Patent · US Active

Apparatus for detecting low frequency electromagnetic field responses from a subsurface environment

US9097816B2 · kind B2 · utility

0Cited by

20References

18Claims

0Family size

Assignee

ELECTROMAGNETIC GEOSERVICES ASA · NO

Inventors

Svein Ellingsrud · Trondheim, NO
Hans Jensen · Dettingen, DE
Geir Bjarte Havsgard · Trondheim, NO

Key dates

Filing date	Jul 7, 2011
Grant date	Aug 4, 2015
Priority date	—
Expiry date	May 19, 2032

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/35338
WIPO fieldMeasurement
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.