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Wuhan Dida Huarui Geological Technology Co., Ltd
CUGTEM-19Rad Ultra Shallow Transient Electromagnetic Instrument
NegotiableUpdate on 10/16
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Overview
With the increasing demand for advanced shallow and high-precision detection in railways, highways, and tunnel mines, the use of small coil high current transient electromagnetic method is becoming more and more frequent. The mutual inductance effect of the transmitting and receiving coils urgently needs to be solved, and there is an urgent need for a detection instrument that can effectively reduce mutual inductance and work efficiently, suitable for cities and small spaces. The CUG-TEMRad transient electromagnetic detection system is developed based on the principle of coplanar equivalent anti magnetic flux, combined with the long-term development experience of Dida Huarui in the transient electromagnetic industry. This system can overcome the problem of "blind spots" inherent in transient electromagnetics and perform effective ultra shallow detection, as well as use a "large central loop" device for deep detection. It has both ultra shallow and deep detection capabilities, which can reduce the use of multiple instruments for repetitive construction.
Product Details
1. System Introduction
With the increasing demand for advanced shallow and high-precision detection in railways, highways, and tunnel mines, the use of small coil high current transient electromagnetic method is becoming more and more frequent. The mutual inductance effect of the transmitting and receiving coils urgently needs to be solved, and there is an urgent need for a detection instrument that can effectively reduce mutual inductance and work efficiently, suitable for cities and small spaces.
The CUG-TEMRad transient electromagnetic detection system is developed based on the principle of coplanar equivalent anti magnetic flux, combined with the long-term development experience of Dida Huarui in the transient electromagnetic industry. This system can overcome the problem of "blind spots" inherent in transient electromagnetics and perform effective ultra shallow detection, as well as use a "large central loop" device for deep detection. It has both ultra shallow and deep detection capabilities, which can reduce the use of multiple instruments for repetitive construction.
2. Product principle
Reasons for detecting blind spots using transient electromagnetic method
Transient Electromagnetic (TEM) is a method of using an ungrounded or grounded source to emit a pulsed electromagnetic field into the ground, and observing the underground eddy current field intermittently during one pulse. Currently, the common receiving method of TEM is to use an induction coil to measure the rate of change of the magnetic field. Due to the fact that when the emitting current is turned off, the receiving coil itself generates induced electromotive force, which is superimposed on the induced electromotive force generated by the underground eddy current field, it causes distortion of the early signal in TEM measurement and forms a detection blind spot.
Principle of coplanar equivalent anti magnetic flux
Coplanar equivalent anti magnetic flux device, through the mutual cancellation of positive and negative transmitting coils, forms a zero magnetic flux region in the receiving coil.
Due to the fact that the compensation coil and the receiving coil are located inside the transmitting coil, the entire working device can be compressed to the minimum volume and weight, while ensuring the area of the receiving coil and the transmission energy of the transmitting device.
By using high-strength non-metallic materials for overall processing, the positive and negative fields inside the receiving coil cancel each other out, without the need for on-site adjustment in the work area.
By using working devices of different sizes, it is possible to adapt to measurement conditions at different depths without wasting work time on site for adjustments.
Application field
1. Shallow surface detection without blind spots, with a minimum detection distance of up to one meter
2. Geological survey of shallow surface structure distribution, structural water content, etc
3. Non destructive testing of leakage hazards in dams and other engineering projects, with high sensitivity detection capabilities for both dam foundations and bodies
4. Detection of karst hazards in foundations such as bridge foundations, roadbeds, and high-rise buildings, with a depth of up to 300 meters
5. Exploration of hidden water conducting structures encountered during tunnel excavation
6. Geological investigation of water environmental disasters such as groundwater pollution.
3. Main features
1. The coplanar equivalent anti magnetic flux transmission and reception integrated coil is lightweight and simple, and has the ability to detect large depths without blind spots.
2. The transmitter and receiver have the characteristics of small size, light weight, and easy construction. And the receiver is designed with a lightweight metal flat plate, which is lightweight, sturdy, waterproof, and operates on a touch screen, making it easy to carry and construct.
3. High performance and low power consumption. 2G memory, 120GB hard drive, CPU with 2.24GHz dual core processor, no latency in operation.
4. Using a 32-bit AD conversion chip, it has high measurement accuracy and wide dynamic range.
5. By using patented technology, we have broken through the concept of blind spots, overcome technical difficulties such as inability to measure and inaccurate measurement in shallow areas, and can accurately measure anomalies as shallow as one meter.
6. Advanced interpretation software system. A full space interpretation software system for underground (underground tunnels, tunnels, etc.) work, user-friendly, one click filtering, and one click mapping.
7. We have anti-interference coil modules and devices, as well as co planar equivalent anti magnetic flux invention patents. Not only does it have the characteristic of no blind spots, but it also has the ability of deep detection.
8. A universal receiver, equipped with different transmitters, can meet the requirements of explosion-proof environment in coal mines, tunnel advance prediction, and transient electromagnetic detection in surface environments.
9. It can be interconnected with an online processing and interpretation system for advanced detection data, enabling real-time upload, storage, interpretation, and mapping of geophysical data.
CUGTEM-19RadUltra shallow layerTransient electromagnetic instrument-Main Configuration Table
Case 1: Reservoir Penetration Detection
To investigate the leakage situation of a reservoir in Linhai City, Zhejiang Province, ultra shallow transient electromagnetic detection was conducted on a 123 meter long measuring line above the Shuangqiao Reservoir dam, and the leakage position within 35 meters below the dam crest was analyzed. One survey line is arranged in the work area, with a length of 123 meters and a distance of 1 meter between points, totaling 124 physical measurement points. The detection result diagram is shown in the following figure: the first leakage position is determined as the leakage position, and the second, third, and fourth leakage positions are inferred positions.
Case 2: Reservoir Penetration Detection
To investigate the backfilling situation of a certain road in Shanghai, ultra shallow transient electromagnetic detection was conducted in the ancient river channel backfilling area of Lianyi Road in Shanghai, and urban road survey was carried out in the designated work area. A total of 4 survey lines were set up this time, and the detection results are shown in the figure: based on the detection results of ultra shallow transient electromagnetic waves, the location of the ancient river channel was inferred, and the morphology of the ancient river channel was displayed.
Two dimensional resistivity imaging of Shanghai Lianyi Road survey line
Construction photos
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