080302180A1 publication Critical patent/US20080302180A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V7/00—Measuring gravitational fields or waves; Gravimetric prospecting or detecting
    • G01V7/16—Measuring gravitational fields or waves; Gravimetric prospecting or detecting specially adapted for use on moving platforms, e.g. ship, aircraft

Definitions

  • the gradiometer includes a gimbal bearing arrangement comprised of three concentric rings in which is mounted the sensing equipment.
  • the sensing equipment generally comprises two spaced apart bars respectively located in shielded housings and each mounted on a web bearing.
  • the instrument disclosed in that application is relatively complicated in that it includes a large number of parts and is relatively heavy which is a disadvantage particularly in airborne applications.
  • the first bar is located in a first housing which is fixed to the first mount section, the bar being connected to the first housing by a fourth flexure web for movement relative to the first housing in response to the gravitational gradient.
  • actuators are provided for moving the mount about the three orthogonal axes so as to stabilise orientation of the sensor during use of the gradiometer.
  • FIG. 27 is a view similar to FIG. 25 but showing the transducer of FIG. 26 in place;
  • FIG. 32 is a view of part of the actuator of FIG. 31 ;
  • FIG. 1 is a schematic view of a gravity gradiometer according to the preferred embodiment of the invention.
  • the gradiometer shown in FIG. 1 comprises a double walled Dewar 1 which is supported in an external platform 2 .
  • the external platform 2 enables adjustment of the Dewar and therefore the contents of the Dewar about three orthogonal axes.
  • the external platform 2 is generally known and its adjustment by suitable motors or the like is also known. Thus, a detailed description will not be provided.
  • a vacuum canister 3 is provided in the Dewar and the Dewar is supplied with liquid gas such as liquid helium He so that the gradiometer can operate at cryogenic temperature.
  • the Dewar 1 is closed by an end plate 4 which includes connectors 5 a for connecting electrical leads (not shown) to external components (not shown).
  • FIGS. 3 and 4 show a second mount 20 which comprises a peripheral wall 22 and a top wall 24 .
  • the peripheral wall 22 has four lugs 13 for connecting the mount to the casing 61 .
  • the top wall 24 and the peripheral wall 22 define an opening 28 .
  • the peripheral wall 22 has a first part 25 , a second part 26 and a third part 27 .
  • the second mount 20 is a monolithic integral structure and the first part 25 is formed by making a circumferential cut 19 through the peripheral wall except for the formation of flexure webs as will be described hereinafter.
  • the third part 27 is formed by making a second circumferential cut 29 through the peripheral wall 22 except for flexure webs which will also be described hereinafter.
  • the second mount 20 is mounted on the first mount 10 by locating the hub 18 into the opening 28 and the lugs 13 through respective cut-outs 16 as is shown in FIG. 7 .
  • FIG. 8 shows sensor 40 mounted on the mounting.
  • the sensor 40 is an Orthogonal Quadrupole Responder—OQR sensor formed of a first mass and a second mass in the form of a first bar 41 and a second bar 42 (not shown in FIG. 8 ) orthogonal to the bar 41 and which is of the same shape as the bar 41 .
  • OFR Orthogonal Quadrupole Responder
  • the bar 41 and the housing 45 together with the flexure web 59 are an integral monolithic structure.
  • Transducers 71 are provided for measuring the movement of the bars and for producing output signals indicative of the amount of movement and therefore of the measurement of the differences in the gravitational field sensed by the bars.
  • FIG. 10 is a schematic block diagram showing actuator control to stabilise the gradiometer by rotating the mounting 5 about three orthogonal axes (x, y, z).
  • a controller 50 which may be a computer, microprocessor or the like outputs signals to actuators 52 , 53 , 54 and 55 .
  • the actuator 52 could rotate the mounting 5 about the x axis
  • the actuator 54 could rotate the mounting 5 about the y axis
  • the actuator 54 could rotate the mounting 5 about the z axis.
  • two of the four actuators 52 , 53 , 54 and 55 are used to rotate the mounting about each axis so that rotation about each axis is caused by a combination of two linear movements provided from two actuators.
  • each actuator will be described with reference to FIGS. 31 and 32 .
  • the position of the mounting 5 is monitored so that appropriate feedback can be provided to the controller 50 and the appropriate control signals provided to the actuators to rotate the support 10 as is required to stabilise the support during movement through the air either within or towed behind an aircraft.
  • FIG. 12 shows the mounting 5 arranged within the casing 61 and formed by the ring 62 and the transparent hemispherical ends 63 .
  • the ring 22 has connectors 69 for connecting the internal wiring from transducers 71 (see FIG. 8 ) and SQuID (Superconducting Quantum Interference Device) Electronics located in the casing 61 to the connectors 5 b ( FIG. 1 ).
  • Error correction can be performed numerically based on digitised signals from the accelerometers and a temperature sensor.
  • the first mount 10 has cut-outs 80 which effectively form slots for receiving lugs (not shown) which are connected to the mount 10 in the cut-outs 80 and also to the second mount 20 shown in FIGS. 19 to 21 .
  • the lugs are separate components so that they can be made smaller, and more easily, made than being cut with the second mount section 20 which forms the second flexure web 33 and the third flexure web 37 .
  • the cut line 88 tapers outwardly from the upper end shown in FIG. 14 to the lower end and the core 18 c tapers outwardly in corresponding shape, as best shown in FIG. 17 .
  • FIG. 21 is an exploded view of the three parts 25 , 26 and 27 which make up the second mount 20 .
  • an opening extends through the mount 20 which is formed by the hole 137 , hole 138 and hole 139 .
  • the mount 20 shown in FIG. 21 is a monolithic structure and is merely shown in exploded view to clearly illustrate the location of the flexural webs 33 and 35 .
  • the flexural web 33 shown in FIG. 21 joins with the part 26 and the flexural web 35 shown in FIG. 21 joins with the part 27 .
  • the holes 137 , 138 and 139 define a passage through which the axle or first portion 18 a of the first mount 10 can extend when the second mount 20 is located in the first mount 10 .
  • the torque produced is what constitutes the signal measured by the gradiometer.
  • the first is to use internal rotational stabilization.
  • Ho(s) represents the sensor assembly pivoted about the mounting 5 (as per FIG. 9 ).
  • the block A(s) represents the actuator, which provides the feedback torque to effect the stabilization by canceling the applied disturbances.
  • T(s) represents the sensor (or transducer) which measures the effect of the applied disturbance.
  • This is the angular accelerometer.
  • angular accelerometers in rotational control is unusual—usually gyros and/or highly damped tilt meters are used, but for our purpose the angular accelerometers are better, as the error is proportional to the angular acceleration disturbance.
  • CMRR common mode rejection
  • the transducers 71 a , 71 b , 71 g and 71 h are also used to form angular accelerometers for measuring the angular movement of the mounting 5 so that feedback signals can be provided to compensate for that angular movement.
  • the line 366 is connected to a transformer 370 .
  • the polarity of the signals from the transducers 71 a and 71 b and 71 g and 71 h are reversed so that the output of the transducer 370 on lines 371 and 372 is an addition of the signals rather than a subtraction, as is the case when the gradient is measured so the addition of the signals gives a measure of the angular movement of the bars.
  • the outputs 371 and 372 are connected to SQUID device 375 for providing a measure of the angular acceleration which can be used in the circuit of FIG. 10 to provide compensation signals to stabilise the mounting 5 .
  • Actuator 52 shown in FIG. 31 has a hollow disc housing 310 which has a mounting bracket 311 for connecting the disc housing 310 to mounting 5 .
  • the hollow disc housing 310 therefore defines an inner chamber 312 in which is located coil support plate in the form of a disc 313 .
  • the disc 313 has a wide hub section 314 and two annular surfaces 315 and 316 onto which windings W 1 and W 2 of coils are wound about the hub 314 .
  • the second winding W 2 provided on the face 316 has a lead 333 which passes through a radial hole 334 and bore 345 in the disc 313 and then through hole 337 to tube 328 and to the left in FIG. 31 .
  • the other end of the winding W 2 has a lead 338 which passes through the hole 337 into the tube 328 and to the left in FIG. 31 .
  • current can circulate through the winding W 2 via the leads 333 and 338 .
  • spurious magnetic fields which may detrimentally effect operation of the instrument are not generated by the actuator and therefore do not influence the sensitivity or operation of the instrument.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Gyroscopes (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Measuring Fluid Pressure (AREA)
  • Ink Jet (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)
  • Testing Of Balance (AREA)
US11/722,050 2005-10-06 2006-08-31 Gravity Gradiometer Abandoned US20080302180A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AU2005905524A AU2005905524A0 (en) 2005-10-06 Gravity gradiometer
AU2005905524 2005-10-06
AU2005906669A AU2005906669A0 (en) 2005-11-29 Gravity Gradiometer
AU2005906669 2005-11-29
AU2006900193 2006-01-13
AU2006900193A AU2006900193A0 (en) 2006-01-13 Gravity gradiometer
PCT/AU2006/001271 WO2007038820A1 (fr) 2005-10-06 2006-08-31 Radiometre de gravite

Publications (1)

Publication Number Publication Date
US20080302180A1 true US20080302180A1 (en) 2008-12-11

Family

ID=37905899

Family Applications (13)

Application Number Title Priority Date Filing Date
US11/722,076 Abandoned US20080257038A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,050 Abandoned US20080302180A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,061 Abandoned US20080282796A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,058 Active 2027-06-15 US7823448B2 (en) 2005-10-06 2006-08-31 Actuatory and gravity gradiometer
US11/722,077 Active US7788974B2 (en) 2005-10-06 2006-08-31 Gravity gradiometer
US11/722,073 Abandoned US20080307883A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,031 Active US7784343B2 (en) 2005-10-06 2006-08-31 Gravity gradiometer
US11/722,040 Abandoned US20080302179A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US12/643,492 Active US7938003B2 (en) 2005-10-06 2009-12-21 Gravity gradiometer
US12/646,110 Expired - Fee Related US7942054B2 (en) 2005-10-06 2009-12-23 Gravity gradiometer
US12/646,186 Active US7975544B2 (en) 2005-10-06 2009-12-23 Gravity gradiometer
US12/647,982 Active US7980130B2 (en) 2005-10-06 2009-12-28 Gravity gradiometer
US12/714,634 Active US8074515B2 (en) 2005-10-06 2010-03-01 Gravity gradiometer

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US11/722,076 Abandoned US20080257038A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer

Family Applications After (11)

Application Number Title Priority Date Filing Date
US11/722,061 Abandoned US20080282796A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,058 Active 2027-06-15 US7823448B2 (en) 2005-10-06 2006-08-31 Actuatory and gravity gradiometer
US11/722,077 Active US7788974B2 (en) 2005-10-06 2006-08-31 Gravity gradiometer
US11/722,073 Abandoned US20080307883A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US11/722,031 Active US7784343B2 (en) 2005-10-06 2006-08-31 Gravity gradiometer
US11/722,040 Abandoned US20080302179A1 (en) 2005-10-06 2006-08-31 Gravity Gradiometer
US12/643,492 Active US7938003B2 (en) 2005-10-06 2009-12-21 Gravity gradiometer
US12/646,110 Expired - Fee Related US7942054B2 (en) 2005-10-06 2009-12-23 Gravity gradiometer
US12/646,186 Active US7975544B2 (en) 2005-10-06 2009-12-23 Gravity gradiometer
US12/647,982 Active US7980130B2 (en) 2005-10-06 2009-12-28 Gravity gradiometer
US12/714,634 Active US8074515B2 (en) 2005-10-06 2010-03-01 Gravity gradiometer

Country Status (14)

Country Link
US (13) US20080257038A1 (fr)
EP (8) EP1932021B1 (fr)
JP (4) JP2009510460A (fr)
CN (9) CN101322046B (fr)
AP (4) AP2161A (fr)
AU (8) AU2006299722B2 (fr)
BR (4) BRPI0609471B1 (fr)
CA (8) CA2598635A1 (fr)
EA (4) EA012274B1 (fr)
EG (3) EG25956A (fr)
MX (4) MX2007010303A (fr)
NZ (4) NZ560702A (fr)
WO (8) WO2007038822A1 (fr)
ZA (8) ZA200707478B (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080116905A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty - Limited Gravity Gradiometer
US20080115578A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty-Limited Gravity Gradiometer
US20080115374A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty - Limited Gravity Gradiometer
US20080115377A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty -Limited Gravity Gradiometer
US20080122435A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US20080121036A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US20080121037A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US20080163682A1 (en) * 2005-10-06 2008-07-10 Technological Resources Pty. Limited Gravity Gradiometer
US20080173090A1 (en) * 2006-11-23 2008-07-24 Technological Resources Pty. Ltd. Gravity Gradiometer
US7559149B2 (en) 2006-11-22 2009-07-14 Technological Resources Pty. Ltd. Gravity gradiometer
US7562461B2 (en) 2006-11-20 2009-07-21 Technological Resources Pty. Ltd. Gravity gradiometer
US7562460B2 (en) 2006-11-23 2009-07-21 Technological Resources Pty. Ltd. Gravity gradiometer
US7571547B2 (en) 2006-11-23 2009-08-11 Technological Resources Pty. Ltd. Gravity gradiometer
US7823449B2 (en) 2006-11-23 2010-11-02 Technological Resources Pty, Ltd. Gravity gradiometer
US20110138909A1 (en) * 2008-09-25 2011-06-16 Frank Joachim Van Kann gravity gradiometer
US20110265563A1 (en) * 2008-09-25 2011-11-03 Frank Joachim Van Kann Detector for detecting a gravity gradient
US20130055808A1 (en) * 2010-03-29 2013-03-07 Frank Joachim Van Kann Gravity gradiometer with correction of external disturbance

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8375785B2 (en) * 2007-09-06 2013-02-19 Lockheed Martin Corporation Gravity gradiometer system
CN101592536B (zh) * 2008-05-30 2012-09-26 鸿富锦精密工业（深圳）有限公司 重力感测器及其应用的便携式电子设备
AU2009295358A1 (en) * 2008-09-25 2010-04-01 Technoloical Resources Pty Ltd A gravity gradiometer
WO2010045738A1 (fr) * 2008-10-24 2010-04-29 Gedex Inc. Gradiomètre de gravité doté de pivots de flexion-torsion
AU2009308266B2 (en) * 2008-10-24 2015-08-13 Martin Vol Moody Gravity gradiometer with torsion flexure pivots
DE102008043788A1 (de) * 2008-11-17 2010-05-20 Robert Bosch Gmbh Mikromechanisches Bauelement
US8359920B2 (en) * 2009-05-15 2013-01-29 Lockheed Martin Corp. Gravity sensing instrument
GB201003355D0 (en) 2010-03-01 2010-04-14 Moir Christopher I A method and apparatus for the measurement of earth's gravity and gravity gradient
US8616038B2 (en) 2010-06-02 2013-12-31 Standard Lifters, Inc. Two-piece guide pin and method
CN102608668B (zh) * 2011-12-19 2014-07-09 华中科技大学 重力梯度测量系统及其测量方法
CN102608669B (zh) * 2012-02-22 2014-01-08 北京航空航天大学 一种具有移动与转动自由度的重力梯度柔性敏感结构
US8939005B2 (en) 2012-03-15 2015-01-27 Standard Lifters, Inc. Guide pin assembly for metal forming dies and method
RU2608632C2 (ru) * 2012-05-22 2017-01-23 ЭнЭксТи ЭНЕРДЖИ СОЛЮШНЗ, ИНК. Датчик гравитации и его применение для разведки углеводородов
US9817153B2 (en) 2012-05-22 2017-11-14 Nxt Energy Solutions, Inc. Gravity transducer system and method including a junction with a first metal and a second metal
US9302311B2 (en) 2013-11-22 2016-04-05 Standard Lifters, Inc. Guide pin head
CN104133252B (zh) * 2014-07-05 2017-01-11 中国科学院电工研究所 重力梯度测量辅助定位的超导磁悬浮定位装置及定位方法
CN104459826B (zh) * 2014-11-03 2017-09-26 东南大学 旋转加速度计重力梯度仪重力梯度信号仿真方法
CN104578570B (zh) * 2015-01-05 2017-03-29 中国船舶重工集团公司第七0七研究所 一种动力学扰动旋转调制机构
CN104570142B (zh) * 2015-01-05 2017-02-22 中国船舶重工集团公司第七0七研究所 一种重力梯度仪重力梯度测量信号的解调方法
CN105005087B (zh) * 2015-07-24 2017-08-25 中国电子科技集团公司第四十九研究所 一种抗干扰的单轴重力梯度仪
US10954984B2 (en) 2016-11-30 2021-03-23 Standard Lifters, Inc. Collar and shaft assembly
CN107576992B (zh) * 2017-09-04 2019-02-22 东南大学 一种重力梯度仪自标定方法及离心梯度补偿方法
CN107907915B (zh) * 2017-12-08 2024-03-19 华中科技大学 一种三分量重力仪探头及井中重力仪系统
CN108562398A (zh) * 2018-03-30 2018-09-21 临沂大学 一种物体重心测量方法
CN109212620B (zh) * 2018-08-27 2020-01-07 东南大学 动基座旋转加速度计重力梯度仪误差补偿装置及方法
CN109212619B (zh) * 2018-08-27 2020-01-07 东南大学 一种旋转加速度计重力梯度仪线运动误差补偿装置及方法
CN109709628B (zh) * 2019-02-15 2020-08-14 东南大学 一种旋转加速度计重力梯度仪标定方法

Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398167A (en) * 1979-12-28 1983-08-09 International Business Machines Corporation Limited angle electric rotary actuator
US4399694A (en) * 1980-12-04 1983-08-23 Sperry Corporation Gravity gradiometer compass
US4809545A (en) * 1986-05-30 1989-03-07 Mobil Oil Corporation Gravimetry logging
US4828376A (en) * 1987-02-17 1989-05-09 Martin Marietta Corporation Triaxis stabilized platform
US4841772A (en) * 1987-12-03 1989-06-27 University Of Maryland, College Park Three-axis superconducting gravity gradiometer
US5339684A (en) * 1991-12-10 1994-08-23 Textron Inc. Gravity aided inertial navigation system
US5357802A (en) * 1993-05-07 1994-10-25 Textron, Incorporated Rotating accelerometer gradiometer
US5505555A (en) * 1988-12-20 1996-04-09 Rtz Mining And Exploration Ltd. Flexural pivot bearing
US5587526A (en) * 1994-03-30 1996-12-24 Oxford Instruments (Uk) Limited Proof mass support and sensing system
US5668315A (en) * 1988-12-20 1997-09-16 The University Of Western Australia Gravity gradiometer with flexural pivot bearing
US5728935A (en) * 1996-08-14 1998-03-17 Czompo; Jozsef Method and apparatus for measuring gravity with lever arm correction
US5922951A (en) * 1997-06-11 1999-07-13 The Broken Hill Proprietary Company Ltd. Gravity gradiometer
US5922591A (en) * 1995-06-29 1999-07-13 Affymetrix, Inc. Integrated nucleic acid diagnostic device
US5962781A (en) * 1994-10-04 1999-10-05 Gravitec Instruments Limited Apparatus for the measurement of gravitational fields
US6082194A (en) * 1996-04-26 2000-07-04 The Commonwealth Of Australia Commonwealth Scientific And Industrial Research Organization Gravity meter
US6450028B1 (en) * 1997-09-06 2002-09-17 Vail, Iii William Banning Precision gravity gradiometer optically measuring density variations in gases
US6494091B2 (en) * 2001-02-28 2002-12-17 Gilles Couture Apparatus for measuring a gravitational attraction of the earth
US20030033086A1 (en) * 2001-06-18 2003-02-13 Lee James Beresford Gravity surveys
US6526825B2 (en) * 2001-02-28 2003-03-04 Neozoic Geophysical Survey, Ltd. Gravity device
US6612171B1 (en) * 1999-08-03 2003-09-02 Schlumberger Technology Corporation Gravity measuring apparatus
US20030209070A1 (en) * 2002-03-06 2003-11-13 Lockheed Martin Corporation Gravity gradiometer and method for calculating a gravity tensor with increased accuracy
US6658935B1 (en) * 2001-03-07 2003-12-09 Lockheed Martin Corporation Complemented absolute/relative full-tensor gravity gradiometer system
US6668646B1 (en) * 2001-06-21 2003-12-30 The Open University Gravity meter
US20040211255A1 (en) * 2001-06-15 2004-10-28 Leeuwen Edwin Hans Van Airborne gravity gradiometers
US6837106B2 (en) * 2000-11-28 2005-01-04 Business Arts Inc. Gravity gradiometry
US6882937B2 (en) * 2003-02-18 2005-04-19 Pathfinder Energy Services, Inc. Downhole referencing techniques in borehole surveying
US20050116717A1 (en) * 2002-02-12 2005-06-02 Mark Dransfield Airborne vector magnetic surveys
US20050160815A1 (en) * 2002-03-18 2005-07-28 Lee James B. Enhancement of sensors for airborne operation
US6954698B2 (en) * 2002-06-28 2005-10-11 Gedex Inc. System and method for surveying underground density distributions
US20050236909A1 (en) * 1999-11-19 2005-10-27 Baker Robert M Jr Gravitational wave imaging
US20060117848A1 (en) * 2004-12-07 2006-06-08 Felix Raffalt Method and apparatus for material identification by means of gravitational field analysis
US20060156810A1 (en) * 2005-01-04 2006-07-20 Bell Geospace Inc. Accelerometer and rate sensor package for gravity gradiometer instruments
US20060207326A1 (en) * 2005-03-18 2006-09-21 Moody Martin V Cross-component superconducting gravity gradiometer with improved linearity and sensitivity and method for gravity gradient sensing

Family Cites Families (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012191A (en) * 1945-11-15 1961-12-05 Charles E Miller Gradiometer
US2743415A (en) * 1946-09-30 1956-04-24 Kenneth G Williams Gradiometer
US2809524A (en) 1954-01-11 1957-10-15 Exxon Research Engineering Co Automatic damping of a gravimeter
US3273397A (en) 1964-06-05 1966-09-20 Hughes Aircraft Co Measurement of static force field gradients
US3564921A (en) * 1968-02-02 1971-02-23 Hughes Aircraft Co Torsionally resonant gravity gradient sensor
US3722288A (en) * 1969-01-31 1973-03-27 Hughes Aircraft Co Electromagnetic coupled detector of dynamic gravitational force gradients
US3758854A (en) * 1971-03-12 1973-09-11 Ja Zimmerman Superconductive quantum interference device having two cavities isolated by a superconductive weak link
GB1385189A (en) 1971-11-05 1975-02-26 Russell M K Remote angle measurement
US3956690A (en) 1974-01-21 1976-05-11 Develco, Inc. Trimmed superconductive magnetic pickup coil circuits
US3926054A (en) 1974-11-11 1975-12-16 Draper Lab Charles S Gravity gradiometer
US4024468A (en) 1975-06-18 1977-05-17 White's Electronics, Inc. Induction balance metal detector with inverse discrimination
DE3209590A1 (de) * 1982-03-17 1983-09-29 Bodenseewerk Geosystem GmbH, 7770 Überlingen Gravimeter
US4513618A (en) * 1982-04-02 1985-04-30 Standard Oil Company (Indiana) Gravity gradiometer and method
US4803413A (en) * 1986-07-15 1989-02-07 Honeywell Inc. Magnetic isolating and pointing gimbal apparatus
US4713890A (en) 1987-01-12 1987-12-22 Cubic Corporation Mislevel sensing device
US4935883A (en) * 1988-05-17 1990-06-19 Sundstrand Data Control, Inc. Apparatus and method for leveling a gravity measurement device
WO1990007131A1 (fr) 1988-12-20 1990-06-28 Rtz Mining And Exploration Ltd. Instrument a mesurer les gradients par gravite
US5130654A (en) 1989-06-16 1992-07-14 University Of Virginia Alumni Patents Foundation Magnetolelastic amorphous metal ribbon gradiometer
FI95628C (fi) 1990-05-15 1996-02-26 Valtion Teknillinen Menetelmä ja laite pienikohinaisen anturin lähtösignaalin käsittelemiseksi
US5224380A (en) 1990-05-21 1993-07-06 The University Of Maryland Superconducting six-axis accelerometer
US5326986A (en) * 1991-03-05 1994-07-05 University Of Houston - University Park Parallel N-junction superconducting interferometer with enhanced flux-to-voltage transfer function
US5293119A (en) 1992-02-20 1994-03-08 Sqm Technology, Inc. Electromagnetic microscope for evaluation of electrically conductive and magnetic materials
RU2046380C1 (ru) 1992-04-22 1995-10-20 Пермский политехнический институт Гравитационный трехкомпонентный градиентометр
US5424592A (en) * 1993-07-01 1995-06-13 Aura Systems, Inc. Electromagnetic transducer
RU2056642C1 (ru) 1993-07-09 1996-03-20 Центральный научно-исследовательский институт "Дельфин" Гравиметр для измерения силы тяжести с движущихся носителей
EP0634663B1 (fr) 1993-07-12 2000-02-16 Sumitomo Electric Industries, Limited Dispositif de test non-destructif avec capteur magnétique de type SQUID
RU2127439C1 (ru) 1997-10-21 1999-03-10 Центральный научно-исследовательский институт "Дельфин" Гравиметр
DE19751724A1 (de) 1997-11-21 1999-07-15 Holger Dipl Ing Schuette Gerät zur Gravitationsmessung
WO2000031550A1 (fr) 1998-11-25 2000-06-02 University Of Maryland Support de masse d'epreuve pour accelerometres
RU2156481C1 (ru) 1999-09-14 2000-09-20 Научный центр гравитационно-волновых исследований "Дулкын" Академии наук Республики Татарстан Гравитационно-волновой детектор
CN1118713C (zh) 1999-10-28 2003-08-20 中国地震局地震研究所 一种高精度重力仪
RU2167437C1 (ru) 1999-11-30 2001-05-20 Научный центр гравитационно-волновых исследований "Дулкын" АН Республики Татарстан Гравитационно-волновой детектор
RU2171481C1 (ru) 2000-02-03 2001-07-27 Бронштейн Игорь Григорьевич Кварцевый гравиметр
RU2171482C1 (ru) 2000-02-04 2001-07-27 Научный центр гравитационно-волновых исследований "Дулкын" АН Республики Татарстан Гравитационно-волновой детектор
RU2175773C1 (ru) 2000-04-24 2001-11-10 Центральный научно-исследовательский институт "Электроприбор" Гравитационный вариометр
RU2172967C1 (ru) 2000-06-05 2001-08-27 Центральный научно-исследовательский институт "Электроприбор" Гравитационный вариометр
RU2171483C1 (ru) 2000-07-17 2001-07-27 Научный центр гравитационно-волновых исследований "Дулкын" АН Республики Татарстан Гравитационно-волновой детектор
JP2002040153A (ja) 2000-07-25 2002-02-06 Fuji Photo Film Co Ltd ケース収容物の有無検出装置
JP4316777B2 (ja) 2000-07-26 2009-08-19 東京計器株式会社 重力測定装置及び方法
US7821953B2 (en) * 2005-05-13 2010-10-26 Yahoo! Inc. Dynamically selecting CODECS for managing an audio message
NZ534963A (en) 2002-02-06 2006-02-24 Univ California SQUID Detected NMR and MRI at ultralow fields
US6724188B2 (en) 2002-03-29 2004-04-20 Wavbank, Inc. Apparatus and method for measuring molecular electromagnetic signals with a squid device and stochastic resonance to measure low-threshold signals
RU2221263C1 (ru) 2002-07-01 2004-01-10 Общество с ограниченной ответственностью Научно-производственное объединение "Петрогаз" Способ и устройство для измерения гравитационного поля
RU2242032C1 (ru) 2003-07-31 2004-12-10 Открытое акционерное общество "Раменское приборостроительное конструкторское бюро" Гравиметр
RU2253882C1 (ru) 2003-11-28 2005-06-10 Открытое акционерное общество "Нефтяные контрольно-измерительные приборы" ("Нефтекип") Гравиметр
RU2253138C1 (ru) 2003-11-28 2005-05-27 Открытое акционерное общество "Нефтяные контрольно-измерительные приборы" ("Нефтекип") Гравиметр
RU2290674C2 (ru) 2004-04-29 2006-12-27 Джамалудин Гаджиевич Таймазов Гравитационный вариометр
US7401514B2 (en) 2005-06-08 2008-07-22 Friedrich-Alexander-Universitat At Erlangen-Nurnberg Asymmetric torsion balance gravimeter
ZA200801887B (en) 2005-07-29 2009-09-30 Steven J Thorpe Gravity gradiometer
ZA200707478B (en) 2005-10-06 2008-11-26 Tech Resources Pty Ltd Gravity gradiometer
US7863892B2 (en) 2005-10-07 2011-01-04 Florida State University Research Foundation Multiple SQUID magnetometer
CA2690958C (fr) 2006-11-20 2015-06-30 Technological Resources Pty Limited Gradiometre de gravite
WO2008061272A1 (fr) 2006-11-20 2008-05-29 Technological Resources Pty Limited Gradiomètre de gravité
CA2690933A1 (fr) 2006-11-20 2008-05-29 Technological Resources Pty Limited Gradiometre de gravite
WO2008061273A1 (fr) 2006-11-20 2008-05-29 Technological Resources Pty Limited Gradiomètre de gravité
CA2690893A1 (fr) 2006-11-20 2008-05-29 Technological Resources Pty Limited Gradiometre de gravite
WO2008061277A1 (fr) 2006-11-20 2008-05-29 Technological Resources Pty Limited Gradiomètre de gravité
CA2612677A1 (fr) * 2006-11-23 2008-05-23 Technological Resources Pty. Limited Compensation des accelerations non desirees d'un gradiometre a gravite
ZA200710805B (en) 2006-11-23 2009-03-25 Tech Resources Pty Ltd Gravity gradiometer
CA2612568C (fr) 2006-11-23 2015-05-19 Technological Resources Pty. Limited Gradiometre a gravite
CA2612602A1 (fr) * 2006-11-23 2008-05-23 Technological Resources Pty, Limited. Gradiometre a gravite
EP1949142B1 (fr) 2006-11-23 2015-05-13 Technological Resources PTY. Limited Gradiomètre gravifique
CA2612902C (fr) 2006-11-23 2015-05-19 Technological Resources Pty Limited Gradiometre a gravite

Patent Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4398167A (en) * 1979-12-28 1983-08-09 International Business Machines Corporation Limited angle electric rotary actuator
US4399694A (en) * 1980-12-04 1983-08-23 Sperry Corporation Gravity gradiometer compass
US4809545A (en) * 1986-05-30 1989-03-07 Mobil Oil Corporation Gravimetry logging
US4828376A (en) * 1987-02-17 1989-05-09 Martin Marietta Corporation Triaxis stabilized platform
US4841772A (en) * 1987-12-03 1989-06-27 University Of Maryland, College Park Three-axis superconducting gravity gradiometer
US5505555A (en) * 1988-12-20 1996-04-09 Rtz Mining And Exploration Ltd. Flexural pivot bearing
US5668315A (en) * 1988-12-20 1997-09-16 The University Of Western Australia Gravity gradiometer with flexural pivot bearing
US5804722A (en) * 1988-12-20 1998-09-08 Rtz Mining & Exploration Ltd. Gravity gradiometer
US5339684A (en) * 1991-12-10 1994-08-23 Textron Inc. Gravity aided inertial navigation system
US5357802A (en) * 1993-05-07 1994-10-25 Textron, Incorporated Rotating accelerometer gradiometer
US5817939A (en) * 1994-03-30 1998-10-06 Oxford Instruments (Uk) Limited Proof mass support and sensing system
US5587526A (en) * 1994-03-30 1996-12-24 Oxford Instruments (Uk) Limited Proof mass support and sensing system
US5962781A (en) * 1994-10-04 1999-10-05 Gravitec Instruments Limited Apparatus for the measurement of gravitational fields
US5922591A (en) * 1995-06-29 1999-07-13 Affymetrix, Inc. Integrated nucleic acid diagnostic device
US6082194A (en) * 1996-04-26 2000-07-04 The Commonwealth Of Australia Commonwealth Scientific And Industrial Research Organization Gravity meter
US5728935A (en) * 1996-08-14 1998-03-17 Czompo; Jozsef Method and apparatus for measuring gravity with lever arm correction
US5922951A (en) * 1997-06-11 1999-07-13 The Broken Hill Proprietary Company Ltd. Gravity gradiometer
US6450028B1 (en) * 1997-09-06 2002-09-17 Vail, Iii William Banning Precision gravity gradiometer optically measuring density variations in gases
US6612171B1 (en) * 1999-08-03 2003-09-02 Schlumberger Technology Corporation Gravity measuring apparatus
US20050236909A1 (en) * 1999-11-19 2005-10-27 Baker Robert M Jr Gravitational wave imaging
US6837106B2 (en) * 2000-11-28 2005-01-04 Business Arts Inc. Gravity gradiometry
US6494091B2 (en) * 2001-02-28 2002-12-17 Gilles Couture Apparatus for measuring a gravitational attraction of the earth
US6526825B2 (en) * 2001-02-28 2003-03-04 Neozoic Geophysical Survey, Ltd. Gravity device
US6658935B1 (en) * 2001-03-07 2003-12-09 Lockheed Martin Corporation Complemented absolute/relative full-tensor gravity gradiometer system
US20040211255A1 (en) * 2001-06-15 2004-10-28 Leeuwen Edwin Hans Van Airborne gravity gradiometers
US20030033086A1 (en) * 2001-06-18 2003-02-13 Lee James Beresford Gravity surveys
US6668646B1 (en) * 2001-06-21 2003-12-30 The Open University Gravity meter
US20050116717A1 (en) * 2002-02-12 2005-06-02 Mark Dransfield Airborne vector magnetic surveys
US6799459B2 (en) * 2002-03-06 2004-10-05 Lockheed Martin Corporation Gravity gradiometer and method for calculating a gravity tensor with increased accuracy
US20030209070A1 (en) * 2002-03-06 2003-11-13 Lockheed Martin Corporation Gravity gradiometer and method for calculating a gravity tensor with increased accuracy
US20050160815A1 (en) * 2002-03-18 2005-07-28 Lee James B. Enhancement of sensors for airborne operation
US6954698B2 (en) * 2002-06-28 2005-10-11 Gedex Inc. System and method for surveying underground density distributions
US6882937B2 (en) * 2003-02-18 2005-04-19 Pathfinder Energy Services, Inc. Downhole referencing techniques in borehole surveying
US20060117848A1 (en) * 2004-12-07 2006-06-08 Felix Raffalt Method and apparatus for material identification by means of gravitational field analysis
US20060156810A1 (en) * 2005-01-04 2006-07-20 Bell Geospace Inc. Accelerometer and rate sensor package for gravity gradiometer instruments
US20060207326A1 (en) * 2005-03-18 2006-09-21 Moody Martin V Cross-component superconducting gravity gradiometer with improved linearity and sensitivity and method for gravity gradient sensing

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7938003B2 (en) * 2005-10-06 2011-05-10 Technological Resources Pty. Limited Gravity gradiometer
US20100107756A1 (en) * 2005-10-06 2010-05-06 Technological Resources Pty, Ltd. Gravity Gradiometer
US8074515B2 (en) * 2005-10-06 2011-12-13 Technological Resources Pty. Ltd. Gravity gradiometer
US7980130B2 (en) * 2005-10-06 2011-07-19 Technological Resources Pty. Ltd. Gravity gradiometer
US7975544B2 (en) * 2005-10-06 2011-07-12 Technological Resources Pty. Ltd. Gravity gradiometer
US7942054B2 (en) * 2005-10-06 2011-05-17 Technological Resources Pty. Ltd. Gravity gradiometer
US7823448B2 (en) * 2005-10-06 2010-11-02 Technological Resources Pty. Ltd. Actuatory and gravity gradiometer
US20080163682A1 (en) * 2005-10-06 2008-07-10 Technological Resources Pty. Limited Gravity Gradiometer
US7788974B2 (en) 2005-10-06 2010-09-07 Technological Resources Pty. Ltd. Gravity gradiometer
US20080236277A1 (en) * 2005-10-06 2008-10-02 Technological Resources Pty. Limited Gravity Gradiometer
US7784343B2 (en) 2005-10-06 2010-08-31 Technological Resources Pty. Ltd. Gravity gradiometer
US20100154537A1 (en) * 2005-10-06 2010-06-24 Technological Resources Pty. Ltd. Gravity Gradiometer
US20100095765A1 (en) * 2005-10-06 2010-04-22 Technological Resources Pty. Ltd. Gravity Gradiometer
US20100154536A1 (en) * 2005-10-06 2010-06-24 Technological Resources Pty. Limited Gravity gradiometer
US20080115377A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty -Limited Gravity Gradiometer
US20080115578A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty-Limited Gravity Gradiometer
US7596876B2 (en) 2006-11-20 2009-10-06 Technological Resources Pty. Ltd. Gravity gradiometer
US20080115374A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty - Limited Gravity Gradiometer
US8033170B2 (en) * 2006-11-20 2011-10-11 Technological Resources Pty. Ltd. Gravity gradiometer
US20100071462A1 (en) * 2006-11-20 2010-03-25 Technological Resources Pty. Ltd. Gravity Gradiometer
US20100005882A1 (en) * 2006-11-20 2010-01-14 Technological Resources Pty. Ltd. Gravity Gradiometer
US7814790B2 (en) * 2006-11-20 2010-10-19 Technological Resources Pty. Ltd. Gravity gradiometer
US7584544B2 (en) 2006-11-20 2009-09-08 Technological Resources Pty, Ltd. Gravity gradiometer
US7581327B2 (en) 2006-11-20 2009-09-01 Technological Recources Pty. Ltd. Gravity gradiometer
US7714584B2 (en) 2006-11-20 2010-05-11 Technological Resources Pty. Ltd. Gravity gradiometer
US20080116905A1 (en) * 2006-11-20 2008-05-22 Technological Resources Pty - Limited Gravity Gradiometer
US7562461B2 (en) 2006-11-20 2009-07-21 Technological Resources Pty. Ltd. Gravity gradiometer
US7559149B2 (en) 2006-11-22 2009-07-14 Technological Resources Pty. Ltd. Gravity gradiometer
US7562460B2 (en) 2006-11-23 2009-07-21 Technological Resources Pty. Ltd. Gravity gradiometer
US7627954B2 (en) 2006-11-23 2009-12-08 Technological Resources Pty. Ltd. Gravity gradiometer
US20080121037A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US7823449B2 (en) 2006-11-23 2010-11-02 Technological Resources Pty, Ltd. Gravity gradiometer
US7849739B2 (en) * 2006-11-23 2010-12-14 Technological Resources Pty. Ltd. Gravity gradiometer
US7571547B2 (en) 2006-11-23 2009-08-11 Technological Resources Pty. Ltd. Gravity gradiometer
US20080121036A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US7624635B2 (en) 2006-11-23 2009-12-01 Technological Resources Pty. Ltd. Gravity gradiometer
US20080122435A1 (en) * 2006-11-23 2008-05-29 Technological Resources Pty. Ltd. Gravity Gradiometer
US7637153B2 (en) 2006-11-23 2009-12-29 Technological Resources Pty. Ltd. Gravity gradiometer
US20080173090A1 (en) * 2006-11-23 2008-07-24 Technological Resources Pty. Ltd. Gravity Gradiometer
US20110265563A1 (en) * 2008-09-25 2011-11-03 Frank Joachim Van Kann Detector for detecting a gravity gradient
US20110138909A1 (en) * 2008-09-25 2011-06-16 Frank Joachim Van Kann gravity gradiometer
US8650950B2 (en) * 2008-09-25 2014-02-18 Technological Resources Pty, Ltd. Detector for detecting a gravity gradient
US8789415B2 (en) * 2008-09-25 2014-07-29 Technological Resources Pty. Ltd. Gravity gradiometer
US20130055808A1 (en) * 2010-03-29 2013-03-07 Frank Joachim Van Kann Gravity gradiometer with correction of external disturbance

Also Published As

Publication number Publication date
CA2598626A1 (fr) 2007-04-12
EP1932027B1 (fr) 2015-03-18
AU2006299722A1 (en) 2007-04-12
EP1932027A1 (fr) 2008-06-18
ZA200707481B (en) 2009-09-30
US20080307883A1 (en) 2008-12-18
CA2598599A1 (fr) 2007-04-12
EA011644B1 (ru) 2009-04-28
EP1932028A4 (fr) 2011-12-14
NZ560700A (en) 2011-02-25
CA2598625A1 (fr) 2007-04-12
US20100095765A1 (en) 2010-04-22
CN101156088B (zh) 2011-09-07
MX2007010302A (es) 2008-03-13
BRPI0609473A2 (pt) 2010-04-13
AU2006299725B2 (en) 2011-03-24
JP2009510461A (ja) 2009-03-12
US20100154537A1 (en) 2010-06-24
MX2007010300A (es) 2008-02-12
CN101322047B (zh) 2012-09-19
WO2007038825A1 (fr) 2007-04-12
CN101322048B (zh) 2011-09-07
BRPI0609474A2 (pt) 2010-04-13
WO2007038820A1 (fr) 2007-04-12
AU2006299725A1 (en) 2007-04-12
AP2007004130A0 (en) 2007-08-31
AU2006299727B2 (en) 2011-07-21
AU2006299728A1 (en) 2007-04-12
AP2007004131A0 (en) 2007-08-31
WO2007038822A1 (fr) 2007-04-12
CN101156086A (zh) 2008-04-02
AU2006299726B2 (en) 2011-06-02
CA2598628C (fr) 2013-10-15
ZA200707478B (en) 2008-11-26
AU2006299723A1 (en) 2007-04-12
CN101218518A (zh) 2008-07-09
WO2007038823A1 (fr) 2007-04-12
AP2238A (en) 2011-05-26
CN101156087A (zh) 2008-04-02
MX2007010301A (es) 2008-03-04
AU2006299728B2 (en) 2011-07-28
CN101218518B (zh) 2011-09-21
CA2598625C (fr) 2013-11-19
US20080257038A1 (en) 2008-10-23
US20080282796A1 (en) 2008-11-20
AU2006299727A1 (en) 2007-04-12
US20080236277A1 (en) 2008-10-02
CA2598597A1 (fr) 2007-04-12
EP1932022A1 (fr) 2008-06-18
EP1932024A1 (fr) 2008-06-18
US20100154536A1 (en) 2010-06-24
BRPI0609472B1 (pt) 2018-05-22
CA2598623A1 (fr) 2007-04-12
EP1932025A1 (fr) 2008-06-18
EA200701550A1 (ru) 2008-02-28
CN101322047A (zh) 2008-12-10
JP2009510458A (ja) 2009-03-12
US7823448B2 (en) 2010-11-02
US7975544B2 (en) 2011-07-12
EP1932021A1 (fr) 2008-06-18
WO2007038818A1 (fr) 2007-04-12
US20080163682A1 (en) 2008-07-10
US8074515B2 (en) 2011-12-13
CA2598599C (fr) 2013-08-27
AU2006299724B2 (en) 2011-04-07
EP1932024B1 (fr) 2013-01-02
CN101322046B (zh) 2012-07-04
AU2006299722B2 (en) 2011-07-21
EP1932023A1 (fr) 2008-06-18
EP1932028A1 (fr) 2008-06-18
BRPI0609471A2 (pt) 2010-04-13
EG25956A (en) 2012-11-13
EA012913B1 (ru) 2010-02-26
EP1932026A4 (fr) 2011-11-16
US20100095766A1 (en) 2010-04-22
EP1932027A4 (fr) 2011-11-16
ZA200707515B (en) 2008-11-26
CN101322049B (zh) 2012-01-11
US7938003B2 (en) 2011-05-10
EP1932021B1 (fr) 2015-10-07
US20100107756A1 (en) 2010-05-06
BRPI0609471B1 (pt) 2018-04-24
EA200701549A1 (ru) 2008-02-28
EP1932023A4 (fr) 2011-11-09
CN101322048A (zh) 2008-12-10
NZ560701A (en) 2011-02-25
ZA200707477B (en) 2008-11-26
EP1932022A4 (fr) 2011-11-16
CA2598597C (fr) 2013-10-15
MX2007010303A (es) 2008-03-11
ZA200707476B (en) 2008-11-26
AP2183A (en) 2010-11-30
ZA200707475B (en) 2008-11-26
AU2006299726A1 (en) 2007-04-12
US7980130B2 (en) 2011-07-19
AU2006299723B2 (en) 2011-07-21
AP2161A (en) 2010-11-01
CA2598628A1 (fr) 2007-04-12
BRPI0609472A2 (pt) 2010-04-13
EA200701548A1 (ru) 2008-02-28
CN101156086B (zh) 2012-10-31
US7942054B2 (en) 2011-05-17
NZ560702A (en) 2011-02-25
US20080302179A1 (en) 2008-12-11
EA200701551A1 (ru) 2008-02-28
CN101322046A (zh) 2008-12-10
CN101156088A (zh) 2008-04-02
JP2009510459A (ja) 2009-03-12
US7784343B2 (en) 2010-08-31
US7788974B2 (en) 2010-09-07
CA2598467A1 (fr) 2007-04-12
WO2007038819A1 (fr) 2007-04-12
EP1932024A4 (fr) 2011-11-09
CA2598635A1 (fr) 2007-04-12
EP1932026A1 (fr) 2008-06-18
EP1932025A4 (fr) 2011-11-16
US20090260433A1 (en) 2009-10-22
ZA200707479B (en) 2008-11-26
EG25958A (en) 2012-11-13
NZ560699A (en) 2011-02-25
JP2009510460A (ja) 2009-03-12
CA2598626C (fr) 2013-10-15
AP2456A (en) 2012-09-01
AU2006299724A1 (en) 2007-04-12
CN101322049A (zh) 2008-12-10
EA012274B1 (ru) 2009-08-28
AU2006299729A1 (en) 2007-04-12
CN102353997B (zh) 2015-09-16
AU2006299729B2 (en) 2011-07-28
EP1932025B1 (fr) 2013-04-10
WO2007038821A1 (fr) 2007-04-12
CN102353997A (zh) 2012-02-15
EP1932021A4 (fr) 2011-11-16
WO2007038824A1 (fr) 2007-04-12
EA012192B1 (ru) 2009-08-28
EG25957A (en) 2012-11-13
ZA200707480B (en) 2008-11-26

Similar Documents

Publication Publication Date Title
US7942054B2 (en) Gravity gradiometer

Legal Events

Date Code Title Description
AS Assignment

Owner name: TECHNOLOGICAL RESOURCES PTY. LIMITED, AUSTRALIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VAN KANN, FRANK JOACHIM;WINTERFLOOD, JOHN;REEL/FRAME:019847/0518

Effective date: 20070713

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION