Deep sea geomagnetic field survey instrument circuit

Abstract

The invention relates to a circuit of a deep-sea geomagnetic measuring instrument. The precision of the existing device is too low, thereby being lack of practical significance in the application of analyzing the geomagnetic micro-change of a small ocean bottom region. The circuit comprises a power supply circuit, a setting / resetting circuit, a sensing measuring circuit and a main control circuit, wherein, the sensing measuring circuit comprises a single-axis magnetoresistive sensor chip IC4, a dual-axis magnetoresistive sensor chip IC5, three same operational amplifier circuits 5, a high-precision AC chip IC6 and a voltage reference chip IC7. The main control circuit comprises a main control chip IC8, a gyroscope chip IC9, a level conversion chip IC10 and a reading / writing interface J1 of an SD card. The circuit adopts the magnetoresistive sensing technology to constitute a deep-sea geomagnetic measuring circuit and utilizes the characteristics of high sensitivity and low power consumption of the magnetoresistive sensors, thereby having simple circuit connection, reducing the noise by 1 / f and improving the effective resolution.

Description

technical field The invention belongs to the technical field of deep-sea magnetic prospecting, and in particular relates to a deep-sea near-bottom geomagnetic three-component measuring instrument circuit based on a magnetoresistance sensor. Background technique Magnetic prospecting has always been one of the effective means of geological survey and exploration. As countries around the world pay more and more attention to the development of seabed mineral resources, magnetic prospecting has gradually been applied in the marine field. How to develop a variety of geomagnetic measuring instruments used in the ocean according to different demand backgrounds, so as to effectively ascertain the distribution of ferromagnetic ore bodies on the seabed, is the key to the current marine magnetic exploration method. Among various marine magnetometers, the geomagnetic three-component magnetometer near the seabed is currently the focus of development. In order to obtain shorter-wavelength ...

AI Technical Summary

Problems solved by technology

The object of the present invention is to provide a deep-sea and near-bottom geomagnetic three-component measuring instrument circuit based on a magnetoresistive sensor, so as to overcome the defects of low precision and low stability of the fluxgate geomagnetic measuring instrument circuit

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