A high-sensitivity compensation type underground metal unexploded ordnance detection device and detection method

Abstract

The invention relates to a high-sensitivity compensation type underground metal unexplosives detection device and a detection method. The device includes a first receiving coil and a second receiving coil having the same structure, symmetrically placed at both ends of the transmitting coil up and down, and differentially connected in parallel; The control and matching module forms a resonant circuit with the first receiving coil and the second receiving coil; the transmitting controller controls the transmitting coil to excite; the receiving controller is synchronized with the transmitting controller, and controls the controllable distribution through six-channel isolation drive according to the transmitting frequency. One of the switches in the harmonic module is closed, and the differential amplifier amplifies the output signal of the controllable harmonic module; the dual receiving coil position structure is used to eliminate the influence of the primary field and environmental electromagnetic noise by using the differential structure, and the detection of abnormal metal objects is improved. sensitivity. The invention can further improve the detection sensitivity by removing the background field, adopts multi-frequency emission, can meet the requirements of different detection depths, and can quickly and accurately locate the position of the abnormal metal body.

Description

technical field [0001] The invention relates to the field of underground metal unexploded ordnance detection, in particular to a high-sensitivity compensation type underground metal unexploded ordnance detection device and a detection method. Background technique [0002] Reliable and effective positioning detection of underground metal unexploded ordnance is of great significance and has been highly valued by various countries. Most of the current detection instruments are based on the principle of electromagnetic induction, and are positioned and judged by observing the secondary field signal generated by the eddy current effect of metal unexploded objects in the receiving device. However, the current detection devices and methods still cannot meet the actual needs in terms of detection sensitivity, detection efficiency, detection depth and detection reliability. The specific deficiencies are mainly reflected in the following aspects. [0003] 1. The receiving coil is aff...

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Problems solved by technology

However, the current detection devices and methods still cannot meet the actual needs in terms of detection sensitivity, detection efficiency, detection depth and detection reliability. The specific deficiencies are mainly reflected in the following aspects

[0003] 1. The receiving coil is affected by the primary field of the transmitting coil, so that the receiving device obtains the main component of the primary site in the signal, while the secondary field is small, especially when the metal unexploded objects are small or buried deep, it is difficult to detect If an effective signal is detected, that is, affected by the emission, the detection sensitivity is reduced, or even the detection fails; second, the electromagnetic noise of the external environment and the background field of the underground rock formation will also submerge the secondary field signal generated by the metal unexploded ordnance; third, most of the current detection devices are Based on single-frequency or dual-frequency transmission mode, the detection depth is relatively shallow, and there is also the problem of poor detection sensitivity

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