Transient electromagnetic radar detection system and detection method

Abstract

The invention relates to a transient electromagnetic radar detection system and a detection method. The transient electromagnetic radar detection system comprises a radar electromagnetic emission system, an electromagnetic collection system and a computer. By means of multiple times of electromagnetic pulse excitation, multiple times of superposition observation and spatial coverage are conducted, random disturbance is conducted on reflection wave suppression through data processing, and therefore the signal to noise ratio is increased, and identification of effective waves is achieved. The requirements for different detection depths and different detection objects can be met. A high-speed or high-precision mode can be selected according to engineering requirements. By means of overlapped loop antennas in different specifications, good coupling with targets with different depths and different sizes can be achieved, and the large emission magnetic torque and receiving magnetic torque are obtained. By means of the transient electromagnetic method scanning technique, transient electromagnetic detection efficiency is improved greatly, the highest scanning speed can reach 2 m / s, and large-scale detection in a city is facilitated. The transient electromagnetic radar detection system is compatible with four antenna devices which are an overlapping loop device, a central loop device, a dipole device and a large fixed loop source device, and the devices are simple in structure and convenient to carry, and suitable for various types of ground and underground engineering detection.

Description

technical field [0001] The invention relates to a transient electromagnetic instrument and a detection method thereof. Background technique [0002] The methods of engineering geophysical prospecting and ore prospecting exploration using the principle of electromagnetic induction are collectively called electromagnetic methods. The most commonly used technologies in ground engineering are geological radar and transient electromagnetic technology. The difference between the two lies in the difference in the center frequency of the emitted pulse electromagnetic wave. The former Generally from 12.5MHZ to 1200MHZ, the latter generally from 0HZ to 500HZ. [0003] As a broad-spectrum shallow geophysical prospecting technology, GPR has been widely used in engineering site survey, engineering quality inspection, pipe network detection and archaeological exploration, etc. It has the characteristics of fast, efficient and non-destructive. Although commercial applications have been ac...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a detection method of a transient electromagnetic radar detection system, which combines the advantages of geological radar and transient electromagnetic, can overcome the problem of fixed-point measurement of ground transient electromagnetic detection, realize mobile scanning detection, and can Make up for technical problems such as limited detection depth of geological radar, difficult lateral positioning and serious interference, and finally realize fast, convenient and non-destructive detection of geological bodies from the surface to larger depths, and provide various antenna combinations to adapt to engineering detection in various environments

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