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7637153 |
Gravity gradiometer
A gravity gradiometer is disclosed which comprises a pair of sensor masses arranged in housings. Transducers are provided for measuring movement of the sensor masses in response to the gravity...
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7624635 |
Gravity gradiometer
A heat switch 570 is disclosed as well as a gradiometer having the heat switch. The heat switch is formed from a non-magnetic material such as a semi-conducting material. The semi-conducting...
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7469585 |
Miniature freefall mechanism
A system for measuring differential gravity at two points is disclosed. In the illustrative embodiment, the system uses a pair of graspers which each repeatedly grasp, raise, and drop a test mass....
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7451645 |
Test mass for gravimeters and gradiometers
The present invention provides devices and methods for reducing or eliminating sources of systematic errors in the measurement of absolute gravity or gravity field gradients; specifically, an...
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7365544 |
Methods of adjusting airborne geophysical measurements based on mapping instrument measurements
This invention concerns a method of making airborne geophysical measurements. Such measurements may be made from fixed or moving wing airplanes or dirigibles. The method comprises the following...
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7360419 |
Gravity gradiometer
A gravity gradiometer having quadrupole responders in which a mass quadrupole is supported by a torsional spring forming a flexure allowing rotation of the mass quadrupole about its center of mass....
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7305879 |
Cross-component superconducting gravity gradiometer with improved linearity and sensitivity and method for gravity gradient sensing
A cross-component superconducting gravity gradiometer sensitive to off-diagonal components of the gradient tensor includes, for each gradient axis, a pair of closely matched angular accelerometers...
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7181967 |
Enhancement of sensors for airborne operation
Gravity gradiometers (or gravity gradient instrument, GGI) measure one or more components of the gradient of gravity which is expressed as the gradient of a gravity vector. One or more feedback...
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6954698 |
System and method for surveying underground density distributions
A method for geographical surveying includes the steps of determining an observation grid comprising observation points above a solution volume in the ground; making gravitational measurements at...
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6883372 |
Airborne gravity gradiometers
This invention concerns gravity gradiometers for airborne surveys for minerals. The gravity gradiometer comprises an inertially stabilized platform, a rotor that is between 0.4 and 1.5 m in...
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6871542 |
Apparatus for the measurement of gravitational gradients
An apparatus for the measurement of quasi-static gravity gradients comprising a flexible string and output means for producing an output which is a function of the gravity gradients, wherein the...
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6837106 |
Gravity gradiometry
A gravity gradiometer is combined with a two-stage actively controlled isolation system. The gravity gradiometer and two stage isolation system may then be mounted within (or on) a mobile vehicle...
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6813564 |
Method for monitoring seafloor subsidence and for gravity monitoring an underground hydrocarbon reservoir
The invention is a method for monitoring subsidence of the sea-bed ( 14 ) of a survey area ( 8 ) caused by compaction of an underground hydrocarbon reservoir ( 1 ), and comprises the following...
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6799459 |
Gravity gradiometer and method for calculating a gravity tensor with increased accuracy
A method includes measuring an acceleration along an input axis of an accelerometer mounted to a gradiometer disc, the accelerometer having a coordinate axis that is parallel to a spin axis of the...
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6776035 |
Method and device for calibration of dual-axis tilt meter
The invention is directed toward a subsurface gravity measurement device and a method for calibrating the same that includes a tilt meter and a gravity sensor. The method includes associating tilt...
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6778918 |
Methods for monitoring fluid front movements in hydrocarbon reservoirs using permanent sensors
A method of monitoring a fluid front movement is provided. The method includes: determining at least two techniques for monitoring the fluid front movement; determining a configuration of...
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6668646 |
Gravity meter
A gravity meter comprises a casing, a vacuum tube mounted in the casing in a vibration-free manner, a sensor mechanism mounted within the vacuum tube, the sensor mechanism comprising two masses of...
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6658935 |
Complemented absolute/relative full-tensor gravity gradiometer system
A complemented absolute/relative full-tensor gravity gradiometer system utilizes an absolute gravity instrument and a relative gravity gradiometer to provide respective outputs corresponding to...
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6612171 |
Gravity measuring apparatus
A gravity measuring apparatus is provided comprising a gravitational force detector including a test mass and which produces measurements related to gravitational force exerted on the test mass,...
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6526825 |
Gravity device
A gravity measuring instrument comprises a housing, a float, and proximity sensing means between the housing and the float. The housing defines a vertically oriented elongated chamber for...
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6450028 |
Precision gravity gradiometer optically measuring density variations in gases
Precision gravity gradiometers and precision differential gravimeters are described. The instruments possess a gaseous medium comprised of molecules that scatter light from typically a laser light...
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6300614 |
Communication system using gravitational waves
A method and apparatus for communication using gravitational waves is disclosed. The system utilizes a resonant frequency set up between identical masses to transmit information. The communication...
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6212952 |
System and process for optimizing gravity gradiometer measurements
Gravity gradient measurements taken by an accelerometer type gradiometer are optimized by tilting the measuring plane of the instrument by a selected angle above and below the horizontal to obtain...
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6185502 |
Passive position fix system
A passive position fix system for a vehicle in which a gyro first provides a first gyro position of the vehicle, a map storage means which receives the first gyro position and in response thereto...
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6082194 |
Gravity meter
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6028270 |
Noninvasive mass determination stockpiled materials
The mass of stockpiled materials is determined from detailed measurements of the elevation of the pile surface at many points and the measurement of the gravitational field along several profile...
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5962781 |
Apparatus for the measurement of gravitational fields
Apparatus for measuring gravitational fields comprising a superconducting string (1) fixed at both ends and forming part of a closed superconducting loop inductively coupled to two driving...
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5922951 |
Gravity gradiometer
This 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...
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5821413 |
Gravity gradiometry in a wellbore using a virtual long-baseline
A method of obtaining gravity gradient well logs over selected baselines, using a well log tool having first and second gravity meters separated by a fixed distance, referred to as the baseline, is...
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5817939 |
Proof mass support and sensing system
A proof mass support system has a pair of alignment coils for controlling the rest position of an elongate proof mass. The alignment coils are constructed to provide a levitation force when they...
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5734104 |
Laplace gravity gradiometer
A gravity gradiometer capable of obtaining the vertical component T zz of the gravity gradient tensor out of the two horizontal components T xx and T yy based on Laplace equation: T zz =-(T xx ...
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5728935 |
Method and apparatus for measuring gravity with lever arm correction
The gravimetry apparatus includes two rigidly connected accelerometer triads and a global positioning system antenna defining a kinematic reference point. The apparatus has a specific layout where...
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5703567 |
Toilet seat alarm
A toilet seat alarm comprising a housing unit having pegs for insertion into a toilet seat, resembling a standard bumper placed on the underside of a toilet seat. A timing device-alarm, power...
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5673191 |
Method and apparatus for identifying geological structures using wavelet analysis of potential fields
A method of analyzing geological survey data of the potential field measurement type is disclosed. According to the disclosed method, discrete measurement values of the potential field, either the...
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5668315 |
Gravity gradiometer with flexural pivot bearing
A gravity gradiometer for measuring off-diagonal components of the gravitational gradient tensor includes a housing having a pair of electromagnetic shield enclosures (22, 23) arranged one inside...
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5637797 |
Optical fiber gravity meter
A gravity meter has a portable housing for holding a corner cube retroreflector that can be dropped within the housing. The housing also holds a laser and an optical fiber having a first end in...
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5448912 |
Borehole gravity density measuring system
An apparatus and method for conducting a precise gravimetry survey downhole in an earth formation. The apparatus includes an elongated closed, hollow, cylindrical pressure vessel. The vessel is...
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5440928 |
Nulling and measuring system
A gravity meter includes a support framework which supports a suspension system having a weight beam to which a reaction mass is attached. The reaction mass includes a dielectric mass which extends...
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5402340 |
Gradiometer based terrain estimation
A terrain estimation system and procedure in which prior knowledge of terrain configuration is taken as a starting point in the estimation procedure. The gravity field of the earth is sensed by a...
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5357802 |
Rotating accelerometer gradiometer
A gravity gradiometer and method for measurement of changes in the intensity of a gravitational field experienced during traversal over earth's terrain, or past a massive object, has a set of eight...
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5341681 |
Stepped gravity gradiometer
A gravity gradiometer instrument alternately and sequentially rotatable in opposing angular increments provides a measure of the gravity gradient in-line and cross components without requiring...
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5012216 |
Superconductive gravimeter
A superconductive gravimeter comprises a spool (12, 14, 16) and a circumferential magnet (20, 22, 24), both of which are covered with superconductive material (48, 52, 58, 60) except at the...
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4992656 |
Rotation, acceleration, and gravity sensors using quantum-mechanical matter-wave interferometry with neutral atoms and molecules
The invention is a neutral atom (and/or molecule) matter-wave interferometer (and/or set of interferometers) that can be used as an inertial sensor with a sensitivity exceeding that of conventional...
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4955232 |
Floated gravity gradiometer and method
An apparatus and method for measuring the vertical gradient of the vertical gravitational field using a gravity gradiometer comprising a housing containing a fluid, a float buoyantly supported...
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4935883 |
Apparatus and method for leveling a gravity measurement device
Apparatus and method for establishing a level plane and with respect to the level plane, vertically aligning an acceleration sensitive axis of a gravity measurement device (10). The gravity...
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4920313 |
Gravitational mass detector
A system which detects the presence and bearing of a mass M implemented by having a first field or wave interact with the motion of a charged mass m to produce a second field or wave which is...
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4841772 |
Three-axis superconducting gravity gradiometer
Each accelerometer includes a cylindrical proof mass made of a superconducting material. Each proof mass includes annular upper and lower hollowed out portions longitudinally surrounded by a...
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4718274 |
Gravity meter digitizer
A digitizer for a gravity meter having a rotatable gradient readout dial and a null indicator, the digitizer comprising a shaft position sensor attached to the readout dial for providing a digital...
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4602508 |
Continuous gravity gradient logging
A continuous gravimetry survey is carried out with a gravity logging tool having a column of fluid within the tool. First and second pressure sensors are located at spaced-apart axial positions...
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4581932 |
Tuned borehole gravity gradiometer
A tuned borehole gravity gradiometer comprises a dipole mass system having means for selectively tuning the sensitivity of the gravity gradiometer to detect variations in the earth's gravity...
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