公开(公告)号：US11906394B2

公开(公告)日：2024-02-20

申请号：US17046539

申请日：2019-04-04

Applicant: Hifi Engineering Inc.

Inventor： Arne Dankers ,  Seyed Ehsan Jalilian

IPC: G01M3/24 ,  E21B47/107 ,  E21B47/117 ,  G01D5/353

CPC classification number: G01M3/243 ,  E21B47/107 ,  E21B47/117 ,  G01D5/353

Abstract: There is described a method of locating an area of interest in a conduit, comprising: measuring multiple acoustic signals at multiple locations along the conduit; for each acoustic signal, determining its autocorrelation; and applying a relationship to the determined autocorrelations to estimate a location of the area of interest, wherein the relationship is between autocorrelations of acoustic signals measured in a modelled conduit and modelled areas of interest in the modelled conduit, wherein it is assumed that acoustic signals propagating along the modelled conduit reflect from at least one point in the modelled conduit.

公开(公告)号：US11680829B2

公开(公告)日：2023-06-20

申请号：US17869671

申请日：2022-07-20

Applicant: HIFI ENGINEERING INC.

Inventor： Adekunle Adeyemi ,  Seyed Ehsan Jalilian

IPC: G01D5/30 ,  G01D5/353 ,  G01H9/00 ,  G01K11/3206 ,  G01L1/24

CPC classification number: G01D5/35361 ,  G01H9/004 ,  G01K11/3206 ,  G01L1/246

Abstract: There is provided a system for determining multiple baselines for detecting events in a conduit. The system comprises an optical fiber interrogator for interrogating optical fiber; and one or more processors communicative with the optical fiber interrogator and memory having stored thereon computer program code configured, when executed by the one or more processors, to cause the one or more processors to perform a method. The method comprises, for each of multiple channels of the conduit, each channel comprising a portion of the conduit: obtaining phase data for the channel, the phase data being obtained by causing the optical fiber interrogator to interrogate optical fiber positioned alongside the conduit; and determining one or more baselines from the phase data. As a result, events in the conduit may be detected with fewer false positives.

公开(公告)号：US20220364888A1

公开(公告)日：2022-11-17

申请号：US17869671

申请日：2022-07-20

Applicant: HIFI ENGINEERING INC.

Inventor： Adekunle Adeyemi ,  Seyed Ehsan Jalilian

IPC: G01D5/353 ,  G01H9/00 ,  G01K11/3206 ,  G01L1/24

Abstract: There is provided a system for determining multiple baselines for detecting events in a conduit. The system comprises an optical fiber interrogator for interrogating optical fiber; and one or more processors communicative with the optical fiber interrogator and memory having stored thereon computer program code configured, when executed by the one or more processors, to cause the one or more processors to perform a method. The method comprises, for each of multiple channels of the conduit, each channel comprising a portion of the conduit: obtaining phase data for the channel, the phase data being obtained by causing the optical fiber interrogator to interrogate optical fiber positioned alongside the conduit; and determining one or more baselines from the phase data. As a result, events in the conduit may be detected with fewer false positives.

公开(公告)号：US11428600B2

公开(公告)日：2022-08-30

申请号：US16625640

申请日：2018-06-29

Applicant: Hifi Engineering Inc.

Inventor： Arne Dankers ,  Seyed Ehsan Jalilian ,  David Westwick

IPC: G01M3/24 ,  G01H9/00

Abstract: Methods, systems, and techniques for determining whether an acoustic event lias occurred along a fluid conduit iliat lias acoustic sensors positioned along its length. For each of the sensors, a processor is used to determine a linear relationship between a measured acoustic signal measured using the sensor and a white noise acoustic source located along a longitudinal segment of the fluid conduit overlapping the sensor. From the linear relationship, the processor determines an acoustic path response that includes an acoustic response of the longitudinal segment and an acoustic source transfer function dial transforms the white noise acoustic source. Over time, variations in the acoustic path responses and/or acoustic source transfer functions are monitored. When the event threshold is exceeded, the acoustic event is identified as having occurred along the longitudinal segment corresponding to the acoustic path response or acoustic source transfer function that varied in excess of the event threshold.

公开(公告)号：US11313744B2

公开(公告)日：2022-04-26

申请号：US16271623

申请日：2019-02-08

Applicant: Hifi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian

IPC: G01B9/02 ,  G01L1/24 ,  E21B47/007 ,  E21B47/135 ,  G02B6/02 ,  F17D5/00 ,  F17C13/02

Abstract: A system and method for detecting dynamic strain of a housing. The system includes an optical fiber linearly affixed along a surface of a length of the housing and an interrogator comprising a laser source and a photodetector. The optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths with a segment of the optical fiber extending between the FBGs. The segment of the optical fiber is linearly affixed along the surface of the housing. The interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs. The interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.

公开(公告)号：US11199393B2

公开(公告)日：2021-12-14

申请号：US15868766

申请日：2018-01-11

Applicant: Hifi Engineering Inc.

Inventor： Brian H. Moore ,  Walter Jeffrey Shakespeare ,  Phillip William Wallace ,  Viet Hoang ,  Chris Henrikson ,  Ajay Sandhu ,  Adrian Dumitru ,  Thomas Clement ,  Dongliang Huang ,  Seyed Ehsan Jalilian

IPC: G01B11/16 ,  G01D5/353 ,  G01H9/00 ,  G01K11/3206 ,  G01L1/24

Abstract: There is described a method for interrogating optical fiber comprising fiber Bragg gratings (“FBGs”), using an optical fiber interrogator. The method comprises (a) generating an initial light pulse from phase coherent light emitted from a light source, wherein the initial light pulse is generated by modulating the intensity of the light; (b) splitting the initial light pulse into a pair of light pulses; (c) causing one of the light pulses to be delayed relative to the other of the light pulses; (d) transmitting the light pulses along the optical fiber; (e) receiving reflections of the light pulses off the FBGs; and (f) determining whether an optical path length between the FBGs has changed from an interference pattern resulting from the reflections of the light pulses.

公开(公告)号：US20210088188A1

公开(公告)日：2021-03-25

申请号：US16921093

申请日：2020-07-06

Applicant: Hifi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian ,  Oleksiy Pletnyov

IPC: F17D5/02 ,  G01M3/28

Abstract: Various embodiments provide a method of simulating a leak in a pipeline. The method includes: receiving a fluid stream from a fluid supply; and outputting the received fluid stream through an outlet such that the received fluid stream hits an outer surface of the pipeline at a location opposite the outlet such that a vibration is caused in the pipeline. Some other embodiments provide a corresponding system for simulating a leak in a pipeline, and a corresponding outlet for coupling a conduit to a pipeline.

公开(公告)号：US10584960B2

公开(公告)日：2020-03-10

申请号：US16081850

申请日：2016-03-01

Applicant: Hifi Engineering Inc.

Inventor： Seyed Ehsan Jalilian ,  John Hull ,  Daniel Huang ,  Adekunle Adeyemi

IPC: G01B11/16 ,  G01L1/24 ,  G01M3/00 ,  G01M3/24 ,  G01M3/38 ,  G01D5/353 ,  G01K11/32 ,  G01B21/32 ,  G01H9/00

Abstract: Methods, systems, and techniques for determining whether an event has occurred from dynamic strain measurements involve determining, using a processor, at least one event parameter from a signal representing the dynamic strain measurements, and then having the processor use the at least one event parameter to determine whether the event has occurred. The at least one event parameter is any one or more of a measure of magnitude of the signal, frequency centroid of the signal, filtered baseline of the signal, harmonic power of the signal, and time-integrated spectrum flux of the signal.

公开(公告)号：US10473541B2

公开(公告)日：2019-11-12

申请号：US15323932

申请日：2014-07-04

Applicant: Hifi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian

IPC: G01B9/02 ,  G01L1/24 ,  G01D5/353

Abstract: A device and system for detecting dynamic strain. The device comprises a longitudinally extending carrier and an optical fiber embedded along an outer surface of a length of the carrier. The optical fiber comprises at least one pair of fiber Bragg gratings (FBGs) tuned to reflect substantially identical wavelengths. The system comprises the device and an interrogator comprising a laser source and a photodetector. The interrogator is configured to perform interferometry by shining laser light along the optical fiber and detecting light reflected by the FBGs. The interrogator outputs dynamic strain measurements based on interferometry performed on the reflected light.

公开(公告)号：US20190212212A1

公开(公告)日：2019-07-11

申请号：US16358066

申请日：2019-03-19

Applicant: Hifi Engineering Inc.

Inventor： John Hull ,  Seyed Ehsan Jalilian

IPC: G01K11/32 ,  G01N25/16 ,  G01H9/00 ,  G01K1/20 ,  G01B11/16

CPC classification number: G01K11/32 ,  G01B11/161 ,  G01H9/004 ,  G01K1/20 ,  G01N21/45 ,  G01N25/16

Abstract: Described are methods and systems using optical fiber interferometry to sense interference causing events in a region of interest and differentiate between a strain event and a thermal event. Other methods and systems relate to the use of optical fiber interferometry for determining temperature offset in a region of interest and using the determined temperature offset for determining temperature in the region of interest.