Patent ID: 9429466
Filing Date: 2016-08-30
CPC Classification: G01H,G01V

Claim Text:
1. A distributed sensing system that comprises: a multi-mode optical fiber cable deployed for distributed sensing; a distributed acoustic sensing interrogator having a single-mode optical fiber that communicates light from a single transverse mode laser source; a mode field adapter that couples the light from the single-mode optical fiber to the multi-mode optical fiber cable; and a distributed temperature sensing interrogator, wherein the distributed acoustic sensing interrogator derives distributed acoustic measurements from Rayleigh backscattered light received from the multi-mode optical fiber cable, wherein the distributed acoustic sensing interrogator receives the Rayleigh backscattered light from the multi-mode optical fiber cable via the single-mode optical fiber, and wherein the distributed temperature sensing interrogator is coupled to the multi-mode optical fiber cable to derive distributed temperature measurements from backscattered light on a fiber that also provides said backscattered light to the distributed acoustic sensing interrogator.