Methods and data acquisition systems enable joint acquisition of seismic and electromagnetic data in a target area using stand-alone digital recorders.

The present invention provides a light weight, modular and rigid structure for supporting the transmitter loop of an airborne electromagnetic system. The airborne electromagnetic surveying system comprises a tow assembly connected to an aircraft, the tow assembly including a transmitter section comprising a transmitter coil for generating a primary electromagnetic field that induces a secondary electromagnetic field. The transmitter coil is supported by a generally rigid transmitter frame. The transmitter frame comprises a plurality of frame sections assembled in a way such that the generally rigid transmitter frame substantially retains a rigid shape during operation. The system may also include a receiver section located above the generally rigid transmitter frame in between the aircraft and the generally rigid transmitter frame for detecting the secondary electromagnetic field.

An apparatus for airborne electromagnetic surveying is provided, comprising a central hub defining an equatorial plane, a transmitter loop, and radials connecting the hub to the transmitter loop. The loop generally lies in a plane during flight, and comprises loop sections, some of which are connected with flexible joints allowing the loop to flex out of the plane during lift-offs and landings. A loop section comprises current conducting elements connected to current conducting elements of adjacent loop sections forming a transmitter loop circuit. A radial connects to the hub at a point that is substantially offset from the transmitter loop plane, thereby contributing to the stability of the transmitter loop connection point in an up-down direction relative to the hub. Additionally, a loop section comprising rigid conductive elements retained in a spaced-apart relationship by a frame member is also provided.

Disclosed are methods and systems for producing bipole source modeling with reduced computational loads. A method may comprise receiving first electromagnetic data and second electromagnetic data from a first shotpoint and a second of a marine electromagnetic survey, modelling a first electromagnetic field and second electromagnetic field for one or more dipole sources of a bipole source and combining a plurality of data points to provide an approximation of an electromagnetic field for the bipole source. A system may comprise electromagnetic sensors, a bipole source, wherein the bipole source comprise a pair of electrodes that are separated by a distance, wherein the bipole source is configured to generate an electromagnetic field, and a data processing system configured to receive electromagnetic data from a plurality of shotpoints of the bipole source and model electromagnetic fields for one or more dipole sources of the bipole source from the electromagnetic data.

A method and apparatus for generating an electromagnetic (EM) field from a sub-sea source is disclosed. In one embodiment, a sub-sea source includes a step-down transformer coupled to receive a sinusoidal source wave via a tow cable, and is further coupled to output a sinusoidal wave to a silicon-controlled rectifier (SCR) circuit. A control circuit coupled to the SCR circuit is configured to selectively activate various ones of the SCRs therein in order to control a portion of the sinusoidal wave that is rectified. The output current provided by the SCR is determined by the portion of the sinusoidal wave that is rectified thereby. The output current is provided to electrodes coupled to the sub-sea source, and the output current is passed therebetween. The strength of the EM field is based on the output current.

To improve the problems of conventional mine detectors, the purpose of the present invention is to provide a smart wearable mine detector comprising a human body antenna unit 100, a main microprocessor unit 200, a smart eyeglasses unit 300, a body-mounted LCD monitor unit 400, a wireless data transmission and reception unit 500, a belt-type power supply unit 600, a black box-type camera unit 700, and a security communication headset 800, the smart wearable mine detector: can be detachably worn on the head, torso, arm, waist, leg and the like of a body while a combat uniform is worn, thereby having excellent compatibility with conventional combat uniforms; enables a human body antenna unit which is detachably attached to a body and detects a mine through a super high-frequency RF beam and a neutron technique to be applied so as to detect the mine by identifying metals, nonmetals, and initial explosives of the mine; enables mines buried on the ground and under the ground to be detected in all directions (360), and a distance, location, form, and materials of the mines to be exhibited on smart eyeglasses and a body-mounted LCD monitor unit in real time as 2D or 3D images such that a combatant can engage in battle avoiding mines, thereby improving combat efficiency by 90% when compared to existing combat efficiency; enables a battle to be carried out for three to seven days through a twin self-power supply system of a portable battery and a belt-type power supply unit even without need for charging power; and enables combat situations in a remote place to be monitored, in real time, in a remote combat command server, and allows each combatant to share combat information one to one such that it is possible to construct a smart combat command system capable of remotely commanding real combat situations as if one was on site of the battle.

The disclosure relates to a power source assembly for powering high current low impedance devices from an Autonomous Underwater Vehicle, AUV, battery pack and/or auxiliary battery packs, comprising: one or more high current low impedance devices, a high current power source, wherein the high current low impedance device is powered by the high current power source, one or more AUVs, the one or more AUVs comprising an AUV and/or auxiliary battery pack, and the high current power sources, the high current low impedance device further comprising a high current supply module comprising an electronic circuit adapted to: supply a current from the AUV battery pack or AUV and/or auxiliary battery pack, store the supplied power in the high current power source, and supply high current to a connected high current output device.

The disclosure further relates to a method for maintaining the power source assembly and a system for a powering the high current low impedance devices.

Provided is a method for positioning and predicting concealed orebody based on parallel double-tunnel transient electromagnetic exploration, and belongs to the applied geophysics exploration technology. The method can locate and predict concealed orebodies with low resistivity around the tunnel in a full spatial domain based on a parallel double-tunnel transient electromagnetic method. The implementation of the method mainly includes measuring an electrical parameter, observing a tunnel transient electromagnet, calculating an apparent resistivity, determining an upper limit of an apparent resistivity abnormity, delineating the apparent resistivity abnormity and positioning and predicting concealed orebodies. The method can effectively solve the double-solution problem of positioning concealed orebodies in the full spatial domain of the tunnel.

This method can be used to locate or identify an object in an electrically conductive medium with a detection system that comprises n electrodes in direct electrical contact with the conductive medium. The n electrodes can be placed in at least three different states: transmitting, receiving, disconnected. Before a series of measurements, the operating point of the detection system is determined according to a given a priori setpoint, or a previous configuration of the system, or a previous measurement result of one of the electrodes, by the configuration of the state of each of the electrodes, the frequency of a sinusoidal component of an electrical signal transmitted by one of the transmitting electrodes, or the amplitude of the electrical signal transmitted by one of the electrodes configured in the transmitting or receiving state.

The disclosure relates to a power source assembly for powering high current low impedance devices from an Autonomous Underwater Vehicle, AUV, battery pack and/or auxiliary battery packs, comprising: one or more high current low impedance devices, a high current power source, wherein the high current low impedance device is powered by the high current power source, one or more AUVs, the one or more AUVs comprising an AUV and/or auxiliary battery pack, and the high current power sources, the high current low impedance device further comprising a high current supply module comprising an electronic circuit adapted to: supply a current from the AUV battery pack or AUV and/or auxiliary battery pack, store the supplied power in the high current power source, and supply high current to a connected high current output device. The disclosure further relates to a method for maintaining the power source assembly and a system for a powering the high current low impedance devices.