Method Providing Increased Signal-To-Noise (SNR) for Coherent Distributed Acoustic Sensing

    公开(公告)号:US20220196461A1

    公开(公告)日:2022-06-23

    申请号:US17555924

    申请日:2021-12-20

    Abstract: An advance in the art is made according to aspects of the present disclosure directed to a DAS method that utilizes a differential phase to detect phase change(s) between two locations of a DAS sensing fiber to ascertain vibrational/acoustic activities/environment at intermediary fiber location(s) between the two locations. Additionally, systems, methods, and structures according to aspects of the present disclosure may employ a fiber coil comprising a segment of fiber wrapped in acoustic sensitive material (“acoustic signal collector”). The material responds to an environmental acoustic signal, which results in strain(s) applied to the fiber. Furthermore, rather than using a measured phase difference between the two ends of the fiber coil, systems, methods, and structures according to aspects of the present disclosure utilize all samples collected from one end of the fiber coil to the other end of the fiber coil (the left side of the coil to the right side of the coil)—which may be extended further. Every two samples covering a partial or an entire section of the fiber coil are used as a pair (a “differential pair”) to determine a phase difference and the results from all the pairs are averaged to form one output exhibiting a reduced noise level and more stable signal as compared to prior art methods.

    BIPOLAR CYCLIC CODING FOR BRILLOUIN OPTICAL TIME DOMAIN ANALYSIS

    公开(公告)号:US20210181059A1

    公开(公告)日:2021-06-17

    申请号:US17115651

    申请日:2020-12-08

    Abstract: Aspects of the present disclosure describe systems, methods and structures providing bipolar cyclic coding for Brillouin optical time domain analysis that may be employed—for example—to determine high accuracy temperature and/or strain measurements along an optical fiber. Systems, methods, and structures according to the present disclosure employ the bipolar cyclic coding technique that advantageously overcomes the problems that plague the prior art and provides extended sensing range resulting from superior signal-to-noise characteristics.

    NETWORKED SYSTEMS FOR MONITORING FIRE EXTINGUISHER OPERATIONAL READINESS

    公开(公告)号:US20170209726A1

    公开(公告)日:2017-07-27

    申请号:US15412431

    申请日:2017-01-23

    Abstract: Aspects of the present disclosure describe apparatus, methods and systems for monitoring the operational status of fire extinguishers through the utilization of optically sensed, color profile determinations of a pressure gauge positioned on the fire extinguisher as well as the utilization of vibrational, and location sensing devices. Advantageously, monitoring apparatus according to the present disclosure are networkable, and a number of their operational characteristics may be configured via the network and associated servers. Furthermore, monitoring apparatus according to the present disclosure may employ vibrational, acceleration, GPS, RFID, and ultrasonic sensors to detect movement, location, and obstructions. In sharp contrast to the prior art, apparatus, methods and systems according to the present disclosure operate with existing fire extinguishers and provide a convenient, cost effective, and highly functional upgrade path for deployed fire extinguishers.

    GENERATION OF POLARIZATION-ALTERNATED QPSK FORMAT
    20.
    发明申请
    GENERATION OF POLARIZATION-ALTERNATED QPSK FORMAT 有权
    极坐标QPSK格式的生成

    公开(公告)号:US20140178071A1

    公开(公告)日:2014-06-26

    申请号:US14046588

    申请日:2013-10-04

    CPC classification number: H04J14/06 H04B10/5561

    Abstract: Methods, structures and systems for generating different polarization multiplexed signals wherein the drivers of the modulators are generic while a software-controlled manager allows the carrying of any standard 10 G/40 G/100 G data while—at the same time—being adaptively adjustable according to specific link requirements and users' requests in both dispersion-managed and uncompensated links.

    Abstract translation: 用于产生不同偏振复用信号的方法,结构和系统,其中调制器的驱动器是通用的,而软件控制的管理器允许携带任何标准的10G / 40G / 100G数据,同时可自适应地调节 根据具体链路要求和用户在色散管理和无补偿链路中的请求。

Patent Agency Ranking