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    Clutter avoidance in wide-band cavity ring-down data acquisition
    11.
    发明申请
    Clutter avoidance in wide-band cavity ring-down data acquisition 有权

    公开(公告)号：US20210181092A1

    公开(公告)日：2021-06-17

    申请号：US16714536

    申请日：2019-12-13

    Applicant: Picarro, Inc.

    Inventor： John A. Hoffnagle ,  Chris W. Rella

    IPC: G01N21/31 ,  G01N33/00 ,  G01J3/42

    Abstract: Improved optical absorption spectroscopy of species having broad spectral features is provided by choosing frequencies to cover the spectral feature(s) of interest, where the frequencies are slightly adjusted as needed to avoid narrow spectral features from interfering chemical species (i.e., clutter). The resulting clutter avoidance provides improved optical spectroscopy of species having broad spectral features.

    Creating Mass Flow Parity in a Variant Multi-Channel Sampling System
    13.
    发明申请
    Creating Mass Flow Parity in a Variant Multi-Channel Sampling System 有权

    公开(公告)号：US20210156835A1

    公开(公告)日：2021-05-27

    申请号：US16691222

    申请日：2019-11-21

    Applicant: Picarro, Inc.

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

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

    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.

    Systems and methods for likelihood-based detection of gas leaks using mobile survey equipment
    14.
    发明授权
    Systems and methods for likelihood-based detection of gas leaks using mobile survey equipment 有权

    公开(公告)号：US10444108B1

    公开(公告)日：2019-10-15

    申请号：US16350419

    申请日：2018-11-12

    Applicant: Picarro Inc.

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

    IPC: G01M3/04 ,  G01N33/00 ,  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.

    Survey area indicators for gas leak detection
    17.
    发明授权
    Survey area indicators for gas leak detection 有权

    公开(公告)号：US09645039B1

    公开(公告)日：2017-05-09

    申请号：US13733864

    申请日：2013-01-03

    Applicant: Picarro Inc.

    Inventor： Sze Meng Tan ,  Chris W. Rella

    IPC: G01M3/28

    CPC classification number: G01M3/2807 ,  F02M65/006 ,  G01M3/007 ,  G01M3/04 ,  G01M3/16 ,  G01M3/24 ,  G01M3/26 ,  G01M3/28 ,  G01M3/38 ,  G06F15/00 ,  G06F17/30241

    Abstract: In some embodiments, content is generated that includes a street map, at least one path on the map indicating a route of travel by a mobile gas measurement device, and at least one indicator on the map that indicates a survey area for a potential gas leak source. The survey area adjoins the path and extends in a substantially upwind direction from the path. The survey area has a boundary 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 a gas leak from the potential source at one or more measurement points along the path satisfies a probability condition.

    Systems and methods for determining a gas leak detection survey area boundary
    18.
    发明授权
    Systems and methods for determining a gas leak detection survey area boundary 有权
    确定气体泄漏检测区域边界的系统和方法

    公开(公告)号：US09322735B1

    公开(公告)日：2016-04-26

    申请号：US13733868

    申请日：2013-01-03

    Applicant: Picarro Inc.

    Inventor： Sze Meng Tan ,  Chris W. Rella

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

    CPC classification number: G01M3/2807 ,  F02M65/006 ,  G01M3/007 ,  G01M3/04 ,  G01M3/16 ,  G01M3/24 ,  G01M3/26 ,  G01M3/28 ,  G01M3/38 ,  G06F15/00 ,  G06F17/30241

    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.

    Abstract translation: 在一些实施例中，采用至少一个处理器来确定测量区域的边界。 接收与测量区域相邻或外部的测量点的位置的数据，以及表示测量点的风向的数据。 测量区域的边界根据代表风向的数据确定，最大检测距离值代表从潜在的气体泄漏源估计的最大距离，其中可能检测到来自潜在源的气体泄漏。 确定边界，使得如果潜在的气体泄漏源位于测量区域中并且具有满足最小泄漏率条件的泄漏率，则在一个或多个测量点处的估计的气体泄漏检测概率满足 概率条件。

    Scanned 1-D gas analysis camera having a line pixel weighted for wind speed
    19.
    发明申请
    Scanned 1-D gas analysis camera having a line pixel weighted for wind speed 审中-公开
    扫描的1-D气体分析相机具有用于风速加权的线像素

    公开(公告)号：US20150059444A1

    公开(公告)日：2015-03-05

    申请号：US14534022

    申请日：2014-11-05

    Applicant: Picarro, Inc.

    Inventor： Chris W. Rella

    IPC: G01N33/00

    CPC classification number: G01N33/0011 ,  G01N1/02 ,  G01N1/2273 ,  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.

    Abstract translation: 获得通过气体羽流的横截面中的气体浓度图像（即，浓度与位置数据）。 这样的测量可以通过使用气体样品入口的2D阵列，或通过气体样品入口将1D阵列的气体样品入口移动来获得。 通过将气体浓度图像与通过气体浓度图像的表面的环境流量信息组合，可以估计来自泄漏源的泄漏速率（即，气体通量）。 通过填充两个或更多个气体样品储存室同时获取气体样品。 这是默认的操作模式，便于将其视为记录模式。 另一种操作模式是回放模式，其中将气体样品储存室中的气体样品依次提供给气体分析仪器。 通过线像素的气体采集可用于补偿垂直风速变化。

    Clutter avoidance in wide-band cavity ring-down data acquisition
    20.
    发明授权
    Clutter avoidance in wide-band cavity ring-down data acquisition 有权

    公开(公告)号：US11592388B2

    公开(公告)日：2023-02-28

    申请号：US16714536

    申请日：2019-12-13

    Applicant: Picarro, Inc.

    Inventor： John A. Hoffnagle ,  Chris W. Rella

    IPC: G01N21/31 ,  G01J3/42 ,  G01N33/00

    Abstract: Improved optical absorption spectroscopy of species having broad spectral features is provided by choosing frequencies to cover the spectral feature(s) of interest, where the frequencies are slightly adjusted as needed to avoid narrow spectral features from interfering chemical species (i.e., clutter). The resulting clutter avoidance provides improved optical spectroscopy of species having broad spectral features.

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