OPTICAL FIBER SENSING FOR HIGHWAY MAINTENANCE

    公开(公告)号:US20200003588A1

    公开(公告)日:2020-01-02

    申请号:US16454053

    申请日:2019-06-27

    Abstract: Aspects of the present disclosure describe systems, methods and structures employing optical fiber sensing to monitor highway/roadway/street conditions (i.e., potholes, pavement cracks, etc.) in real-time, continuously, and while the highway/roadway/street remains in operation (in-service monitoring). Systems, methods, and structures according to aspects of the present disclosure may employ machine learning (ML) algorithms including neural networks to provide and or report on highway conditions so monitored/sensed. Of further advantage, systems, methods, and structures for optical fiber sensing for highway maintenance may operate in real-time, continuously, long-term, in-service, and may employ existing telecommunications optical cables without additional deployment cost(s) or disruption of telecommunications traffic.

    ULTRA-HIGH SPEED OPTICAL TRANSPORT EMPLOYING LDPC-CODED MODULATION WITH NON-UNIFORM SIGNALING
    63.
    发明申请
    ULTRA-HIGH SPEED OPTICAL TRANSPORT EMPLOYING LDPC-CODED MODULATION WITH NON-UNIFORM SIGNALING 有权
    超高速光学运输采用非均匀信号的LDPC编码调制

    公开(公告)号:US20160315704A1

    公开(公告)日:2016-10-27

    申请号:US15138184

    申请日:2016-04-25

    Abstract: A low-density parity-check (LDPC) coded bit-interleaved coded modulation with iterative decoding (BICM-ID) scheme with nonuniform signaling which is effected by mapping simple variable-length prefix codes onto the constellation. By employing Huffman procedure(s), prefix codes can be designed to approach optimal performance. Experimental evaluations of the schemes demonstrate that the nonuniform scheme performs better than 8-QAM by at least 8.8 dB.

    Abstract translation: 具有不均匀信令的迭代解码(BICM-ID)方案的低密度奇偶校验(LDPC)编码比特交织编码调制,其通过将简单的可变长度前缀码映射到星座上来实现。 通过采用霍夫曼程序,可以设计前缀码来达到最佳性能。 这些方案的实验评估表明,不均匀方案比8-QAM优于至少8.8dB。

    RATE ADAPTIVE IRREGULAR QC-LDPC CODES FROM PAIRWISE BALANCED DESIGNS FOR ULTRA-HIGH-SPEED OPTICAL TRANSPORTS
    64.
    发明申请
    RATE ADAPTIVE IRREGULAR QC-LDPC CODES FROM PAIRWISE BALANCED DESIGNS FOR ULTRA-HIGH-SPEED OPTICAL TRANSPORTS 有权
    用于超高速光学传输的配对平衡设计的速率自适应非线性QC-LDPC编码

    公开(公告)号:US20140208185A1

    公开(公告)日:2014-07-24

    申请号:US14162951

    申请日:2014-01-24

    Abstract: Systems and methods for data transport include encoding one or more streams of input data using one or more Quasi-Cyclic Low Density Parity Check (QC-LDPC) encoders; controlling irregularity of the QC-LDPC encoded data while preserving the quasi-cyclic nature of the LDPC encoded data and eliminating the error floor phenomenon. A parity-check matrix may be partially reconfigured to adapt one or more code rates; and one or more signals are generated using a mapper, wherein the output of the mapper is modulated onto a transmission medium. One or more streams of input data are received, and the streams are decoded using one or more QC-LDPC decoders.

    Abstract translation: 用于数据传输的系统和方法包括使用一个或多个准循环低密度奇偶校验(QC-LDPC)编码器来编码一个或多个输入数据流; 控制QC-LDPC编码数据的不规则性,同时保留LDPC编码数据的准循环性质并消除错误出现现象。 可以部分地重新配置奇偶校验矩阵以适应一个或多个码率; 并且使用映射器生成一个或多个信号,其中映射器的输出被调制到传输介质上。 接收一个或多个输入数据流,并且使用一个或多个QC-LDPC解码器解码流。

    FIBER COUPLED NETWORK OF SENSORS FOR NEAR-INFRARED SPECTROSCOPY BASED TISSUE OXYGENATION

    公开(公告)号:US20250127438A1

    公开(公告)日:2025-04-24

    申请号:US18901562

    申请日:2024-09-30

    Abstract: An improved near-infrared spectroscopy based handheld tissue oxygenation scanner and method in which the handheld tissue oxygenation scanner is a small device-like an optical mouse-employing a single transmitter-receiver pair, an optical switch, and a plurality of optical fibers that transmit light into tissue under examination and receive light after interacting with that tissue. The integration of a plurality of optical fibers wherein each individual one provides emission/reception of infrared radiation advantageously provides a higher density of tissue interrogation by the infrared radiation thereby providing faster operation and more information in a given time period. Additional features and advantages of our inventive system and method include computer control and the ability to connect to a variety of computing devices via BlueTooth and other communications techniques.

    RANGE AND CAPABILITY EXTENDING DEVICE FOR PERIMETER INTRUSION DETECTION

    公开(公告)号:US20240127681A1

    公开(公告)日:2024-04-18

    申请号:US18485211

    申请日:2023-10-11

    CPC classification number: G08B13/00 G01V1/001 G01V1/226

    Abstract: A solar powered, self-contained DFOS extender that includes a wide-angle camera and a microphone. The DFOS extender monitors the perimeter constantly or at predetermined time intervals both visually and acoustically. It analyses these signals and if an alarming event is detected (such as an animal, a human, a car, or a truck seen or heard), then the DFOS extender generates a coded vibration via its in-built acoustic modem. These coded vibrations are detected by the fiber and an event log is generated. Consequently, a trespasser or false alarms (animals) are detected before they are within detectable distance of the underground DFOS optical sensor fiber. Advantageously, our DFOS extender can be placed in critical locations along a border where an increased detection range is desired and may later be relocated/reinstalled at other locations as well.

    TIME SYNCHRONIZATION METHOD WITH TRUSTED BEACONS AND DISTRIBUTED FIBER SENSING

    公开(公告)号:US20230412266A1

    公开(公告)日:2023-12-21

    申请号:US18319457

    申请日:2023-05-17

    CPC classification number: H04B10/071 H04B11/00 H04B10/25756

    Abstract: A method for time synchronization using distributed fiber optic sensing (DFOS) that employs several trusted time beacons that are attached to the DFOS sensing fiber which in turn is connected to the DFOS interrogator. The beacons transmit their signal via two different mediums, (1) wirelessly to sensor nodes in the coverage area, and (2) through vibrations on fiber to the DFOS/DAS system located at a trusted area such as the central office. Wireless broadcast to nearby sensors includes a timestamp and beacon ID. All the sensors in the field use one of the beacons in their vicinity (the one with the strongest signal) as their time reference and send the data back with the corresponding beacon index.

    FLEXIBLE RAPID DEPLOYABLE PERIMETER MONITOR SYSTEM

    公开(公告)号:US20230358907A1

    公开(公告)日:2023-11-09

    申请号:US18311874

    申请日:2023-05-03

    CPC classification number: G01V1/226 G01V1/001 G01V1/168 G01V2210/1425

    Abstract: A flexible, rapid deployable perimeter monitoring system and method that employs distributed fiber optic sensing (DFOS) technologies and includes a deployment/operations field vehicle including an interrogator and analyzer/processor. The deployment/operations field vehicle is configured to field deploy a ruggedized fiber optic sensor cable in an arrangement that meets a specific application need, and subsequently interrogate/sense via DFOS any environmental conditions affecting the deployed fiber optic sensor cable. Such sensed conditions include mechanical vibration, acoustic, and temperature that may be advantageously sensed/evaluated/analyzed in the deployment/operations vehicle and subsequently communicated to a central location for further evaluation and/or coordination with other monitoring systems. Upon completion, the field vehicle and DFOS reconfigure a current location or redeployed to another location.

Patent Agency Ranking