Medium frequency mine communication system
    1.
    发明授权
    Medium frequency mine communication system 失效
    中频矿山通信系统

    公开(公告)号:US4879755A

    公开(公告)日:1989-11-07

    申请号:US56559

    申请日:1987-05-29

    IPC分类号: H04B5/00

    摘要: A method for using an underground mine communication system to effect minewide communication and an intrinsically safe current limiter circuit for insuring that electrical equipment in the system will not cause incendiary conditions. The underground mine communication system comprises a plurality of repeaters and medium frequency radios, including, mobile, portable and personal-carried radios, inductively coupled to electrical conductors and natural waveguides existing in the earth by tuned loop antennas. Messages transmitted by the radios are carried to the repeaters by the conductors or coal seam waves. The repeaters amplify, replicate and retransmit the message at two different frequencies for transmission of the message to a surface base station and to other radios in the system. A paging system, which has a separate set of repeaters, is also coupled to the network of electrical conductors and natural waveguides by tuned loop antennas. The paging system alerts miners to contact the surface base station. Radios, pagers and repeaters in the system are equipped with the intrinsically safe current limiter circuit to preclude the development of incendiary conditions. The current limiter circuit comprises a series arrangement of a current trip circuit, a redundant current trip circuit and a current limiting field effect transistor controlled by a feedback control amplifier.

    Facility and method for the detection and monitoring of plumes below a
waste containment site with radiowave tomography scattering methods
    2.
    发明授权
    Facility and method for the detection and monitoring of plumes below a waste containment site with radiowave tomography scattering methods 失效
    用放射线层析成像散射法检测和监测废物遏制场所下面的羽毛的设施和方法

    公开(公告)号:US5408182A

    公开(公告)日:1995-04-18

    申请号:US975776

    申请日:1992-11-13

    CPC分类号: G01V3/30 G01V3/34

    摘要: An embodiment of the present invention is a toxic waste containment facility subject to leaking hazardous plumes into soils beneath and adjacent to the site. The facility includes a plurality of substantially horizontal underground drillholes adjacent to and below a waste containment pit. A radio transmitter and antenna are placed in a first underground drillhole proximate to a surface waste containment site. A radio receiver and antenna are placed in a second underground drillhole opposite to the first drillhole. A position indicator is used for gauging a plurality of locations of the radio transmitter and antenna within the first underground drillhole and the radio receiver and antenna within the second underground drillhole. A data processing unit analyzes data received from radio receiver and antenna and position indicator to measure radio signal attenuation between the radio transmitter and antenna and radio receiver and antenna. The transmitted signal from the radio transmitter and antenna are synchronized by a signal from the data processing unit. Fiber optic cables are used to couple signals between the radio transmitter and antenna and radio receiver and antenna with the data processing unit. Along each path, the operating frequency is increased until all of the transmitted energy is absorbed along the path to maximize resolution. Tomographic techniques are used to translate the data collected from a variety of transmitter and receiver positions into attenuation profiles that can image a toxic plume beneath the containment pit.

    摘要翻译: 本发明的一个实施例是一种有毒废物遏制设施,将危险羽流泄漏到场地下面和附近的土壤中。 该设施包括在废物容纳坑附近和下方的多个大致水平的地下钻孔。 无线电发射器和天线放置在靠近表面废物容纳场所的第一个地下钻孔中。 无线电接收器和天线放置在与第一钻孔相对的第二地下钻孔中。 位置指示器用于测量第一地下钻孔内的无线电发射机和天线的多个位置以及第二地下钻孔内的无线电接收机和天线。 数据处理单元分析从无线电接收机和天线和位置指示器接收的数据,以测量无线电发射机和天线之间的无线电信号衰减以及无线电接收机和天线。 来自无线电发射机和天线的发射信号通过来自数据处理单元的信号同步。 光纤电缆用于将无线电发射机和天线之间的信号与无线电接收机和天线耦合到数据处理单元。 沿着每个路径,工作频率增加,直到所有的发射能量沿着路径被吸收以最大化分辨率。 使用层析技术将从各种发射器和接收器位置收集的数据转换成可以在容纳坑下方形成有毒羽流的衰减曲线。

    Current limiter circuit
    3.
    发明授权
    Current limiter circuit 失效
    限流电路

    公开(公告)号:US5301082A

    公开(公告)日:1994-04-05

    申请号:US792036

    申请日:1991-11-13

    IPC分类号: H04B5/00 H02H9/00 H02H5/04

    摘要: A method for using an underground mine communication system to effect minewide communication and an intrinsically safe current limiter circuit for insuring that electrical equipment in the system will not cause incendiary conditions. The underground mine communication system comprises a plurality of repeaters and medium frequency radios, including mobile, portable and personal-carried radios, coupled to electrical conductors and natural waveguides existing in the earth by tuned loop antennas. Messages transmitted by the radios are carried to the repeaters by the conductors or coal seam waves. The repeaters amplify, replicate and retransmit the message at two different frequencies for transmission of the message to a surface base station and to other radios in the system. A paging system, which has a separate set of repeaters, is also coupled to the network of electrical conductors and natural waveguides by tuned loop antennas. The paging system alerts miners to contact the surface base station. Radios, pagers and repeaters in the system are equipped with the intrinsically safe current limiter circuit to preclude the development of incendiary conditions. The current limiter circuit comprises a series arrangement of a current trip circuit, a redundant current trip circuit and a current limiting field effect transistor controlled by a feedback control amplifier.

    摘要翻译: 一种使用地下矿井通信系统来实现微型通信的方法和一种本质安全限流器电路,用于确保系统中的电气设备不会引起燃烧状况。 地下矿井通信系统包括多个中继器和中频无线电,包括通过调谐环路天线耦合到电导体和存在于地球中的天线波导的移动便携式和个人携带无线电。 由无线电发送的消息由导体或煤层波传送到中继器。 中继器以两个不同的频率对消息进行放大,复制和重传,以将消息传输到表面基站和系统中的其他无线电。 具有单独的一组中继器的寻呼系统还通过调谐环路天线耦合到电导体网络和天线波导。 寻呼系统提醒矿工接触地面基站。 系统中的无线电,寻呼机和中继器配有本质安全限流器电路,以排除燃烧条件的发展。 电流限制器电路包括电流跳闸电路,冗余电流跳闸电路和由反馈控制放大器控制的限流场效应晶体管的串联布置。

    Medium frequency mine communication system
    4.
    发明授权
    Medium frequency mine communication system 失效
    中频通信系统

    公开(公告)号:US5093929A

    公开(公告)日:1992-03-03

    申请号:US686874

    申请日:1991-04-16

    IPC分类号: H04B5/00

    摘要: A method for using an underground mine communication system to effect minewide communication and an intrinsically safe current limiter circuit for insuring that electrical equipment in the system will not cause incendiary conditions. The underground mine communication system comprises a plurality of repeaters and medium frequency radios, including mobile, portable and personal-carried radios, coupled to electrical conductors and natural waveguides existing in the earth by tuned loop antennas. Messages transmitted by the radios are carried to the repeaters by the conductors or coal seam waves. The repeaters amplify, replicate and retransmit the message at two different frequencies for transmission of the message to a surface base station and to other radios in the system. A paging system, which has a separate set of repeaters, is also coupled to the network of electrical conductors and natural waveguides by tuned loop antennas. The paging system alerts miners to contact the surface base station. Radios, pagers and repeaters in the system are equipped with the intrinsically safe current limiter circuit to preclude the development of incendiary conditions. The current limiter circuit comprises a series arrangement of a current trip circuit, a redundant current trip circuit and a current limiting field effect transistor controlled by a feedback control amplifier.

    摘要翻译: 一种使用地下矿井通信系统来实现微型通信的方法和一种本质安全限流器电路,用于确保系统中的电气设备不会引起燃烧状况。 地下矿井通信系统包括多个中继器和中频无线电,包括通过调谐环路天线耦合到电导体和存在于地球中的天线波导的移动便携式和个人携带无线电。 由无线电发送的消息由导体或煤层波传送到中继器。 中继器以两个不同的频率对消息进行放大,复制和重传,以将消息传输到表面基站和系统中的其他无线电。 具有单独的一组中继器的寻呼系统还通过调谐环路天线耦合到电导体网络和天线波导。 寻呼系统提醒矿工接触地面基站。 系统中的无线电,寻呼机和中继器配有本质安全限流器电路,以排除燃烧条件的发展。 电流限制器电路包括电流跳闸电路,冗余电流跳闸电路和由反馈控制放大器控制的限流场效应晶体管的串联布置。