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    Creating Mass Flow Parity in a Variant Multi-Channel Sampling System
    32.
    发明公开
    Creating Mass Flow Parity in a Variant Multi-Channel Sampling System 审中-公开

    公开(公告)号：US20230204553A1

    公开(公告)日：2023-06-29

    申请号：US18115534

    申请日：2023-02-28

    Applicant: Picarro Inc.

    Inventor： Jeffrey Michael Headrick ,  Wei Jian Chin ,  Chris W. Rella

    IPC: G01N33/00 ,  G01F15/00 ,  G01F5/00

    CPC classification number: G01N33/0016 ,  G01F15/005 ,  G01F5/005

    Abstract: An equal mixture of gas flows from multiple inputs is provided to gas analysis instrumentation, despite the unequal gas flow properties of the inputs often seen in practice. E.g., due to unequal input sample line lengths. We provide gas flow symmetry into a gas manifold that provides the output(s) to the gas analysis instrument(s). Such symmetry has two parts—equal gas flow properties from a set of reference points (one reference point for each input) to the manifold, and equal pressures at the reference points. Such equal pressures can be provided for unequal input gas flow properties by having a bypass valve for each input controlled so as to equalize the pressures.

    Leak detection event aggregation and ranking systems and methods
    34.
    发明授权
    Leak detection event aggregation and ranking systems and methods 有权

    公开(公告)号：US11525819B1

    公开(公告)日：2022-12-13

    申请号：US17249795

    申请日：2021-03-12

    Applicant: Picarro Inc.

    Inventor： Sean MacMullin ,  Chris W. Rella ,  Aaron Van Pelt ,  Alex Balkanski ,  Yonggang He ,  Sze M. Tan ,  David Steele ,  Tim Clark

    IPC: G01N33/00 ,  G01M3/04

    Abstract: In some embodiments, data from multiple vehicle-based natural gas leak detection survey runs are used by computer-implemented machine learning systems to generate a list of natural gas leaks ranked by hazard level. A risk model embodies training data having known hazard levels, and is used to classify newly-discovered leaks. Hazard levels may be expressed by continuous variables, and/or probabilities that a given leak fits within a predefined category of hazard (e.g. Grades 1-3). Each leak is represented by a cluster of leak indications (peaks) originating from a common leak sources. Hazard-predictive features may include maximum, minimum, mean, and/or median CH4/amplitude of aggregated leak indications; estimated leak flow rate, determined from an average of leak indications in a cluster; likelihood of leak being natural gas based on other indicator data (e.g. ethane concentration); probability the leak was detected on a given pass; and estimated distance to leak source.

    Scanned 1-D gas analysis camera having a line pixel weighted for wind speed
    35.
    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：US10852281B2

    公开(公告)日：2020-12-01

    申请号：US16524139

    申请日：2019-07-28

    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
    36.
    发明授权
    Gas detection systems and methods using search area indicators 有权

    公开(公告)号：US10775262B1

    公开(公告)日：2020-09-15

    申请号：US16450970

    申请日：2019-06-24

    Applicant: Picarro Inc.

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

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

    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 detecting changes in emission rates of gas leaks in ensembles
    37.
    发明授权
    Systems and methods for detecting changes in emission rates of gas leaks in ensembles 有权

    公开(公告)号：US10386258B1

    公开(公告)日：2019-08-20

    申请号：US15144751

    申请日：2016-05-02

    Applicant: Picarro Inc.

    Inventor： David Steele ,  Chris W. Rella ,  Sze M. Tan ,  Sean MacMullin ,  Anders Nottrott

    IPC: G01M3/00 ,  G01M3/04

    Abstract: In some embodiments, computer-implemented systems/methods detect and/or quantify changes in emission rates of gas emission sources (e.g. natural gas leaks originating from underground distribution pipelines) using data from multiple vehicle-based measurement runs. Exemplary described methods aim to address the observation that large (e.g. 10×) changes in gas concentrations away from a source may be observed even in the absence of significant changes in source emission rate, due to changes in wind or other atmospheric conditions and local spatial variations in gas concentrations. Described methods are useful for identifying large increases in the emission rate(s) of known sources, for example due to frost heave or other dislocations. Multiple runs are performed along the same survey path in closely-related conditions (e.g. same time of day, same lanes), and a statistical test (e.g. a Kolmogorov-Smirnov test) is used to identify changes in concentration reflecting changes in emission rates.

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