公开(公告)号：US20200149952A1

公开(公告)日：2020-05-14

申请号：US16190302

申请日：2018-11-14

Applicant: Saudi Arabian Oil Company ,  King Abdullah University of Science and Technology

Inventor： Frode Hveding ,  Islam Ashry ,  Mao Yuan ,  Mohd Sharizal Bin Alias ,  Boon Siew Ooi ,  Muhammad Arsalan

IPC: G01H9/00 ,  H01S3/115 ,  H01S3/10 ,  H01S3/067 ,  H01S3/16 ,  H01S3/08

Abstract: The subject matter of this specification can be embodied in, among other things, a method for remotely sensing vibration includes transmitting a collection of optical pulses through an optical fiber at a predetermined frequency, detecting a collection of backscattered Rayleigh traces from the optical fiber based on a vibration of the optical fiber at a vibration frequency at a location along the optical fiber, determining a normalized differential trace based on the collection of Rayleigh traces, determining, based on the normalized differential trace, the location in the optical fiber of the vibration, and determining, based on the raw Rayleigh traces, the vibration frequency.

公开(公告)号：US12203895B2

公开(公告)日：2025-01-21

申请号：US17603685

申请日：2020-04-20

Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Boon Siew Ooi ,  Islam Ashry ,  Yuan Mao

IPC: G01N29/24 ,  G01D5/353 ,  G01H9/00 ,  G01N29/14 ,  G01N29/48 ,  G01N33/00 ,  H04B10/071

Abstract: A method for determining tree infestation includes placing an optical fiber around a trunk of a tree; recording with a distributed acoustic sensor (DAS) box a Rayleigh signal reflected from the tree, along the optical fiber; processing the Rayleigh signal to obtain a processed signal; calculating a signal-to-noise ratio (SNR) of the processed signal for the tree; and comparing the SNR to a threshold value and counting an alarm if the SNR is larger than the threshold value. The SNR is defined as a ratio between (1) a maximum value of a processed signal and (2) a minimum value of the processed signal.

公开(公告)号：US20240295669A1

公开(公告)日：2024-09-05

申请号：US18662537

申请日：2024-05-13

Applicant: Saudi Arabian Oil Company ,  King Abdullah University of Science and Technology

Inventor： Frode Hveding ,  Islam Ashry ,  Mao Yuan ,  Mohd Bin Alias ,  Boon Siew Ooi ,  Muhammad Arsalan

IPC: G01V1/52 ,  E21B47/00 ,  G01D5/26 ,  G01V1/50 ,  G01V8/16

CPC classification number: G01V1/52 ,  E21B47/00 ,  G01D5/268 ,  G01V1/50 ,  G01V8/16

Abstract: The subject matter of this specification can be embodied in, among other things, a method for removing intermodal distortion that includes receiving a collection of distorted backscattered Rayleigh signals from a collection of modes of an optical fiber, where the collection of distorted backscattered Rayleigh signals are distorted by an intermodal coupling among the collection of modes, receiving a collection of distortion parameters that are descriptive of distortion effects of the intermodal coupling, and determining an undistorted backscattered Rayleigh signal based on the collection of distorted backscattered Rayleigh signals and the collection of distortion parameters.

公开(公告)号：US11209307B2

公开(公告)日：2021-12-28

申请号：US16832847

申请日：2020-03-27

Applicant: Saudi Arabian Oil Company ,  King Abdullah University of Science and Technology

Inventor： Frode Hveding ,  Islam Ashry ,  Mao Yuan ,  Mohd Sharizal Bin Alias ,  Boon Siew Ooi ,  Muhammad Arsalan

IPC: G01H9/00 ,  G01D5/353 ,  G01K11/3206 ,  G01N21/47 ,  G01K11/324

Abstract: The subject matter of this specification can be embodied in, among other things, a method that includes separating, from a few mode optical fiber, a collection of backscattered Rayleigh signals based on a vibration of the few mode optical fiber at a vibration frequency at a first location along the few mode optical fiber, separating, from the few mode optical fiber, a collection of backscattered Stokes Raman signals and Anti-Stokes Raman signals based on a temperature of the few mode optical fiber at a second location along the few mode optical fiber, detecting the separated Rayleigh signals and Raman signals, determining, based on detecting the collection of backscattered Rayleigh traces, at least one of the first location, the vibration frequency, and an amplitude of the vibration, and determining, based on the detecting the collection of backscattered Raman signals, the temperature at the second location.

公开(公告)号：US20210223139A1

公开(公告)日：2021-07-22

申请号：US16744918

申请日：2020-01-16

Applicant: Saudi Arabian Oil Company ,  King Abdullah University of Science and Technology

Inventor： Frode Hveding ,  Islam Ashry ,  Mao Yuan ,  Boon Siew Ooi

IPC: G01M11/00

Abstract: Systems and methods include a method for overcoming optical time domain reflectometry (OTDR) dead zone limitations by using a few-mode fiber (FMF). Optical pulses are transmitted by a transmitter of an OTDR system through a mode MUX/DEMUX into an FMF. Light signals directed by the FMF in a backward direction through the mode MUX/DEMUX are received by the OTDR system through N single-mode fiber (SMF) ports corresponding to N modes in the FMF. Light signals from N−1 dead-zone-free SMF ports are collected by the OTDR system. Losses are measured and faults are located in the FMF based at least on the light signals.

公开(公告)号：US10962408B2

公开(公告)日：2021-03-30

申请号：US16295212

申请日：2019-03-07

Applicant: Saudi Arabian Oil Company ,  King Abdullah University of Science and Technology

Inventor： Frode Hveding ,  Islam Ashry ,  Mao Yuan ,  Mohd Sharizal Bin Alias ,  Boon Siew Ooi ,  Muhammad Arsalan

IPC: G01H9/00

Abstract: Systems and methods include a number of optical pulses are transmitted by transmitting, by a distributed acoustic sensor (DAS), where the optical pulses are transmitted at an input port associated with a multimode fibers (MMF) used by the DAS, and where the fundamental mode of the MMF is excited. A number of backscattered Rayleigh signals are collected by the DAS. The Rayleigh signals are recorded as an output intensity profile. A position along the MMF that is subject to vibrations and corresponding vibration parameters are determined by analyzing the recorded output intensity profile.