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    Buried service detection
    2.
    发明公开
    Buried service detection 审中-公开
    埋地服务检测

    公开(公告)号：EP3002614A1

    公开(公告)日：2016-04-06

    申请号：EP14187645.8

    申请日：2014-10-03

    申请人： Cable Detection Limited

    发明人： Branson, Simon

    IPC分类号： G01V3/15 ,  G01V3/06 ,  G01V3/08 ,  G01V3/10

    CPC分类号： G01V3/10 ,  G01V3/06 ,  G01V3/081 ,  G01V3/104 ,  G01V3/15 ,  G01V13/00

    摘要： The invention relates to a mobile detection device (1) for an evaluation of a distance value from the device to an occluded ac-current carrying structure according to its emanated magnetic field, like a location of underground services. The device comprises multiple detection coils (2a,2b) arranged with a spacing (3) with respect to one another and an electronic signal evaluation unit for detecting the structure according to an electrical signal induced in the detection coils (2a,2b) by the magnetic field and to evaluate the distance value according to a difference of the electrical signal in-between at least two of the detection coils (2a,2b).
    According to the invention, the device (1) comprises a calibration unit built to configure one of the detection coils (2a,2b) as transmitter for a calibration field (At,Bt) by applying an electrical excitation signal, which calibration field (At,Bt) is detected by the remaining of the detection coils (2a,2b) and whereof calibration parameters for the detection coils (2a,2b) are determined.

    摘要翻译： 本发明涉及一种移动检测设备（1），用于根据其发出的磁场（如地下服务的位置）评估从设备到被遮挡的交流载流结构的距离值。 该装置包括相互间隔开一定间隔（3）布置的多个检测线圈（2a，2b）和用于根据由检测线圈（2a，2b）中感应的电信号通过 并根据至少两个检测线圈（2a，2b）之间的电信号的差异来评估距离值。 根据本发明，装置（1）包括校准单元，该校准单元被构建为通过施加电激励信号来将检测线圈（2a，2b）中的一个构造为校准场（At，Bt）的发射器，该校准场（At ，Bt）由剩余的检测线圈（2a，2b）检测，并且确定检测线圈（2a，2b）的校准参数。

    SYSTEMS AND METHODS FOR RESISTIVITY MEASUREMENT
    6.
    发明公开
    SYSTEMS AND METHODS FOR RESISTIVITY MEASUREMENT 有权
    系统和方法测量电阻DESSPEZIFISCHEN

    公开(公告)号：EP1588193A1

    公开(公告)日：2005-10-26

    申请号：EP04704284.1

    申请日：2004-01-22

    申请人： Natural Environment Research Council

    发明人： OGILVY, Richard D. ,  MELDRUM, Philip I. ,  KURAS, Oliver ,  BEAMISH, David

    IPC分类号： G01V3/06

    CPC分类号： G01V3/06

    摘要： Disclosed is a measurement system for measuring subsurface resistivity. The surfaces of interest are, for example, engineered surfaces such as roads and dams, and non-engineered surfaces such as greenfield sites. The measurement system may also be used on biological materials. The system (10) includes signal input electrodes (16a, 16b) for inputting an input signal into subsurface material by capacitive coupling. Pairs of signal detection electrodes (24a, 24b; 26a, 26b) allow capacitive coupling detection of a detectable signal caused by the input signal in at least some of the subsurface material. A phase-sensitive meter (30; 34) such as a lock-in amplifier is provided to measure the amplitude and phase of the detectable signal.

    LOCATOR OF ELECTRICALLY CONDUCTIVE OBJECTS
    7.
    发明授权
    LOCATOR OF ELECTRICALLY CONDUCTIVE OBJECTS 失效
    定位导电物体

    公开(公告)号：EP0898719B1

    公开(公告)日：2004-09-08

    申请号：EP98907049.5

    申请日：1998-02-25

    申请人： RADIODETECTION LIMITED

    发明人： HOPWOOD, Michael, Peter ,  FROST, Nicholas, James

    IPC分类号： G01V3/06

    CPC分类号： G01V3/06

    摘要： In order to locate an electrically conductive object (2), such as a buried cable or pipe, the electromagnetic field generated by a current in the object (2) is detected by a detector having a plurality of spaced apart antennae (3, 4, 5). Those antennae (3, 4, 5) have aerial arrangements which are not all identical. In order for the location of the object (2) to be derivable by measurements by the antennae (3, 4, 5), two or more of the antennae together have at least four aerials (10, 11, 12, 13, 14, 15), with first and second aerials (11, 13, 14) measuring field components in a direction perpendicular to the direction of separation of the antennae, the third aerial (10, 12) measuring field components parallel to the direction of separation, and the fourth aerial (15) measuring the field components in a direction mutually perpendicular to the directions of the field component measured by the first, second and third aerials. Moreover, at least one antennae (3, 4, 5) measures a component in a direction not measured by at least one other antennae (3, 4, 5).

    Tone transmission over cable sheaths for cable location
    8.
    发明公开
    Tone transmission over cable sheaths for cable location 审中-公开
    TonübertragungüberKabelmantel zur Lokalisierung des Kabels

    公开(公告)号：EP1107023A1

    公开(公告)日：2001-06-13

    申请号：EP99309710.4

    申请日：1999-12-02

    申请人： NORSCAN INSTRUMENTS, LTD.

    发明人： Vokey, David E.

    IPC分类号： G01V3/06

    CPC分类号： G01V3/06

    摘要： A transmission enhancement system is used for strengthening low frequency cable locating signals on the metallic shields of long underground cables. The system includes equalization circuits on the cable armour or shield (10) at regular intervals, for example at splice locations. The equalization circuits includes an inductor (20) that significantly reduces the rate of attenuation of the low frequency tone signal and greatly enhances the strength of the signal at distances where the signal would otherwise be very weak or unusable. The equalization circuit may be a resonant circuit having a capacitor (24) connected in parallel with the inductor. The capacitor compensates for the inductor's attenuation of high frequency tones for local location purposes. The preferred embodiments of the equalization circuit include a surge arrestor (26) coupled in parallel with the inductor and capacitor.

    摘要翻译： 传输增强系统用于加强长地下电缆金属屏蔽层上的低频电缆定位信号。 该系统包括例如在接合位置处的规则间隔的电缆护套或屏蔽件（10）上的均衡电路。 均衡电路包括电感器（20），其显着降低低频音调信号的衰减速率，并且大大增强信号在信号否则将非常弱或不可用的距离处的强度。 均衡电路可以是具有与电感器并联连接的电容器（24）的谐振电路。 电容器补偿电感器对高频音调的衰减，用于本地定位。 均衡电路的优选实施例包括与电感器和电容器并联耦合的浪涌抑制器（26）。

    Detecting the condition of a concealed object
    9.
    发明公开
    Detecting the condition of a concealed object 失效
    一个埋藏对象的条件判断

    公开(公告)号：EP0825456A3

    公开(公告)日：2000-07-12

    申请号：EP97306269.8

    申请日：1997-08-19

    申请人： RADIODETECTION LIMITED

    发明人： Hanlon, Jason Julian ,  Regini, Andrzej Zbigniew

    IPC分类号： G01V3/06

    CPC分类号： G01V3/06

    摘要： A system for detecting faults in the insulation layer surrounding a concealed conducting pipe (10) includes a signal generator (12) for applying an alternating current with a frequency of around 4Hz to the pipe, a magnetometer (102) for detecting the alternating current from the pipe (10) and a CPU (115) for identifying changes in the gradient of the detected current along the length of the concealed conducting pipe (10) which are caused by the faults in the insulation layer. The magnetometer (102) is used in connection with a locator(100) which detects a second alternatinq current applied to the pipe (10) by the singal generator (12), this second alternating current having a frequency of around 128Hz. The system can also use both these signals to determine the direction of the signals emulating from the pipe (10).