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51.发明申请Method and system of using odd harmonics for phase generated carrier homodyne 有权使用奇次谐波的相位产生载波零差的方法和系统公开(公告)号：US20070103692A1
公开(公告)日：2007-05-10
申请号：US11270058
申请日：2005-11-09
Applicant: David Hall , Paul Greene
Inventor： David Hall , Paul Greene
IPC: G01B9/02
CPC classification number: G01V1/22 , G01B9/02083 , G01B9/021 , G01D5/35303 , G01H9/004 , G01V1/226
Abstract: A method and system for providing fast interrogation of a signal received from a fiber optic sensor array using a low drive voltage, by modulating the array signal with a phase generated carrier optical signal having an odd harmonic modulation frequency, sending it to an interferometric system, and demodulating the array signal using a demodulation algorithm that is independent of the phase offset. A detector using direct detection method can be used to determine the signal's phase information. The odd harmonic modulation method allows the selection of a desirable odd harmonic PGC frequency with low drive voltage while providing similar performance of the usual PGC frequency that requires a higher drive voltage.
Abstract translation: 一种用于使用低驱动电压从光纤传感器阵列接收的信号快速询问的方法和系统，通过用具有奇次谐波调制频率的相位产生的载波光信号调制阵列信号，将其发送到干涉系统， 以及使用独立于相位偏移的解调算法解调阵列信号。 使用直接检测方法的检测器可用于确定信号的相位信息。 奇次谐波调制方法允许选择具有低驱动电压的期望的奇次谐波PGC频率，同时提供需要较高驱动电压的通常PGC频率的类似性能。
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公开(公告)号：US5001337A
公开(公告)日：1991-03-19
申请号：US506741
申请日：1990-04-10
Applicant: Emil F. Homuth
Inventor： Emil F. Homuth
Abstract: A fiber optic geophysical sensor in which laser light is passed through a sensor interferometer in contact with a geophysical event, and a reference interferometer not in contact with the geophysical event but in the same general environment as the sensor interferometer. In one embodiment, a single tunable laser provides the laser light. In another embodiment, separate tunable lasers are used for the sensor and reference interferometers. The invention can find such uses as monitoring for earthquakes, and the weighing of objects.
Abstract translation: 一种光纤地球物理传感器，其中激光通过与地球物理事件接触的传感器干涉仪，以及与地球物理事件不接触但与传感器干涉仪相同的一般环境中的参考干涉仪。 在一个实施例中，单个可调激光器提供激光。 在另一个实施例中，单独的可调激光器用于传感器和参考干涉仪。 本发明可以发现地震监测和物体称重等用途。
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公开(公告)号：US20240310538A1
公开(公告)日：2024-09-19
申请号：US18183671
申请日：2023-03-14
Applicant: Astro Technology Group, LLC
Inventor： David Verl Brower
Abstract: Disclosed herein are systems and methods configured to produce and monitor signals that characterize activities corresponding to intruders (e.g., persons and/or animals) traversing a boundary that at least partially defines a designated area. Such activities can characterize one or more persons traversing a boundary or attempting to traverse a barrier that defines the boundary. Sensors within a substrate that extends along the boundary can be used for producing such signals. The substrate can be soil of which ground at the boundary is comprised, a manmade material located within such soil or a material from which a barrier along the boundary is constructed. The sensors can be fiber optic sensors that extend contiguously along a length of the boundary and/or can be fiber optic sensors that are located at discrete locations along the length of the boundary. The signals can cause one or more responsive actions to be implemented.
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54.发明公开公开(公告)号：US20240241275A1
公开(公告)日：2024-07-18
申请号：US18414419
申请日：2024-01-16
Applicant: NEC Laboratories America, Inc.
Inventor： Shaobo HAN , Yuheng CHEN , Ming-Fang HUANG , Tingfeng LI
CPC classification number: G01V1/288 , G01V1/001 , G01V1/226 , G08G1/0104
Abstract: Disclosed are machine learning (ML) based Distributed Fiber Optic Sensing (DFOS) systems, methods, and structures for Sonic Alert Pattern (SNAP) event detection performed in real time including an intelligent SNAP informatic system in conjunction with DFOS/Distributed Acoustic Sensing (DAS) and machine learning technologies that utilize SNAP vibration signals as an indicator. Without installation of additional sensors, vibration signals indicative of SNAP events are detected along a length of an existing optical fiber through DAS. Raw DFOS data is utilized—and not DFOS waterfall data—resulting in faster and more accurate information derivation as rich, time-frequency information in the raw DFOS/DAS waveform data is preserved. A deep learning module Temporal Relation Network (TRN) that accurately detects SNAP events from among chaotic signals of normal traffic is employed, making it reliable when applied to busy roads with dense traffic and vehicles of different speed.
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公开(公告)号：US20240201415A1
公开(公告)日：2024-06-20
申请号：US18287216
申请日：2022-06-30
Inventor： Yanpeng LI , Congwei LIU , Yanbin ZHANG
Abstract: Disclosed are an improved method and device for calibrating the depth of an optical fibre in a well. The method includes acquiring borehole seismic wave field data based on an optical fibre acoustic wave sensor; determining first arrival time information based on the borehole seismic wave field data; determining a downgoing wave first arrival amplitude based on the first arrival time information and the borehole seismic wave field data; determining an optical fibre amplitude feature point based on the downgoing wave first arrival amplitude; determining a wellhead initial position and a receiving point spacing of the optical fibre in the well based on the optical fibre amplitude feature point and logging curve feature points; and determining depth calibration information of the optical fibre in the well based on the wellhead initial position and the receiving point spacing.
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Patent Agency Ranking
公开(公告)号：US20240184006A1
公开(公告)日：2024-06-06
申请号：US18065192
申请日：2022-12-13
Applicant: Hifi Engineering Inc.
Inventor： Seyed Ehsan JALILIAN , Yuhong LIU
Abstract: Methods, systems, and techniques for wind detection. A first acoustic signal generated by an acoustic sensor positioned to be actuated in response to wind is measured. An average value of the first acoustic signal over a sampling duration is determined. The average value may be a median, and the sampling duration may be at least 15 minutes. If the average value of the first acoustic signal satisfies a wind detection threshold, the first acoustic signal is determined to be generated by the wind.
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57.发明公开公开(公告)号：US20240142647A1
公开(公告)日：2024-05-02
申请号：US18280196
申请日：2021-03-05
Applicant: NEC Corporation
Inventor： Yutaka Yano
Abstract: An environment information acquisition apparatus (400) according to the present disclosure includes an information acquisition unit (410) configured to receive, from an optical fiber (500), an optical signal including a pattern in accordance with environment information applied to the optical fiber (500) and acquire the environment information based on the optical signal; an information provision unit (430) configured to output measurement data representing the environment information to outside; and a detection unit (420) configured to detect vibration or sound applied to the information acquisition unit (410).
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公开(公告)号：US20240134076A1
公开(公告)日：2024-04-25
申请号：US18390981
申请日：2023-12-20
Applicant: EXFO Inc.
Inventor： Hongxin CHEN , Normand CYR
Abstract: There is provided a method and an apparatus of fiber optic distributed acoustic sensing (DAS) which use a simple, reliable and robust signal processing for amplitude-based DAS measurements. 1) The lack of linearity of the amplitude-based DAS measurements (due to its unpredictable variation of the transfer function along the fiber) can be improved by normalizing the amplitude vs distance using an amplitude-normalization trace obtained from either a) coherent laser OTDR measurements with laser frequency dithering or b) computing a normalization trace from the coherent OTDR/DAS traces and the un-coherent OTDR/DAS traces. 2) Instrument offset (e.g., due to low vertical sampling resolution) may further be corrected using un-coherent OTDR/DAS traces to extract an instrument system offset.
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公开(公告)号：US11940583B2
公开(公告)日：2024-03-26
申请号：US17534630
申请日：2021-11-24
Applicant: Halliburton Energy Services, Inc.
Inventor： Xiang Wu , Mark Elliott Willis , David Andrew Barfoot
CPC classification number: G01V1/42 , E21B47/135 , G01H9/004 , G01V1/201 , G01V1/226 , G01V1/48 , G01V1/52 , G01V2210/121 , G01V2210/1234 , G01V2210/1429 , G01V2210/161 , G01V2210/324
Abstract: Various embodiments include apparatus and methods implemented to take into consideration gauge length in optical measurements. In an embodiment, systems and methods are implemented to interrogate an optical fiber disposed in a wellbore, where the optical fiber is subjected to seismic waves, and to generate a seismic wavefield free of gauge length effect and/or to generate a prediction of a seismic wavefield of arbitrary gauge length, based on attenuation factors of a plurality of wavefields acquired from interrogating the optical fiber. In an embodiment, systems and methods are implemented to interrogate an optical fiber disposed in a wellbore, where the optical fiber is subjected to seismic waves, and to convert a seismic wavefield associated with a first gauge length to a seismic wavefield associated with a different gauge length that is a multiple of the first gauge length. Additional apparatus, systems, and methods are disclosed.
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公开(公告)号：US20240061137A1
公开(公告)日：2024-02-22
申请号：US17890359
申请日：2022-08-18
Applicant: Network Integrity Systems, Inc.
Inventor： Cary R. Murphy , Daniel M. Goertzen , Mark K. Bridges
Abstract: A method is provided for analyzing a monitoring signal from a sensing system to determine an alarm condition, where the monitoring signal is provided as a stream of digital values which are analyzed using a frequency-based transform to generate a set of transform coefficients which are compared to a set of envelope coefficients. The sensitivity of the analysis is automatically controlled to accommodate environmental noise on the fiber by increasing the envelope coefficients to make the analysis less sensitive at each cycle by adopting the larger value from the comparison and by decaying the envelope coefficients at each cycle over time to a smaller value down to a floor value.
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