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9038457 Quadrupole responder for OQR-type gravity gradiometer  
A quadrupole responder for an OQR-type gravity gradiometer comprises a housing, and a mass quadrupole positioned within the housing. The mass quadrupole has a pair of sides, and also has a center...
9038456 Gravity gradiometer  
A gravity gradiometer having at least three differential accelerometers with a low response to linear accelerations and at least six angular accelerometers that give it the capability of measuring...
9002648 Method and apparatus for precise positioning of a borehole measurement instrument  
A system and method for use in a downhole tool having distance measurement, feature detection, and primary measurement devices positioned therein are provided. In one example, the method includes...
8978465 Interferometric gradiometer apparatus and method  
A gravity gradient is measured interferometrically from two light beams which each reflect from both of two freefalling test masses. The light beams project in beam arms which remain equal in...
8931341 Test mass and method for interferometric gravity characteristic measurement  
A test mass used for light beam interferometric gravity characteristic measurement has a center of mass located equidistant and colinear with optical center points of two oppositely reflecting...
8867026 Chip-scale optomechanical gravimeter  
An method and apparatus for measuring gravitational force are described where at least one first radiation can be provided to at least one optomechanical oscillator, the at least one...
8818748 Posture sensor automatic calibration  
A system and method automatically calibrate a posture sensor, such as by detecting a walking state or a posture change. For example, a three-axis accelerometer can be used to detect a patient's...
8661894 Microgravimeter for geophysical prospecting  
An apparatus and a method for measuring the gravitational acceleration on the ground, for example adapted to geophysical explorations applied to mining, including a base frame, a resonator having...
8387456 Gravity gradient sensor  
A gravimeter for detecting a gravity difference between two points is disclosed. The gravimeter comprises an interferometric arrangement wherein the length of a reference arm is dependent upon the...
8347711 Atom-interferometric, stepped gravity gradient measuring system  
A full-tensor, gravity gradient measuring system is disclosed that is based on atom interferometry. Each axis in the three-axis measuring system is served by a different gravity gradiometer, where...
8286485 Gravimeter launch mechanism  
A gravimeter that utilizes an electromagnetic launcher for enabling a free-fall of a test mass is disclosed. The electromagnetic launcher propels the test mass upward such that the test mass...
8230737 Gravity sensor and electronic device using the same  
A gravity sensor includes a chamber, a number of receiving holes, an electrically insulative liquid, a number of pressure sensors, and a number of sealing elements. The receiving holes are defined...
8201448 Gravity gradiometer with torsion flexure pivots  
A quadrupole responder for an OQR-type gravity gradiometer comprises a housing, and a mass quadrupole positioned within the housing. The mass quadrupole has a pair of sides, and also has a center...
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...
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...
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...
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...
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...
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...
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...
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....
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...
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...
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...
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...
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...
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...
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)....
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...
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...
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...
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...
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....
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...
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)....
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...
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...
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...
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...
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...
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),...
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...
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...
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...
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...
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...
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...
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)...
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,...
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...

Matches 1 - 50 out of 220 1 2 3 4 5 >