A Broadband Composite Magnetic Sensor

Abstract

The invention relates to a broadband composite magnetic sensor. An inductive magnetic sensor primary probe and an inductive magnetic sensor secondary probe are installed at two ends. A fluxgate sensor probe is installed at the middle position of an inductive sensor hollow magnetic core. The inductive magnetic sensor primary probe, the inductive magnetic sensor secondary probe and the fluxgate sensor probe are fixed in a shell and are connected to a conditioning circuit through multi-core shielding cables. The broadband composite magnetic sensor has a high frequency working mode and a low frequency working mode, the fluxgate sensor probe is fixed to a composite magnetic sensor structure at the middle position of the inductive magnetic sensor primary probe and the inductive magnetic sensor secondary probe. Compared with a traditional single fluxgate sensor, the broadband composite magnetic sensor has the advantages that the sensitivity of a fluxgate sensor is improved, disadvantages that the high frequency noise of the single fluxgate sensor is high, the low frequency noise of a single inductive magnetic sensor is high, and a static magnetic field can not be measured are overcome, and the measurement of a wideband and low noise magnetic field is realized.

Description

[0001] Technical field: [0002] The invention relates to a magnetic field monitoring device, in particular to a broadband composite magnetic sensor for monitoring the earth's magnetic field. [0003] Background technique: [0004] Inductive magnetic sensors and fluxgate sensors are widely used in magnetic field monitoring in different environments, but limited by their own working principles, inductive magnetic sensors can only measure alternating magnetic fields, and the lower the frequency, the greater their own noise; the fluxgate The sensor can measure the magnetic field in the DC-kHz range, but the noise is large in the high frequency band. The noise comparison between the inductive magnetic sensor and the fluxgate sensor is as follows: figure 1 shown. [0005] Aiming at the problem that a single inductive magnetic sensor or fluxgate sensor cannot realize full-band low-noise magnetic field measurement, CN102736113A proposes an ultra-wideband weak magnetic sensor suitable...

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Problems solved by technology

[0004] Inductive magnetic sensors and fluxgate sensors are widely used in magnetic field monitoring in different environments, but limited by their own working principles, inductive magnetic sensors can only measure alternating magnetic fields, and the lower the frequency, the greater their own noise; the fluxgate The sensor can measure the magnetic field in the DC-kHz range, but the noise is large in the high frequency band. The noise comparison between the inductive magnetic sensor and the fluxgate sensor is as follows: figure 1 shown

[0005] Aiming at the problem that a single inductive magnetic sensor or fluxgate sensor cannot realize full-band low-noise magnetic field measurement, CN102736113A proposes an ultra-wideband weak magnetic sensor suitable for DC-10kHz, using a cuboid high-permeability magnetic rod as an inductive magnetic field. The sensor core, and the sensitive element of the time difference fluxgate sensor is pasted on the surface. This composite magnetic sensor can realize broadband magnetic field measurement, but due to the influence of the high permeability magnetic rod on the fluxgate sensitive element, the magnetic field of this structure Pass door sensor has low sensitivity

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