Metal detection system under multimode array excitation

Abstract

The invention discloses a metal detection system under multimode array excitation, wherein the metal detection system comprises a transmitting module, a receiving module and a multimode signal processing module; the transmitting module comprises a signal source and a transmitting array, the signal source is used for generating a rectangular alternating pulse signal, and the transmitting array generates an alternating magnetic field according to the rectangular alternating pulse signal; the receiving module comprises a receiving array and a signal acquisition module, the receiving array is usedfor receiving an alternating magnetic field with / without underground target interference and generating an induction signal, and the signal acquisition module is used for acquiring the induction signal and transmitting the induction signal to the multimode signal processing module. According to the invention, the signal source generates a signal with an adjustable duty ratio, so that the interference of a primary field is reduced; when the duty ratio of the signal is increased, the zero-level time of the transmitted signal is prolonged, the observation time is also prolonged, the time for acquiring the induction signal is also prolonged, and the induction signal acquired in the earlier stage can be removed to reduce the interference.

Description

technical field [0001] The invention belongs to the technical field of information detection, in particular to a metal detection system excited by a multi-mode array. Background technique [0002] At present, the underground targets detected by people include: unexploded bombs, metal pipelines, non-metal pipelines, etc. As unexploded weapons left over from wars or military exercises, unexploded ordnance may explode again even decades later, posing a threat to the safety of people's lives and property. As an indispensable living facility for modern humans, underground pipelines must be managed in detail so that the underground pipelines will not be cut off during urban construction, causing unnecessary property losses. [0003] The domestic and foreign detection of underground targets mainly includes electrical detection, magnetic detection, ground penetrating radar detection, thermodynamic detection, etc. Among these methods, electrical detection is based on the difference ...

AI Technical Summary

Problems solved by technology

Although the technology of using transient electromagnetic method to detect underground targets is becoming more and more mature, there are still problems, such as insufficient excitation of underground targets due to a single transmitting coil, limited detection range, and high impact of non-target magnetic field interference on detection accuracy

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