Groenaas
Halvor Groenaas, Oslo NO
Patent application number | Description | Published |
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20090296519 | DETERMINING POSITIONING OF SURVEY EQUIPMENT USING A MODEL - To performing positioning of survey equipment, measurements of acoustic signals reflected from at least one boundary of a marine environment are received. The reflected acoustic signals are reflected from the at least one boundary in response to acoustic signaling originated by an acoustic source. A positioning model is updated based on the measurements of the acoustic signals, wherein the positioning model contains information relating to positions of components of a positioning system that includes the acoustic source and acoustic receiver | 12-03-2009 |
20100002538 | DETERMINING THE STRUCTURE OF A TOWED SEISMIC SPREAD ELEMENT - A technique includes obtaining a plurality of sets of measurements of distances between nodes located on a seismic spread element while the element is in tow. Each set is acquired in response to the operation of a different set of sources. The technique includes determining a three-dimensional structure of the seismic spread element while in tow based at least in part on the sets of measurements. | 01-07-2010 |
Halvor S. Groenaas, Oslo NO
Patent application number | Description | Published |
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20110116343 | Positioning a Seismic Acquisition System Using Electromagnetic Signals - An apparatus includes a towed seismic acquisition system and a ranging system. The ranging system is adapted to use electromagnetic ranging signals to indicate a location of one or more points on the towed seismic acquisition system. | 05-19-2011 |
20120147700 | Determining Streamer Depth and Sea Surface Profile - A technique includes receiving data indicative of acoustic measurements acquired by receivers disposed on a seismic receiver spread including at least one streamer. The technique includes processing the data in a machine to determine a depth and/or shaped of the spread. | 06-14-2012 |
Halvor Sehested Groenaas, Oslo NO
Patent application number | Description | Published |
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20100067326 | CETACEAN PROTECTION SYSTEM - An embodiment according to one or more aspects of the present disclosure for conducting a marine survey includes towing a survey spread comprising a plurality of receivers and an energy source along a selected course; emitting a signal from an energy source; receiving data from the plurality of receivers; detecting a cetacean from the received data; positioning the detected cetacean; limiting contact with the detected cetacean; and conducting a marine survey. | 03-18-2010 |
20110228636 | Cetacean Protection System - An embodiment according to one or more aspects of the present disclosure for conducting a marine survey includes a survey spread comprising a plurality of receivers and an energy source that is towed along a selected course while a signal is emitted from an energy source. A plurality of receivers receive data comprising a detection sampling frequency and a survey sampling frequency. The survey sampling frequency is monitored to detect a cetacean vocalization and to position the cetacean at least while conducting the seismic survey. Pursuant to the location of the cetacean actions can be taken to protect the cetacean and to minimize disruptions in conducting the seismic survey. | 09-22-2011 |
Halvor Sehested Groenaas US
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20120195163 | Determining a Streamer Position - A technique includes receiving data acquired by a seismic sensor on a spread of at least one streamer. The data are indicative of a seismic source signature that is produced by a source seismic to penetrate into the Earth to acquire geophysical information in connection with a seismic survey. The technique includes processing the data to determine a position on the streamer relative to a reference position not disposed on the streamer. | 08-02-2012 |
Halvor Sehested Groenaas, Asker NO
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20140305732 | High-Speed Image Monitoring of Baseplate Movement in A Vibrator - Systems, sensors, and methods for high-speed image monitoring of baseplate movement in a vibrator. The systems can include a baseplate defined by an area, disposable at a ground surface to direct a seismic force into the ground surface. The system can include a reaction mass coupled to and positioned above the baseplate to generate the seismic force at the baseplate. The system can include an actuator assembly coupled to the reaction mass to vibrate the reaction mass, as well as high-speed image units directed at the area of the baseplate. The high-speed image units can include photo detectors to sense a distribution of acceleration across the area of the baseplate, and a light source emit light to be sensed by the photo detectors. The system can also include a controller coupled to the actuator assembly, that drives the actuator assembly. | 10-16-2014 |