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公开(公告)号：US11092493B2
公开(公告)日：2021-08-17
申请号：US16714518
申请日：2019-12-13
Applicant: Picarro, Inc.
Inventor： Alejandro Dario Farinas , John A. Hoffnagle , Chris W. Rella , Sze Meng Tan
Abstract: Improved cavity enhanced absorption spectroscopy is provided using a piecewise tunable laser by using a lookup table for laser tuning that is configured specifically for this application. In preferred embodiments this is done in combination with a laser control strategy that provides precise wavelength determination using cavity modes of the instrument as a reference.
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2.发明申请公开(公告)号：US20200049556A1
公开(公告)日：2020-02-13
申请号：US16399431
申请日：2019-04-30
Applicant: Picarro, Inc.
Inventor： Chris W. Rella , Hongbing Chen , Derek Gregory Fleck , John A. Hoffnagle , James Ian Lee , Gerald Thomas Sornsen , Sze Meng Tan
Abstract: Interleaved data acquisition in optical spectroscopy is used to provide interference correction for time-varying interference. Measurements at a reference frequency are used to provide an estimate of the interference. These reference measurements are interleaved with the remaining measurements in order to provide estimates of the interference vs. time at relevant times. The interference being corrected can be spectrally structured or unstructured.
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公开(公告)号：US09823231B1
公开(公告)日：2017-11-21
申请号：US14319236
申请日：2014-06-30
Applicant: Picarro Inc.
Inventor： David Steele , Sze M. Tan
IPC: G01N33/00 , G01M3/04 , G01M3/22 , G01N21/3504
CPC classification number: G01N33/0062 , G01M3/04 , G01M3/22 , G01N21/3504 , G01N33/0004 , G01N33/0009
Abstract: In some embodiments, vehicle-based natural gas leak detection methods include assembling a collection of measured concentration peaks originating from a common natural gas leak according to wind direction, wind variability and inter-peak distance data, and selecting from the collection a subset of one or more representative peaks for display. Assigning peaks to a collection may be performed according to a peak overlap condition dependent upon a scaling (overlap) factor which scales the spatial reach of a peak, and according to a wind condition which determines whether a downwind event points toward an upwind event. The scaling factor may depend on wind variability and on an orientation of an inter-peak vector relative to a representative wind direction. Peak filtering is particularly useful in urban environments, where buildings channel gas plumes and one leak may lead to sequential detections of multiple concentration peaks along a path.
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4.发明授权公开(公告)号：US09599597B1
公开(公告)日：2017-03-21
申请号：US14139348
申请日：2013-12-23
Applicant: Picarro Inc.
Inventor： David Steele , Sze M. Tan , Chris W. Rella
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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5.发明授权公开(公告)号：US09470517B1
公开(公告)日：2016-10-18
申请号：US13866660
申请日：2013-04-19
Applicant: Picarro, Inc.
Inventor： Chris W. Rella
CPC classification number: G01N33/0062 , G01N1/26
Abstract: Repeated simultaneous concentration measurements at spatially separated points are used to provide information on the lateral spatial extent of a gas plume. More specifically the spatial correlations in this data provide this information. Fitting a gas plume model directly to this multi-point data can provide good estimates of total plume emission. The distance between the plume source and the measurement points does not need to be known to provide these estimates. It is also not necessary to perform any detailed atmospheric modeling.
Abstract translation: 在空间分离的点上重复的同时浓度测量被用于提供关于气体羽流的横向空间范围的信息。 更具体地说，该数据中的空间相关性提供了该信息。 将气体羽毛模型直接装配到该多点数据可以提供总羽流发射的良好估计。 不需要知道羽流源与测量点之间的距离来提供这些估计值。 也不需要进行任何详细的大气建模。
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Patent Agency Ranking
6.发明申请Methods for gas leak detection and localization in populated areas using two or more tracer measurements 审中-公开使用两次或多次示踪剂测量的人口稠密地区气体泄漏检测和定位方法公开(公告)号：US20160216172A1
公开(公告)日：2016-07-28
申请号：US15088885
申请日：2016-04-01
Applicant: Picarro, Inc.
Inventor： Chris W. Rella , Eric R. Crosson , Michael R. Woelk , Sze Meng Tan , Yonggang He , David Steele
CPC classification number: G01N33/0009 , G01M3/22 , G01M3/38 , G01N21/01 , G01N21/3504 , G01N21/39 , G01N2021/0314 , G01N2201/025
Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using two or more tracer measurements of isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. Qualitative source identification is provided. These methods can be practiced individually or in any combination.
Abstract translation: 提供了从移动平台改进的气体泄漏检测。 可以进行自动水平空间尺度分析，以区分泄漏与被测气体的背景水平。 可以通过使用两个或更多个同位素比率和/或化学示踪剂的示踪剂测量来提供源识别，以区分气体泄漏与测量气体的其他来源。 多点测量结合多点测量结果的空间分析可以提供泄漏源距离估计。 提供定性来源识别。 这些方法可以单独或以任何组合实施。
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公开(公告)号：US09267880B1
公开(公告)日：2016-02-23
申请号：US14634682
申请日：2015-02-27
Applicant: Picarro, Inc.
Inventor： Sze Meng Tan , John A. Hoffnagle , Chris W. Rella
CPC classification number: G01N21/39 , G01J3/00 , G01J3/42 , G01J3/427 , G01N2021/399
Abstract: For cavity enhanced optical spectroscopy, the cavity modes are used as a frequency reference. Data analysis methods are employed that assume the data points are at equally spaced frequencies. Parameters of interest such as line width, integrated absorption etc. can be determined from such data without knowledge of the frequencies of any of the data points. Methods for determining the FSR index of each ring-down event are also provided.
Abstract translation: 对于腔增强光谱，腔模式用作频率参考。 采用数据分析方法，假设数据点处于等间隔的频率。 可以从这样的数据中确定诸如线宽，积分吸收等的关注参数，而不知道任何数据点的频率。 还提供了确定每个减号事件的FSR指数的方法。
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8.发明申请Methods for gas leak detection and localization in populated areas using horizontal analysis 有权采用横向分析方法对人口稠密地区进行气体泄漏检测和定位公开(公告)号：US20140032160A1
公开(公告)日：2014-01-30
申请号：US13656080
申请日：2012-10-19
Applicant: Picarro, Inc.
Inventor： Chris W. Rella , Eric R. Crosson , Michael Woelk , Sze Meng Tan
IPC: G06F15/00
CPC classification number: G01M3/20 , G01N21/3504 , G01N33/0004 , G01N2201/025
Abstract: Improved gas leak detection from moving platforms is provided. Automatic horizontal spatial scale analysis can be performed in order to distinguish a leak from background levels of the measured gas. Source identification can be provided by using isotopic ratios and/or chemical tracers to distinguish gas leaks from other sources of the measured gas. Multi-point measurements combined with spatial analysis of the multi-point measurement results can provide leak source distance estimates. These methods can be practiced individually or in any combination.
Abstract translation: 提供了从移动平台改进的气体泄漏检测。 可以进行自动水平空间尺度分析，以区分泄漏与被测气体的背景水平。 可以通过使用同位素比率和/或化学示踪剂来提供源识别，以区分气体泄漏与测量气体的其他来源。 多点测量结合多点测量结果的空间分析可以提供泄漏源距离估计。 这些方法可以单独或以任何组合实施。
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公开(公告)号：US20250027918A1
公开(公告)日：2025-01-23
申请号：US18225017
申请日：2023-07-21
Applicant: Picarro, Inc.
Inventor： Bruce A. Richman , James M. Hamilton , Chris W. Rella , Elizabeth R. Schemm , Kal M. Skog , Rebecca Wernis
Abstract: Improved gas sample preprocessing is provided for scanning optical spectroscopic analysis instruments by tailoring characteristic gas handling times to the scan time Ts of the analysis instrument. In particular, for sample preconcentration, the desorption duration Td of the sample preconcentrator should be ≥2Ts. For gas chromatography, the elution duration Te of relevant eluted species should be ≥2Ts. This advantageously avoids having significant changes in the gas sample within the analysis instrument as a scan is being performed.
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公开(公告)号：US11933774B1
公开(公告)日：2024-03-19
申请号：US18060111
申请日：2022-11-30
Applicant: Picarro Inc.
Inventor： Sean MacMullin , Chris W. Rella , Aaron Van Pelt , Alex Balkanski , Yonggang He , Sze M. Tan , David Steele , Tim Clark
CPC classification number: G01N33/0075 , G01M3/04 , G01N33/0047
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 source. 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.
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