Multi-component seabed magnetic field measurement method and device

Abstract

The invention discloses a multi-component seabed magnetic field measurement method and device. According to the measurement device, an observation system is composed of 1 scalar magnetic sensor and 4vector magnetic sensors, and the total magnetic field, component magnetic fields and magnetic-field gradient tensor can be obtained accurately. The measurement device comprises a seabed magnetic fieldacquisition station casing, first to fourth support arms, first to fourth vector magnetic sensors, a pressure-resistant glass chamber, the scalar magnetic sensor, a power assembly, a communication cable, a bearing chamber, a collection circuit, a connection port and a sidelobe connector. According to the measurement method and device of the invention, the scalar magnetic sensor is used in combination with the vector magnetic sensor, the measuring precision of magnetic field components can be improved effectively after correction, the seabed magnetic tensor can be measured via a few of magnetic sensors, more information of field source characteristics and details can be obtained, and a new technical means is provided for research on magnetic abnormity of the sea.

Description

technical field [0001] The invention belongs to the field of geophysical measurement, in particular to the field of marine survey, and relates to a multi-component submarine magnetic field measurement method and device. Background technique [0002] As a commonly used geophysical detection technology, magnetic field detection has been widely used. In the submarine magnetic survey, the magnetometer is placed on the seabed for long-term observation. It is used for submarine structure detection, submarine geomagnetic daily variable station, submarine seismic monitoring and Target detection and other requirements are important technical means in the field of marine research. [0003] The geomagnetic field is a vector field with direction and amplitude. Its measurement often includes: total field modulus measurement, total field modulus gradient measurement, component measurement and component gradient measurement, etc. The rate of change of the three-component magnetic field in ...

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Problems solved by technology

[0006] The sensors used to measure the magnetic field are mainly divided into two categories, one is to directly measure the scalar value of the geomagnetic field, the absolute measurement accuracy is high, but the component information cannot be measured; the other is to detect the component of the magnetic field on the sensitive axis of the sensor, which can be obtained at the same time The magnitude and direction of the geomagnetic field, but the absolute measurement accuracy is not high, and the resolution is relatively poor

According to existing research, in order to accurately measure the gradient tensor, at least ten single-axis magnetic field sensors are required, and the magnetic field gradient tensor cannot be measured simply by using a scalar magnetic probe

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