Invention Grant
- Patent Title: Apparatus for detecting low frequency electromagnetic field responses from a subsurface environment
- Patent Title (中): 用于检测来自地下环境的低频电磁场响应的装置
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Application No.: US13809146Application Date: 2011-07-07
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Publication No.: US09097816B2Publication Date: 2015-08-04
- Inventor: Svein Ellingsrud , Hans Roger Jensen , Geir Bjarte Havsgard
- Applicant: Svein Ellingsrud , Hans Roger Jensen , Geir Bjarte Havsgard
- Applicant Address: NO Trondheim
- Assignee: ELECTROMAGNETIC GEOSERVICES ASA
- Current Assignee: ELECTROMAGNETIC GEOSERVICES ASA
- Current Assignee Address: NO Trondheim
- Agency: Patterson Thuente Pedersen, P.A.
- Priority: GB1011548.3 20100708
- International Application: PCT/EP2011/061514 WO 20110707
- International Announcement: WO2012/004345 WO 20120112
- Main IPC: G01V3/12
- IPC: G01V3/12 ; G01D5/353
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.
Public/Granted literature
- US20130207661A1 LOW NOISE MARINE ELECTRIC FIELD SENSOR SYSTEM Public/Granted day:2013-08-15
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