USA as Represented by Secretary of the Navy

Hannah Marie Ogden

Brandon F Redding

Joseph B Murray

Matthew J Murray

Methods providing distributed temperature and strain measurements are disclosed. Brillouin pump laser pulses having a Brillouin pump frequency are coupled into a first end of an optical fiber. Brillouin Stokes and Anti-Stokes probe laser beams are coupled into a second end of the fiber. The Stokes probe laser beam has a Stokes probe frequency. The Anti-Stokes probe laser beam has an Anti-Stokes probe frequency. The Stokes and Anti-Stokes probe frequencies and the pump frequency are included in a Brillouin frequency band. A train of Rayleigh seed pulses are coupled into the fiber. Each of the seed pulses of the train has a respective different frequency included in a Rayleigh frequency band. Frequencies of the Brillouin frequency band are coupled to a Brillouin detector, and Rayleigh backscatter signals are coupled to a Rayleigh detector. Brillouin and Rayleigh detector outputs are used to calculate the measurements. Related sensors are also disclosed.

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Glen Burnie, MD, United States of America

Hannah Marie Ogden