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    Systems and methods for likelihood-based mapping of areas surveyed for gas leaks using mobile survey equipment
    11.
    发明授权
    Systems and methods for likelihood-based mapping of areas surveyed for gas leaks using mobile survey equipment 有权

    公开(公告)号：US10126200B1

    公开(公告)日：2018-11-13

    申请号：US15462533

    申请日：2017-03-17

    Applicant: Picarro Inc.

    Inventor： David Steele ,  Sze M. Tan ,  Chris W. Rella

    IPC: G01M3/04 ,  G01W1/02 ,  G01N25/20

    Abstract: In some embodiments, vehicle-based natural gas leak detection methods are used to generate 2-D spatial distributions (heat maps) of gas emission source probabilities and surveyed area locations using measured gas concentrations and associated geospatial (e.g. GPS) locations, wind direction and wind speed, and atmospheric condition data. Bayesian updates are used to incorporate the results of one or more measurement runs into computed spatial distributions. Operating in gas-emission plume space rather than raw concentration data space allows reducing the computational complexity of updating gas emission source probability heat maps. Gas pipeline location data and other external data may be used to determine the heat map data.

    Systems and methods for likelihood-based mapping of areas surveyed for gas leaks using mobile survey equipment
    12.
    发明授权
    Systems and methods for likelihood-based mapping of areas surveyed for gas leaks using mobile survey equipment 有权

    公开(公告)号：US09599529B1

    公开(公告)日：2017-03-21

    申请号：US14139388

    申请日：2013-12-23

    Applicant: Picarro Inc.

    Inventor： David Steele ,  Sze M. Tan ,  Chris W. Rella

    IPC: G01N31/00 ,  G01M3/04

    CPC classification number: G01N33/0004 ,  G01M3/04 ,  G01N33/0075

    Abstract: In some embodiments, vehicle-based natural gas leak detection methods are used to generate 2-D spatial distributions (heat maps) of gas emission source probabilities and surveyed area locations using measured gas concentrations and associated geospatial (e.g. GPS) locations, wind direction and wind speed, and atmospheric condition data. Bayesian updates are used to incorporate the results of one or more measurement runs into computed spatial distributions. Operating in gas-emission plume space rather than raw concentration data space allows reducing the computational complexity of updating gas emission source probability heat maps. Gas pipeline location data and other external data may be used to determine the heat map data.

    Gas detection systems and methods using measurement position uncertainty representations
    13.
    发明授权
    Gas detection systems and methods using measurement position uncertainty representations 有权

    公开(公告)号：US10598562B2

    公开(公告)日：2020-03-24

    申请号：US14948287

    申请日：2015-11-21

    Applicant: Picarro Inc.

    Inventor： David Steele ,  Chris W. Rella ,  Sze M. Tan ,  Aaron Van Pelt

    IPC: G01M3/22 ,  G01P13/02 ,  G01P5/02 ,  F17D5/02 ,  G01M3/04 ,  G01C21/36

    Abstract: In some embodiments, a natural gas leak detection system generates display content including indicators of remote and local potential leak source areas situated on a map of an area of a gas concentration measurement survey performed by a vehicle-borne device. The remote area may be shaped as a wedge extending upwind from an associated gas concentration measurement point. The local area graphically represents a potential local leak source area situated around the gas concentration measurement point, and having a boundary within a predetermined distance (e.g. 10 meters) of the gas concentration measurement point. The local area may be represented as a circle, ellipse, or other shape, and may include an area downwind from the measurement point. Size and/or shape parameters of the local area indicator may be determined according to survey vehicle speed and direction data, and/or wind speed and direction data characterizing the measurement point.

    Systems and methods for determining a survey area for gas leak detection
    15.
    发明授权
    Systems and methods for determining a survey area for gas leak detection 有权

    公开(公告)号：US10330555B1

    公开(公告)日：2019-06-25

    申请号：US15137550

    申请日：2016-04-25

    Applicant: Picarro Inc.

    Inventor： Sze M. Tan ,  Chris W. Rella

    IPC: G01M3/04 ,  G01M3/00 ,  G01M3/16 ,  F02M65/00

    Abstract: In some embodiments, at least one processor is employed to determine a boundary of a survey area. Data representative of the locations of measurement points adjacent to or outside of the survey area is received, as well as data representative of wind direction at the measurement points. The boundary of the survey area is determined according to the data representative of wind direction and a maximum detection distance value representative of an estimated maximum distance from a potential gas leak source at which a gas leak from the potential source can be detected. The boundary is determined such that if the potential gas leak source is located in the survey area and has a rate of leakage meeting a minimum leak rate condition, then an estimated probability of detection of the gas leak at one or more of the measurement points satisfies a probability condition.

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