LTEM-18 Type High-Power Transient Electromagnetic Instrument

  • Introduction
  • Parameter
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    The LTEM 18 model High-Power Transient Electromagnetic instrument can currently emit pulse currents with an effective value of up to 100A. By increasing the transmission power, the secondary field is enhanced, which improves the signal-to-noise ratio (SNR) and thus increases the exploration depth. The use of repeated measurements and superposition of the secondary field excited by multiple pulses, along with the application of spatial domain multiple coverage techniques, also enhances the SNR. It is capable of being employed in complex working environments with significant noise interference, such as underground mines, tunnel tops, bottom plates, and advanced detection areas. This model features an integrated design of the receiver and transmitter, abandoning the traditional high-power transmitter to reduce the labor intensity of technical personnel at complex construction sites and improve work efficiency. The non-contact transmission and reception coils are integrated into a compact structure, making the system lightweight, easily transportable, and convenient to operate.

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    Applications

    Advanced detection in tunnels, with an effective detection distance of more than 150 meters.

    Exploration of geological structures around tunnels and galleries, detecting the structure distribution and water content of mines from the surface downwards.

    Investigation of hidden water-conducting structures during excavation.

    Detection of well-conductive ore bodies, their burial depth, and ore-bearing structures, along with other engineering and environmental explorations.

    Detection of the direction of ore veins in underground metal mines.

    Detection of structures around underground caverns, metal pipelines detection.

    Investigation of water sources in goaf areas and abandoned small coal mines, as well as sinkhole columns and other explorations.

    Specifications

    Transmitting Current Intensity

     100A

    Current Pulse Width

     1ms, 2ms, 3ms, 4ms, 5ms

    Current Emission Frequency

     256Hz, 75Hz, 62.5Hz, 12.5Hz, 6.25Hz, 1.5625Hz, lower; Unmodulated single rectangular pulse output, frequency error ±2%

    Coil Specifications

     1m*1m to 5m*5m (customizable by the user)

    Power Output Voltage

     16.8±0.2V

    Number of Stacks

     Unlimited, optional;

    Shutdown Time

     0.1-20uS (related to coil inductance)

    Emission Waveform

     Bipolar rectangular wave

    Main Control Unit

     Military-grade low-power embedded system

    Number of Channels

     Up to 1024 channels (user-definable)

    A/D Converter

     24 bit

    Minimum Sampling Interval

     1μS

    Dynamic Range

     140 dB

    Background Noise

     0.1uV

    Port

     USB2.0

    Memory

     2GB

    Data Storage

     16GB

    Display

     TFT 10.4 inches (1024*800) 32-bit true color screen, LED backlight

    Hardware Platform

     Embedded ARM processor Cortex-A8

    Touch Screen

     10.4-inch high-precision touch screen

    Interpretation Software

     Intelligent data processing and interpretation, one-click automatic mapping system, capable of matching and achieving 3D imaging display technology

    Power Supply

     Built-in high-performance rechargeable battery

    Continuous Working Time

     Over 10 hours

    Main Unit Dimensions

     406x330x174 (mm) (Length × Width × Height)

    Main Unit Weight

     About 3.5Kg

    Operating Temperature

     -20℃ to +40℃

    Cases

    In a certain mine gallery, a detection of water-richness was conducted in the area 120 meters around the heading face and along the layer, aiming to analyze potential geological conditions such as fault structures.

    Three-dimensional imaging shows that from directly ahead of the roof to along the layer, and in the direction slightly to the left by 0-15 degrees from the front, there are low-resistance areas within the 10~30m range and the 50~100m range from the working face, as indicated by the light blue areas in the figure. This anomaly is distributed from top to bottom, showing a certain degree of coherence and connectivity, with an overall apparent water-richness. Combining with the actual geological conditions, it is inferred that the anomaly might be a fault that extends from the top down. Based on this prediction, the mine conducted drilling in this direction, and three groups of boreholes produced water at close range, which was then drained and treated. The prediction was effective.

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    3D Diagram


    Inclined Shaft Granite Driveway Advanced Forecasting

    Conducting transient electromagnetic method advanced exploration at the 873 meter point of the inclined shaft to determine the location of the front fracture water-rich area with dense water content.

     

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    Advanced Exploration Results of 5 Profiles


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    Longitudinal Detection Maps of Three Profiles: 30 Degrees to the Left, Directly Ahead, and 30 Degrees to the Right


    Transient electromagnetic detection focuses on the layer-parallel direction (leaning downward at 20 degrees) for central analysis. The overall low-resistance area is distributed directly ahead and to the right of the front within a 0-60 degree area, with a distinct low-resistance anomaly observed within 10-50 meters directly ahead. From the roof downward, the resistivity and range of the low-resistance anomaly area gradually increase, suggesting a possible water-rich area ahead, mainly directly ahead and slightly to the right (as specifically indicated by the red dashed line on the map).

    From a comprehensive analysis of both longitudinal and transverse profiles, the water-rich area ahead is primarily located in the layer-parallel direction and downward towards the bottom plate in the same direction. Altogether, it can be inferred that within a 10-50 meter range directly ahead and to the right by 60 degrees, primarily in the layer-parallel direction and downward towards the 60-degree bottom plate area, constitutes the main water-rich area. It is recommended that the mine focuses on drilling verification and subsequent treatment in this direction.


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