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:
Jul. 16, 2019
Filed:
Aug. 15, 2011
Magnus Mcewen-king, Farnborough, GB;
David John Hill, Dorchester, GB;
Alastair Godfrey, Farnborough, GB;
Magnus McEwen-King, Farnborough, GB;
David John Hill, Dorchester, GB;
Alastair Godfrey, Farnborough, GB;
OPTASENSE HOLDINGS LIMITED, , GB;
Abstract
A system for moving object () detection is provided, the system comprising a fiber optic interrogator () adapted to provide distributed acoustic sensing on a optic fiber (), for example arranged along a border. The measurement signals from each of a plurality of sensing portions () of said fiber are analyzed to determined a characteristic of a Doppler shift. The characteristic of a Doppler shift may be a generally continuous decrease in detected frequency. By detecting the time at which the rate of change of frequency is at a maximum for each of the sensing portions the time of closest approach (ti, t, tt, t) of the object to those sensing portions can be determined with the sensing portion the object approaches closest to showing the greatest value of maximum rate of change of frequency. The distance of closest approach and velocity can be determined.