Patent ID: 9634766
Date: 2017-04-25
CPC Classifications: G01V,H04B

Claim:
1. A distributed acoustic sensing system to obtain acoustic levels, comprising: an optical fiber; a light source configured to inject light into the optical fiber; a photodetector configured to sample a DAS signal in each section of one or more sections of the optical fiber resulting from two or more points within the section on the optical fiber over a period of time, wherein a sampling rate of less than or equal to 500 Hertz (Hz) is used to sample the DAS signal; and a processor configured to process only a low frequency portion of the DAS signal to obtain the acoustic levels at each of the one or more sections on the optical fiber over the period of time, the low frequency portion of the DAS signal being less than 10 Hz, wherein the processor determines the acoustic levels at each of the one or more areas based on: where DAS′ is the Hilbert transform of the DAS signal, Temp is a temperature component of the DAS signal, Acoust is an acoustic component of the DAS signal, and B is a constant.