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1. 发明申请

WO1981001617A1 A METHOD AND APPARATUS FOR DETERMINING THE ELECTRICAL CONDUCTIVITY OF THE GROUND 审中-公开
标题翻译：一种确定地面电导率的方法和装置
公开(公告)号：WO1981001617A1
公开(公告)日：1981-06-11
申请号：PCT/SE1980000306
申请日：1980-11-28
申请人： BOLIDEN AB , NILSSON B
发明人： BOLIDEN AB
IPC分类号： G01V03/17
CPC分类号： G01V3/165
摘要： Method and apparatus for determining the electrical conductivity of the ground, particularly in connection with aerial prospecting, with the use of a transmitter unit (S) and a receiver unit (M) located at a distance from said transmitter unit and particularly carried by an aircraft (21). The transmitter is arranged to generate an electromagnetic field which induces an electric current in the ground, and the receiver is arranged to measure magnetic and electric fields induced by said current at the measuring site, said fields representing a measurement of said electrical conducitivity and variations therein. The magnet field from the transmitter is transmitted horizontally as is directed transversally of an imaginary line that connects the transmitter (S) with the receiver (M). The electric field E from the transmitter is measured in the receiver in a radial direction to the transmitter. The magnetic field (H) is measured in a direction parallel with the magnetic transmitter-field. Of the measured magnitudes (E and H) the ratio (E/H) and/or the phase difference (Alpha) are formed, both of which are dependent on the electrical conductivity of the ground.

2. 发明申请

WO1994027168A1 ELECTROMAGNETIC HIDDEN OBJECT DETECTOR 审中-公开
标题翻译：电磁隐藏物体检测器
公开(公告)号：WO1994027168A1
公开(公告)日：1994-11-24
申请号：PCT/US1994004813
申请日：1994-05-09
申请人： THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
发明人： THE REGENTS OF THE UNIVERSITY OF CALIFORNIA , McEWAN, Thomas, E.
IPC分类号： G01V03/17
CPC分类号： G01S7/285 , G01F23/284 , G01S5/06 , G01S13/003 , G01S13/0209 , G01S13/0218 , G01S13/04 , G01S13/103 , G01S13/106 , G01S13/18 , G01S13/885 , G01S2013/9314 , G01S2013/9321 , G01V3/12 , G08G1/04 , H04B1/7163 , H04B1/71637
摘要： An electromagnetic detector (1, 100) is designed to locate an object (22, 122) behind a separator. The detector (1, 100) includes a PRF generator (10, 104) for generating 2 MHz pulses, a homodyne oscillator (102) for generating a 2 kHz square wave, and for modulating the pulses from the PFR generator (10, 104). A transmit antenna (18, 188) transmits the modulated pulses through the separator (24), and a receive antenna (20, 120) receives the signals reflected from the separator (24). The receiver path of the detector (1, 100) includes a sample and hold circuit (26), an AC coupled amplifier (129) which filters out DC bias level shifts in the sample and hold circuit (26), and a rectifier circuit (130) connected to the homodyne oscillator and to the AC coupled amplifier (129), for synchronously rectifying the modulated pulses transmitted over the transmit antenna (18, 118). The homodyne oscillator (102) modulates the signal from the PFR generator (10, 104) with a continuous wave (CW) signal, and the AC coupled amplifier (129) operates with a passband centered on that CW signal.
摘要翻译：电磁检测器（1,100）被设计成将分离器后面的物体（22,122）定位。检测器（1,100）包括用于产生2MHz脉冲的PRF发生器（10,104），用于产生2KHz方波的零差振荡器（102）和用于调制来自PFR发生器（10,104）的脉冲，。发射天线（18,188）通过分离器（24）传送调制脉冲，接收天线（20,120）接收从分离器（24）反射的信号。检测器（1,100）的接收器路径包括采样和保持电路（26），滤波采样和保持电路（26）中的DC偏置电平偏移的AC耦合放大器（129）和整流器电路 130），连接到零差振荡器和AC耦合放大器（129），用于同步整流在发射天线（18,118）上传输的调制脉冲。零差振荡器（102）用连续波（CW）信号调制来自PFR发生器（10,104）的信号，并且AC耦合放大器（129）以以该CW信号为中心的通带进行操作。

3. 发明申请

WO1985000666A1 A SEARCH DEVICE FOR LOCALIZING SUBTERRANEAN RESONANT FIXPOINT MARKERS 审中-公开
标题翻译：用于定位亚太地区共振固定标记的搜索装置
公开(公告)号：WO1985000666A1
公开(公告)日：1985-02-14
申请号：PCT/DK1984000072
申请日：1984-07-27
申请人： PEDERSEN, Willy, Palle
IPC分类号： G01V03/17
CPC分类号： G01V3/15
摘要： A search device for localizing subterranean fixpoint markers of the resonant type is provided with an emitter system (20, 38) of generally vertical orientation and a receiver system (22, 44, 46, 48), which is mounted in the near field of the emitter system orthogonally thereto. In use, the receiver system is horizontally oriented, whereby it will produce a minimum or zero reading whenever its mid-normal intersects with the electromagnetic axis of the marker, in the near field of the marker, and a very high localization accuracy is obtainable hereby.

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