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1. 发明授权

US10585069B2 Detection, monitoring, and determination of location of changes in metallic structures using multimode acoustic signals 有权
公开(公告)号：US10585069B2
公开(公告)日：2020-03-10
申请号：US15964967
申请日：2018-04-27
申请人： Chevron U.S.A. Inc. , TRIAD NATIONAL SECURITY, LLC
发明人： Alp T. Findikoglu , Dipen N. Sinha , Daniel R. Chapman
IPC分类号： G01N29/44 , G01N29/34 , G01N29/46 , G01N29/04 , G01N29/07 , G01N29/42
摘要： Methods for detection, monitoring, and determination of location of changes in rigid structures with arbitrarily complex geometries are described. Implementations include locating acoustic transducers that generate and receive acoustic signals at multiple locations along a surface of the rigid structure, wherein longitudinal spacing between the transducer locations define measurement zones. Acoustic signals with chosen amplitude-time-frequency characteristics excite multiple vibration modes in the structure within each zone. Small mechanical changes in the inspection zones lead to scattering and attenuation of broadband acoustic signals, which are detectable as changes in received signal characteristics as part of a through-transmission technique. Additional use of short, narrowband pulse acoustic signals as part of a pulse-echo technique allows determination of the relative location of the mechanical change within each zone based on the differential delay profiles.

2. 发明授权

US10697938B2 Fluid characterization using acoustics 有权
公开(公告)号：US10697938B2
公开(公告)日：2020-06-30
申请号：US16494663
申请日：2018-03-15
申请人： TRIAD NATIONAL SECURITY, LLC , Chevron U.S.A. Inc.
发明人： Alessandro Cattaneo , Dipen N. Sinha , Todd Andrew Jankowski , James Schrodt
IPC分类号： G01N29/02 , G01N29/22 , G01N29/24 , G01N29/28 , G01N29/44 , G01N29/32
摘要： A measurement system and a method for determining steam quality (i.e. vapor mass fraction) measurements of multiphase fluid flowing through pipes are described. An acoustic sensor device consists of an acoustic transmitter and an acoustic receiver that are designed to be attached to a pipe. The acoustic transmitter and the acoustic receiver are exposed to an interior space of the pipe through openings in a wall of the pipe. Acoustic waves generated by the transmitter and captured by the receiver traverse the multiphase fluid flowing into the pipe. Swept-frequency acoustic interferometry (SFAI) technique is used to measure ultrasonic acoustic properties of a fluid. Machine-learning techniques based on principal component analysis, support vector machine regression and support vector machine classification are used for determining steam quality.

3. 发明授权

US10473625B2 Detection and monitoring of changes in metallic structures using multimode acoustic signals 有权
公开(公告)号：US10473625B2
公开(公告)日：2019-11-12
申请号：US15751429
申请日：2016-08-12
申请人： Triad National Security, LLC , Chevron U.S.A. Inc.
发明人： Alp T. Findikoglu , Dipen N. Sinha , Daniel R. Chapman
IPC分类号： G01N29/04 , G01F1/66 , G01F1/708 , G01F1/74 , G01N29/32 , G01N29/34 , G01N29/44 , G01N29/46 , G01N29/07
摘要： Methods for detecting and monitoring changes in mechanical structures and in walls of pipes, vessels and storage tanks, using muitimode acoustic signal propagation and detection, are described. Acoustic signals having chosen amplitude-time-frequency characteristics excite multiple modes in the structure under investigation, are generated and received at a small number of accessible locations, such as the ends of pipes and the tops and bottoms of vessels and storage tanks, with the inspection region between transmit and receive transducers. Small mechanical changes lead to acoustic scattering and attenuation among the various modes, which are detectable as changes in received signal intensity. Such changes may include material loss, material conversion and material addition. Once the structure is characterized in a known condition, the present method may be used to monitor the structure at a later time to determine whether changes have taken place. Methods for effective temperature compensation are also described. In addition, various pipe geometries and complex pipe geometries involving elbows, flanges, and the like can be monitored.

4. 发明申请

US20190242851A1 NONINVASIVE ACOUSTICAL PROPERTY MEASUREMENT OF FLUIDS 审中-公开
公开(公告)号：US20190242851A1
公开(公告)日：2019-08-08
申请号：US16318862
申请日：2017-07-20
申请人： TRIAD NATIONAL SECURITY, LLC
发明人： Dipen N. Sinha , Cristian Pantea , Blake T. Sturtevant , Anirban Chaudhuri
IPC分类号： G01N29/024 , G01N29/22
CPC分类号： G01N29/024 , G01H11/06 , G01N29/223 , G01N2291/043
摘要： Methods for noninvasive determination of acoustical properties of flowing in pipes having a large ratio (>10) of pipe diameter to wall thickness, and in highly attenuating fluids are described. When vibrations are excited on the outer surface of the wall of a pipe, the resulting vibrations propagate directly through the wall In a normal direction and through the pipe wall as guided waves, appearing on the opposite side of the pipe. This dual path propagation through pipes, where guided waves take the circumferential path in the wall of the pipe and may interfere with the time of-flight measurement obtained from the direct path through the fluid, is at least In part resolved by subtracting the signal from the guided wave from the combined signal, thereby permitting improved observation of the direct path propagation through the fluid.

5. 发明授权

US11879868B2 Acoustics-based noninvasive wafer defect detection 有权
公开(公告)号：US11879868B2
公开(公告)日：2024-01-23
申请号：US17321332
申请日：2021-05-14
申请人： Triad National Security, LLC
发明人： Cristian Pantea , John James Greenhall , Alan Lyman Graham , Dipen N. Sinha
IPC分类号： G01N29/12 , G01N29/24 , G01N29/07 , G01N29/22 , G01N29/27 , G06N20/00 , G01N29/46
CPC分类号： G01N29/12 , G01N29/07 , G01N29/225 , G01N29/2418 , G01N29/2437 , G01N29/27 , G01N29/46 , G06N20/00 , G01N2291/011 , G01N2291/023 , G01N2291/0289 , G01N2291/101
摘要： Techniques are provided for detecting wafer defects. Example techniques include exciting a wafer using an acoustic signal to cause the wafer to exhibit vibrations, measuring one or more of linear frequency response metrics or nonlinear frequency responses metrics associated with the vibrations, and identifying any defects in the wafer based at least in part on one or more of the linear frequency response metrics or nonlinear frequency responses metrics. In embodiments, the wafer includes bismuth telluride (Bi2Te3).

6. 发明申请

US20210356435A1 ACOUSTICS-BASED NONINVASIVE WAFER DEFECT DETECTION 有权
公开(公告)号：US20210356435A1
公开(公告)日：2021-11-18
申请号：US17321332
申请日：2021-05-14
申请人： Triad National Security, LLC
发明人： Cristian Pantea , John James Greenhall , Alan Lyman Graham , Dipen N. Sinha
IPC分类号： G01N29/12 , G01N29/24 , G01N29/07 , G01N29/22 , G01N29/27 , G01N29/46 , G06N20/00
摘要： Techniques are provided for detecting wafer defects. Example techniques include exciting a wafer using an acoustic signal to cause the wafer to exhibit vibrations, measuring one or more of linear frequency response metrics or nonlinear frequency responses metrics associated with the vibrations, and identifying any defects in the wafer based at least in part on one or more of the linear frequency response metrics or nonlinear frequency responses metrics. In embodiments, the wafer includes bismuth telluride (Bi2Te3).

7. 发明授权

US10830735B2 Simultaneous real-time measurement of composition, flow, attenuation, density, and pipe-wallthickness in multiphase fluids 有权
公开(公告)号：US10830735B2
公开(公告)日：2020-11-10
申请号：US16495612
申请日：2018-03-20
申请人： Triad National Security, LLC
发明人： Dipen N. Sinha , Anirban Chaudhuri
IPC分类号： G01N29/024 , G01F1/66 , G01P5/18 , G01P5/24
摘要： Apparatus (10) and methods for making simultaneous measurements of composition (water-cut), fluid flow, and sound attenuation in a multiphase fluid flowing (15) through a pipe (12) in real-time, using the same apparatus (10) are described. Additionally, the apparatus (10) provides real-time pipe wall thickness monitoring for observing pipe corrosion or internal deposition. Knowledge of wall thickness is necessary to correct for water-cut (oil-water composition) automatically by adjusting the liquid path length internal to the pipe (spool). The use of short duration frequency chirp excitation signals (24) enables the apparatus to provide information that can be used to extract multiple levels of information from the same measurement in multiphase fluids including the presence of a significant quantity of gas (˜60% gas volume fraction) in different flow regimes. Besides measuring steady flow, this device is useful for measurements during fast changing flows, such as for a rod-pumped well. Measurements up to about 1000 times a second can reliably be made.

8. 发明授权

US10908131B2 Acoustic gas volume fraction measurement in a multiphase flowing liquid 有权
$Acoustic gas volume fraction measurement in a multiphase flowing liquid$
公开(公告)号：US10908131B2
公开(公告)日：2021-02-02
申请号：US15563606
申请日：2016-04-04
申请人： Triad National Security, LLC
发明人： Dipen N. Sinha , Anirban Chaudhuri , Cristian Pantea
IPC分类号： G01N29/34 , G01N29/036 , H04R1/42
摘要： Apparatus and methods for the measurement of gas volume fraction of produced oil are described. A first method measures the response of a pipe containing the produced oil excited by a source of vibration in the form of an acoustic frequency chirp containing a linearly varying range of frequencies in the tens of kilohertz range encompassing at least one resonant mode of the pipe. As the gas volume fraction increases, the location of the peak maximum of the measured frequency spectrum responsive to the excitation increases in frequency, and the height of the peak maximum increases, thereby permitting a linear calibration curve to be obtained. A second method measures the response of a pipe containing the produced oil to excitation by a continuous source of vibration having a chosen frequency above those which excite flexural vibrations in the pipe and simultaneously excite acoustic waves in the fluid contained in the pipe, known as the coincidence frequency. Gas present in the fluid will interrupt sound propagation or reverberation, thereby generating fluctuations in the amplitude of the measured vibrations of the pipe. The amplitude fluctuation level provides a measure of the gas volume present inside the pipe. A third method measures the response of a pipe containing the produced oil to excitation by a high-bandwidth, short pulse having a chosen center frequency above the coincidence frequency. Gas present in the fluid will interrupt pulse propagation, thereby generating fluctuations in the amplitude of the measured vibrations of the pipe.

9. 发明授权

US11293279B1 Multi-frequency electrical impedance tomography 有权
公开(公告)号：US11293279B1
公开(公告)日：2022-04-05
申请号：US16419350
申请日：2019-05-22
申请人： Triad National Security, LLC
发明人： Satish Karra , Hari S. Viswanathan , Maruti Kumar Mudunuru , Vamshi Krishna Chillara , Dipen N. Sinha
IPC分类号： E21B49/00 , E21B43/26 , G01V3/24 , E21B47/113 , G01F1/60
摘要： Apparatus includes a plurality of geological subsurface electrical line sensors spaced apart from each other proximate a predetermined geological subsurface region of interest, with at least one of the electrical line sensors situated as a line source to produce a multi-frequency electrical impedance tomography source signal, and with at least one of the electrical line sensors situated as a line detector to receive the multi-frequency electrical impedance tomography response signal associated with the source signal that propagates through the predetermined geological subsurface region of interest, and a controller including a processor and a memory configured with instructions that, when executed by the processor, cause the processor to determine an electrical mapping over the predetermined geological subsurface region of interest based on the multi-frequency electrical impedance tomography source signal, response signal, and the spatial positions of the geological subsurface electrical line sensors.

10. 发明授权

US11567038B2 Apparatus and method for shaped waveform interrogation 有权
公开(公告)号：US11567038B2
公开(公告)日：2023-01-31
申请号：US17035483
申请日：2020-09-28
申请人： TRIAD NATIONAL SECURITY, LLC
发明人： Dipen N. Sinha , Cristian Pantea
IPC分类号： G01N29/34 , G01F1/667 , G01N29/30 , G01N29/02 , G01N9/24
摘要： Described are an apparatus, computer program product, and associated methods for shaped waveform acoustic interrogation of substances and materials to determine one or more properties of the materials or substances. In some embodiments, a shaped waveform is formed by summing two or more different waveforms and an acoustic wave is generated according to the shaped waveform. The acoustic wave is transmitted by one or more transmitting transducers through the substance or material and received by one or more receiving transducers. The shaped waveform acoustic wave can have a duration or a period that is less than about 20 μs and can comprise predetermined frequency content. Characteristics of the shaped waveform acoustic wave, as received at the receiving transducer(s), including characteristics such as amplitude, frequency, time of flight, etc., can be associated with said one or more properties of the substance or material to provide for real-time monitoring of these properties.

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