Inductive magnetic field sensor used for underwater magnetic anomaly network

Abstract

The invention provides an inductive magnetic field sensor used for an underwater magnetic anomaly network. The inductive magnetic field sensor comprises a three-shaft magnetic field sensor module, a signal processing module and a signal acquisition circuit, wherein the three-shaft magnetic field sensor module comprises three sensor bodies with every two of the detection directions perpendicular to each other; the signal processing module comprises three signal processing circuits which are connected with the three sensor bodies respectively and used for amplifying and filtering signals output from the three sensor bodies; the signal acquisition circuit is connected with the three signal processing circuits of the signal processing module and used for adjusting the signal bandwidth of the amplified and filtered signals to preset bandwidth and acquiring and outputting the three sets of signals. According to the inductive magnetic field sensor used for the underwater magnetic anomaly network, due to the fact that magnetic disks are additionally arranged at the two ends of an original long and thin magnetic core and used for gathering magnetic flux, the length-diameter ratio of the magnetic core is equivalently improved, and the sensitivity of the magnetic field sensor is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic field sensors in the electronics industry, in particular to an inductive magnetic field sensor used in an underwater magnetic anomaly network. Background technique [0002] High-performance magnetic field sensors can be used to detect magnetic field anomalies caused by targets, such as submarine monitoring networks of important ports, underwater target detection and tracking, submarine monitoring and early warning networks, land monitoring networks, etc., which are passive , It is not easy to be found by the target body, and the anti-interference ability is strong. [0003] In 2004, the research department of the Italian Navy developed a set of anti-frogman port protection system (Magnetic-Acoustic System, referred to as the MAC system). Early warning detection. A research team under the Israel Atomic Energy Agency has carried out a study on the detection, location and tracking of moving target...

AI Technical Summary

Problems solved by technology

However, the sensitivity of magnetoresistive magnetic field sensors is generally greater than 1nT / √Hz, which not only recognizes the target at a short distance, but also cannot identify some small targets, which seriously restricts the range and accuracy of underwater military monitoring.

Although the sensitivity of the fluxgate magnetic field sensor is low, generally 5pT / √Hz, its power consumption is relatively large, generally 400mW, which requires high energy supply for the seabed, especially in the case of multiple nodes. The military monitoring network consumes a lot of money and is not suitable for applications in submarine detection and monitoring systems with demanding power requirements

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