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:
Jan. 26, 2016
Filed:
Jan. 16, 2012
Roger Ian Crickmore, Dorchester, GB;
Alastair Godfrey, Farnborough, GB;
Roger Ian Crickmore, Dorchester, GB;
Alastair Godfrey, Farnborough, GB;
OPTASENSE HOLDINGS LIMITED, , GB;
Abstract
This application describes methods and apparatus for fiber optic distributed acoustic sensing (DAS) where microstructured fiber (), such as holey fiber or photonic crystal fiber is used as the sensing fiber (). The microstructured fiber is configured so to provide at least one of enhanced sensitivity to a given incident acoustic signal; an enhanced non-linear optical power threshold and directional sensitivity. By configuring the microstructured fiber to be more compliant than an equivalent solid fiber and/or provide a large refractive index variation in response to applied strain, the response to a given acoustic stimulus may be larger than for the equivalent fiber, Providing a hollow core may allow higher optical powers and by providing a directionality to microstructured () allows the fiber to be used in a DAS system with a directional response.