The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 2015
Filed:
Jul. 07, 2011
Applicants:
Svein Ellingsrud, Trondheim, NO;
Hans Roger Jensen, Trondheim, NO;
Geir Bjarte Havsgard, Jakobsli, NO;
Inventors:
Svein Ellingsrud, Trondheim, NO;
Hans Roger Jensen, Trondheim, NO;
Geir Bjarte Havsgard, Jakobsli, NO;
Assignee:
ELECTROMAGNETIC GEOSERVICES ASA, Trondheim, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01V 3/12 (2006.01); G01D 5/353 (2006.01);
U.S. Cl.
CPC ...
G01V 3/12 (2013.01); G01D 5/35303 (2013.01); G01D 5/35338 (2013.01);
Abstract
An EM receiver instrument suitable for making underwater electric field measurements. The EM receiver comprises a dipole antenna; an AM modulator for applying modulation to a signal detected by the antenna; a fiber-optic voltage sensor and an application of AM demodulator for applying demodulation to the signal. The fiber-optic sensor may be an interferometric voltage sensor or a phase sensitive voltage sensor.