Patent application number | Description | Published |
20090293611 | Gravity Gradiometer - A gravity gradiometer and method for forming a pivot flexure web for a gradiometer is disclosed. The gradiometer has measurement bars | 12-03-2009 |
20100005882 | 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 second transversely arranged sensor masses that are arranged for movement about an axis and relative to each other in response to a gravity gradient. The gravity gradiometer further comprises first and second capacitors for sensing and influencing the movement of the first and second sensor masses. The method comprising applying a bias voltage to at least one of the capacitors for generating an electrostatic force which acts on one of the sensor masses and thereby influences the movement of that sensor mass. | 01-14-2010 |
20100071462 | 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 second transversely arranged sensor masses that are arranged for movement about an axis and relative to each other in response to a gravity gradient. The gravity gradiometer further comprises first and second capacitors for sensing and influencing the movement of the first and second sensor masses. The method comprising applying a bias voltage to at least one of the capacitors for generating an electrostatic force which acts on one of the sensor masses and thereby influences the movement of that sensor mass. | 03-25-2010 |
20100095765 | Gravity Gradiometer - A gravity gradiometer is disclosed which has a sensor in the form of bars ( | 04-22-2010 |
20100095766 | Gravity Gradiometer - A gravity gradiometer is disclosed which has a sensor in the form of bars ( | 04-22-2010 |
20100107756 | Gravity Gradiometer - A gravity gradiometer is disclosed which has a sensor in the form of bars ( | 05-06-2010 |
20100154536 | GRAVITY GRADIOMETER - A gravity gradiometer is disclosed which has a sensor in the form of bars ( | 06-24-2010 |
20100154537 | Gravity Gradiometer - A gravity gradiometer is disclosed which has a sensor in the form of bars ( | 06-24-2010 |
20110265563 | DETECTOR FOR DETECTING A GRAVITY GRADIENT - The present disclosure provides a gravity gradiometer for detecting a gravity gradient. The gravity gradiometer comprises at least two sensor masses that are pivotable about respective axes and each experience a change in torque in response to a change in gravity gradient whereby the at least two sensor masses move relative to each other in response to the change in gravity gradient and wherein a signal indicative of the gravity gradient is generated in response to the relative movement of the at least two sensor masses. Further, the gravity gradiometer comprises an acceleration sensor for sensing an acceleration associated with an external acceleration applied to the gravity gradiometer. The gravity gradiometer also comprises an actuator for generating an adjustment force that is dependent on an acceleration sensed by the acceleration sensor. The adjustment force is also dependent on a mechanical response parameter associated with at least one of the at least two sensor masses. The adjustment force is applied such that a difference between the magnitudes of the torques experienced by the at least two sensor masses in response to the change in gravity gradient is reduced. | 11-03-2011 |
20130055808 | GRAVITY GRADIOMETER WITH CORRECTION OF EXTERNAL DISTURBANCE - The present disclosure provides a method of detecting a change in gravity gradient using a gravity gradiometer. The gravity gradiometer comprises a detector for detecting the change in gravity gradient. The gravity gradiometer further comprises a sensor for generating a disturbance signal in response to an external disturbance. The method comprises the steps of exposing the gravity gradiometer to the external disturbance during operation of the gravity gradiometer. Further, the method comprises the steps of detecting the disturbance signal and receiving an output signal from the detector of the gravity gradiometer. The method also comprises the step of numerically correcting the output signal for an impact that a component of the gravity gradiometer experiences, as a consequence of the external disturbance using a response parameter that associates the external disturbance with a disturbance experienced by that component. | 03-07-2013 |