Distributed acoustic sensing using low pulse repetition rates
AssigneeBaker Hughes Incorporated
InventorWilliam Johnston
Life of this patent
Estimating the term…
Abstract
A distributed acoustic sensing system and a method of obtaining acoustic levels using the distributed acoustic sensing system are described. The distributed acoustic sensing system includes an optical fiber, a light source to inject light into the optical fiber, and a photodetector 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. The system also includes a processor 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.
Claims18
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;
- 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.
A method of obtaining acoustic levels using a distributed acoustic sensing system, the method comprising:
- disposing an optical fiber in an area in which the acoustic levels are to be determined;
- injecting light into the optical fiber with a light source;
- sampling, using a photodetector, a DAS signal at each section of one or more sections of the optical fiber originating from two or more points within the section of the optical fiber over a period of time;
- and
- processing, using a processor, only a low frequency portion of the DAS signal, the processing including obtaining the acoustic levels at each of the one or more sections of the optical fiber over the period of time, the low frequency portion of the DAS signal being less than 10 Hz.
Dependencies are inferred from the claim text.