Patent ID: 9494461
Filing Date: 2016-11-15
CPC Classification: G01H,G01V

Claim Text:
1. A distributed fiber optic acoustic sensing system comprising: a cable comprising an elongated body having an outer surface and a first optical fiber disposed on the outer surface at a first predetermined wrap angle; a first sheath layer on the outside of the elongated body and covering the elongated body and the first optical fiber; at least a second optical fiber wrapped around the outside of the first sheath layer at a second predetermined wrap angle that is different from the first predetermined wrap angle; a second sheath layer on the outside of the first sheath layer and covering the first sheath layer and the second optical fiber; and light transmitting and receiving means optically connected to said optical fibers for, respectively, transmitting optical signals into the optical fibers and receiving a backscattered component of said signals out of the optical fibers.