Earthquake electromagnetic disturbance observation system and observation method based on induction type magnetic sensor

Abstract

The invention discloses an earthquake electromagnetic disturbance observation system and an observation method based on an induction type magnetic sensor. The wide-band induction type magnetic sensoris used in the field of geophysical exploration and the like, and is difficult to directly apply to observations of the seismic electromagnetic disturbance. The system comprises a data acquisition module and an induction type magnetic sensor; the core of the data acquisition module adopts the NI data acquisition platform; the inductive magnetic sensor comprises a magnetic coil module and a circuitmodule; the magnetic coil module converts the seismic electromagnetic disturbance signal into a voltage signal, and then performs pre-amplification, filtering processing and post-stage amplificationthrough the circuit module, and transmits the seismic electromagnetic disturbance signal to the computer through the NI data acquisition platform. According to the characteristic of the frequency bandof the seismic electromagnetic disturbance signal, the earthquake electromagnetic disturbance observation system and observation method based on induction type magnetic sensor designs the magnetic coil module and the circuit module of the inductive magnetic sensor, converts the seismic electromagnetic disturbance signal into a voltage signal, and collects and processes the data through the NI data acquisition platform to obtain the low noise. The high-sensitivity signal output is suitable for the observation of the electromagnetic disturbance of the earthquake.

Description

technical field [0001] The invention belongs to the field of seismic electromagnetic disturbance observation, in particular to a seismic electromagnetic disturbance observation system and observation method based on an inductive magnetic sensor. Background technique [0002] my country's earthquake electromagnetic disturbance observation work started after the Tangshan earthquake in 1976. After decades of research and development, it has become a means of monitoring short-term anomalies of earthquake precursors. The observation frequency bands are mainly very low frequency (VLF) and ultra-low frequency (ULF) ), the frequency band ranges from 0.1 Hz to 10 Hz, and the change of the surface magnetic field intensity with time within this frequency band at the observation site is studied. [0003] The inductive magnetic sensor is a sensor that uses Faraday's law of electromagnetic induction to measure the change of the magnetic field. It is one of the core components of electromag...

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Problems solved by technology

However, broadband inductive magnetic sensors are mostly used in geophysical prospecting and other fields, and it is difficult to directly apply them to the observation of seismic electromagnetic disturbances.

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