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.:

US 10775425 B1

Date of Patent:

Sep. 15, 2020

Filed:

Jun. 23, 2016

Monitoring of power cables with distributed fibre optic sensing

Applicant:

Optasense Holdings Limited, Farnborough, Hampshire, GB;

Inventor:

Alastair Godfrey, Farnborough, GB;

Assignee:

OPTASENSE HOLDINGS LIMITED, Hampshire, GB;

Attorney:

McDonnell Boehnen Hulbert & Berghoff LLP

Primary Examiner:

Raul J Rios Russo

Int. Cl.

CPC ...

G01B 7/14 (2006.01); G01B 7/30 (2006.01); G01R 33/02 (2006.01); G01R 31/08 (2020.01); G01R 33/032 (2006.01); G01L 1/24 (2006.01); G01D 5/56 (2006.01); G01D 5/353 (2006.01); G01R 31/58 (2020.01); G01D 5/14 (2006.01); G01D 5/12 (2006.01); G01R 33/04 (2006.01); G01R 33/07 (2006.01); G02B 6/44 (2006.01); H02G 9/02 (2006.01); G01B 7/00 (2006.01); G02B 6/50 (2006.01);

U.S. Cl.

CPC ...

G01R 31/083 (2013.01); G01D 5/12 (2013.01); G01D 5/14 (2013.01); G01D 5/145 (2013.01); G01D 5/147 (2013.01); G01D 5/353 (2013.01); G01D 5/35338 (2013.01); G01D 5/56 (2013.01); G01L 1/242 (2013.01); G01R 31/081 (2013.01); G01R 31/58 (2020.01); G01R 33/02 (2013.01); G01R 33/0327 (2013.01); G01R 33/04 (2013.01); G01R 33/072 (2013.01); G02B 6/4416 (2013.01); G01B 7/003 (2013.01); G01B 7/14 (2013.01); G01B 7/30 (2013.01); G02B 6/506 (2013.01); H02G 9/02 (2013.01);

Abstract

This application relates to methods and apparatus for monitoring power cables () carrying multiple AC phases to detect deformation of the power cable. A distributed fibre optic interrogator unit () is used to interrogate a sensing optical fibre () coupled to the power cable to provide a measurement signal from each of a plurality of longitudinal sensing portions of the sensing optical fibre. An analyser () is configured to analyse the measurements signals to detect a characteristic of an imbalance in magnetic fields. The characteristic may be a signal component with a characteristic frequency related to the power frequency and number of AC phases, the sensing optical fibre may be sensitised to magnetic fields and the characteristic frequency may be 2n times the power frequency where n is the number of phases, e.g. six times the power frequency for three phase AC.

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