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    Gas detection systems and methods using measurement position uncertainty representations
    23.
    发明授权
    Gas detection systems and methods using measurement position uncertainty representations 有权

    公开(公告)号：US10962438B2

    公开(公告)日：2021-03-30

    申请号：US16826265

    申请日：2020-03-22

    Applicant: Picarro Inc.

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

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

    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.

    Aggregate leak indicator display systems and methods
    24.
    发明授权
    Aggregate leak indicator display systems and methods 有权

    公开(公告)号：US10962437B1

    公开(公告)日：2021-03-30

    申请号：US16020874

    申请日：2018-06-27

    Applicant: Picarro Inc.

    Inventor： Anders Nottrott ,  Sean MacMullin ,  Sze M. Tan ,  Benjamin Cohen-Stead ,  Chris W. Rella

    IPC: G01M3/22 ,  G01N21/359 ,  G01N21/3504

    Abstract: In some embodiments, data from a vehicle-borne gas leak detection survey are used to generate an aggregate leak indication search area (LISA) indicator for a plurality of leak indications (measurement peaks) characterizing a single leak or localized set of leaks. A clustering algorithm (e.g. Markov, DBScan) may be used to group a set of indications into a cluster characterizing the leak. Leak indications may be pre-filtered for quality control before assignment to a cluster according to a number of parameters including background gas level, inter-peak distance, peak shape, wind speed, wind direction and/or variability, vehicle speed and/or acceleration, and/or a lower detection threshold for leak flow rate.

    Scanned 1-D gas analysis camera having a line pixel weighted for wind speed
    25.
    发明授权
    Scanned 1-D gas analysis camera having a line pixel weighted for wind speed 有权

    公开(公告)号：US10401341B2

    公开(公告)日：2019-09-03

    申请号：US14534022

    申请日：2014-11-05

    Applicant: Picarro, Inc.

    Inventor： Chris W. Rella

    IPC: G01N33/00 ,  G01N1/02 ,  G01N1/22 ,  G01N1/26

    Abstract: A gas concentration image (i.e., concentration vs. position data) in a cross section through a gas plume is obtained. Such measurements can be obtained by using a 2D array of gas sample inlets, or by moving a 1D array of gas sample inlets through the gas plume. By combining a gas concentration image with ambient flow information through the surface of the gas concentration image, the leak rate (i.e., gas flux) from the leak source can be estimated. Gas samples are simultaneously acquired by filling two or more gas sample storage chambers. This is the default operation mode, which is convenient to regard as recording mode. The other operating mode is a playback mode, where the gas samples in the gas sample storage chamber are sequentially provided to a gas analysis instrument. Gas collection via line pixels can be used to compensate for vertical wind speed variation.

    Gas Detection systems and methods using search area indicators
    26.
    发明授权
    Gas Detection systems and methods using search area indicators 有权

    公开(公告)号：US10337946B1

    公开(公告)日：2019-07-02

    申请号：US15418367

    申请日：2017-01-27

    Applicant: Picarro Inc.

    Inventor： Sze M. Tan ,  Eric R. Crosson ,  Chris W. Rella

    IPC: G01M3/04 ,  G01M3/28 ,  G01W1/00 ,  F02M65/00 ,  G01M3/00 ,  G01M3/16

    Abstract: In some embodiments, a computer system generates display content indicating a likely direction and estimated distance to a potential gas leak source. The content includes a street map and at least one search area indicator on the map that indicates a search area suspected to have a gas leak source. The search area indicator has an axis indicating a representative wind direction relative to a geo-referenced location of at least one gas concentration measurement point. The search area indicator also has a width relative to the axis. The width is indicative of a wind direction variability associated with a plurality of wind direction measurements in an area of the gas concentration measurement point. The axis also preferably has a length indicating an estimated maximum distance to the potential gas leak source.

    Systems and methods for likelihood-based mapping of areas surveyed for gas leaks using mobile survey equipment
    27.
    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
    29.
    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.

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