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8109142 |
Inertial sensing system with a curved base and a diamagnetic mass
An inertial sensing system includes a diamagnetic mass, a plurality of permanent magnets positioned to form a curved base, wherein the plurality of permanent magnets are configured to provide an...
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8074515 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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8033170 |
Gravity gradiometer
The present invention provides a method of tuning properties of a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer comprises a pair of first and...
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8026714 |
Accelerometer with enhanced DC stability
An accelerometer with improved immunity to sensitivity drift is disclosed. In some embodiments, the accelerometer comprises an actuator that induces a known acceleration on a reference frame. A...
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7980130 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7975544 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7968841 |
Force and acceleration sensor using four wave mixing technique
A sensor for measuring force, the sensor including: a light source; and a mixing medium in optical communication with the light source and exposed to the force; wherein four wave mixing of light...
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7954375 |
Inclined axis gravity gradiometer
Systems for and methods of detecting gravitational acceleration and gravity gradients are disclosed. The systems and methods include gravity gradiometers whose axes are substantially horizontal. In...
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7942054 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7938003 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7856329 |
Method and apparatus for processing an under-sampled chirped sinusoidal waveform using a complex-heterodyne
A method of processing data acquired by under-sampling a chirped, sinusoidal waveform comprises complex-heterodyning the under-sampled data with a chirped signal having characteristics similar to...
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7849739 |
Gravity gradiometer
A gravity gradiometer is described which comprises a pair of sensor bars arranged in housings. Transducers are arranged adjacent the bars for measuring movement of the bars in response to the...
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7823448 |
Actuatory and gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7814790 |
Gravity gradiometer
The present invention provides a method of tuning properties of a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer comprises a pair of first and...
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7788974 |
Gravity gradiometer
A gravity gradiometer is disclosed which has a sensor in the form of bars (41 and 42) which are supported on a mounting (5) which has a first mount section (10) and a second mount section (20). A...
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7788975 |
Accelerometer and rate sensor package for gravity gradiometer instruments
An accelerometer and rate sensor package to aid gravity gradiometers is provided. The accelerometer and rate sensor package is mounted directly on or within a gravity gradiometer instrument (GGI)....
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7714584 |
Gravity gradiometer
The present invention provides a gravity gradiometer for measuring components of the gravity gradient tensor. The gravity gradiometer includes at least one sensor mass for movement in response to a...
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7707883 |
Apparatus and method for improved light source and light detector for gravimeter
An instrument for measuring gravitational acceleration from within a borehole, the instrument including: a light source having a semiconductor that comprises a bandgap greater than about two...
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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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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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7444867 |
Accelerometer and rate sensor package for gravity gradiometer instruments
An accelerometer and rate sensor package to aid gravity gradiometers is provided. The accelerometer and rate sensor package is mounted directly on or within a gravity gradiometer instrument (GGI)....
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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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7266469 |
Method and article of manufacture for determining a rate of change of orientation of a plurality of fibers disposed in a fluid
A method and an article of manufacture for determining a rate of change of orientation of a plurality of fibers disposed in a fluid are provided. The method includes determining a first tensor...
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7222534 |
Optical accelerometer, optical inclinometer and seismic sensor system using such accelerometer and inclinometer
An optical accelerometer includes a beam and at least one optical fiber affixed to one side of the beam such that deflection of the beam changes a length of the optical fiber. A device for sensing...
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7069780 |
Gravity techniques for drilling and logging
Techniques for using gravity in applications such as drilling and logging. Techniques are present for (1) gravity well logging using gravity sensors arrays; (2) creating density pseudosections...
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6987460 |
Orientation device
Disclosed is an orientation device that may be deployed in a mechanical assembly such as a surveillance camera or enclosure to positively determine the physical orientation and/or attitude (tilt),...
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6931709 |
Method of joining non-metallic and metallic components
A method of attaching a first member of one of quartz and a ceramic to a metal member. The method includes creating a hole in the metal member, the hole being smaller in size than the size of the...
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6898970 |
Inertial navigation device for ion propulsion driven spacecraft
An extremely sensitive accelerometer suitable for use in extreme temperatures such as those encountered during space travel is formed by levitating a magnet in a box or sphere composed of...
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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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6772630 |
Micro-distance toss-up type absolute gravimeter
A micro-distance toss-up type absolute gravimeter comprises a vacuum container mounted on the ground, a reference mirror supported in the vacuum container, a drop mirror to be dropped within the...
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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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6671057 |
Gravity and differential gravity sensor, and system and method for monitoring reservoirs using same
A gravity sensor is disclosed which includes a first mass adapted to free fall when selectively released from an initial position. The mass has optical elements adapted to change a length of an...
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6615660 |
Real-time self-compensating gravity gradiometer instrument
A real-time self-compensating gravity gradiometer (GGI) of the type having an input plane (IP) includes a mass concentration (MC) that is moved along an orbital path (16) in the input plane (IP) 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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6575029 |
Gravity gradiometer accelerometers
This invention concerns improvements to gravity gradient instruments (GGI) and in particular to the accelerometers that are paired within these instruments. Accelerometers have a proof 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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6494091 |
Apparatus for measuring a gravitational attraction of the earth
Apparatus for measuring gravitational attraction of the Earth comprising a loop formed from a superconductor material. The loop being divided into a first portion and a second portion having a...
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6353311 |
Universal particle flux pressure converter
The design of Shaded Rotor devices to demonstrate the existence of a hypothetical Universal Particle Flux Field is presented. These devices should extract a measurable amount of energy from this...
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6314809 |
Gravity measurement using bose-einstein condensed vapors and atom interferometry
The invention uses coherent outputs from two or more Bose-Einstein condensates (BECs) to characterize the acceleration due to gravity. The condensates are created at two or more different heights...
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6298722 |
Rotary cam driven free fall dropping chamber mechanism
An improved gravimeter mechanism includes a mass balanced cam having mutually opposed camming surfaces for controlling the free fall of a measuring mass. The cam is attached to a camshaft which...
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6240779 |
Gravity-type horizontal shift sensing apparatus
A gravity-type horizontal shift sensing apparatus being mounted on and moved along with an object for efficiently sensing and measuring any difference in angle of inclination of the object when the...
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6079267 |
Method and apparatus for measuring gravitational acceleration utilizing a high temperature superconducting bearing
Gravitational acceleration is measured in all spatial dimensions with improved sensitivity by utilizing a high temperature superconducting (HTS) gravimeter. The HTS gravimeter is comprised of a...
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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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6014895 |
Determination of gravity by observation of density variations in gases
Apparatus to measure gravity comprising means to measure density variations in a material. Apparatus to measure gravity comprising means to measure the distribution of masses in a material. The...
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5970787 |
Downhole gravity tool
A tool for conducting gravimetry survey downhole in an earth formation includes a pressure vessel which houses a gravity sensor that is supported by a gimbal. The gravity sensor is aligned with...
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5892151 |
Differential interferometric ballistic gravity measurement apparatus and method
A differential interferometric ballastic gravity measurement apparatus and method for measuring differential gravity between separate points employs at least two separate gravity sensors having...
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5869759 |
Method and apparatus for regional gravity surveys using a GPS receiver
Method and apparatus for conducting regional gravity surveys, comprising a gravimeter module suspended below a helicopter and adapted to be lowered to the earth's surface for generating gravimeter...
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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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