CPC G01H 9/004 (2013.01) [G06N 7/01 (2023.01); G06V 10/28 (2022.01); G06V 10/449 (2022.01); G06T 2207/30181 (2013.01)] | 2 Claims |
1. A method of operating a distributed fiber optic sensing (DFOS)/distributed acoustic sensing (DAS) system to determine perpendicular distance(s) from a DAS sensing fiber to vibration sources said method comprising:
operating the DAS system to measure baseline vibration levels and event characteristics at different perpendicular distances from locations along a length of sensing optical fiber that is part of the DAS system and collect a training dataset to establish canonical joint probability distribution of perpendicular distances from the sensing optical fiber and observed intensity;
integrating the measured baseline vibration levels and respective perpendicular distances from locations along the length of the sensing optical fiber to a geographic map;
generating a database of vibration intensity profiles for each perpendicular distance and location along the length of the sensing optical fiber;
determining background traffic vibrations in the database of vibration intensity profiles and removing same according to a median filtering methodology;
detecting a vibration through the effect of the DAS and determining a perpendicular distance from the sensing optical fiber of a source of the detected vibration; and
wherein the perpendicular distance determination is made from a DFOS stream of waterfall plots resulting from operation of the DAS system;
wherein the perpendicular distance determination includes an image binarization of the stream of waterfall plots; and
wherein the perpendicular distance determination includes generating an intensity profile at each perpendicular location using a join probability map by a Kernel Density or Gaussian Process Regression (GPR) process.
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