Patent ID: 9465126
Filing Date: 2016-10-11
CPC Classification: G01V

Claim Text:
1. A fibre optic distributed sensing apparatus for use in geophysical surveying involving stimulating an area of interest with a seismic source, said apparatus comprising: a source of electromagnetic radiation arranged to, in use, repeatedly launch interrogating electromagnetic radiation into an optic fibre deployed in said area of interest; a sampling detector for sampling electromagnetic radiation back-scattered from said optic fibre; and a processor arranged to process the back-scattered radiation to provide, for each of a plurality of longitudinal sensing portions of optic fibre, an indication of any incident acoustic signals affecting that sensing portion, wherein the sampling detector is arranged to acquire a plurality of diversity samples for each said longitudinal sensing portion from each launch of interrogating electromagnetic radiation and the processor is configured to, for each said longitudinal sensing portion: