Active field compensation type digital ultralow frequency electromagnetic sensor

Abstract

The invention discloses an active field compensation type digital ultralow frequency electromagnetic sensor, consisting of a sensor seal head, an SD card groove, a collection instrument cabin, a cushion block, an induction coil group, a sensor housing, a sensor shielding layer, and a magnetic core rod support. The invention utilizes a high performance CPU as a main controller, realizes the high accuracy data collection under a condition of low frequency and weak signal and stores the collected data into the SD card. The CPU starts up the active compensation system according to the real-time measurement temperature and vibration data in the data collection process, performs real-time automatic compensation on the collected signal, and effectively overcomes the affect on the test data due to the environment temperature and vibration. The invention has advantages of compensating the capability width and digitalized output.

Description

technical field [0001] The invention relates to an electromagnetic sensor used in the magnetotelluric sounding (MT) method, especially an active field compensation system is set in the sensor, which can realize automatic compensation for the influence of temperature and vibration on the performance of the electromagnetic sensor. There is a high-precision broadband data acquisition system, which converts the analog signal received by the electromagnetic sensor into a digital signal. Background technique: [0002] With the development of earth science and the increasing demand of human beings for resources, it is the main task of contemporary earth science to conduct deep exploration of the earth to study the mysteries of continental evolution, find more resources, and protect the environment. Geophysical observation is an important method and technology for deep exploration of the earth, among which magnetotelluric sounding (MT) is the main geophysical method for studying the...

AI Technical Summary

Problems solved by technology

During the acquisition process, the magnetic core material, induction coil and amplifier circuit inside the electromagnetic sensor are easily affected by the external environment temperature, vibration, etc., resulting in changes in the performance of the electromagnetic sensor, resulting in large errors in the measured electromagnetic field amplitude and phase.

This kind of measurement error due to the change of the performance of the electromagnetic sensor cannot be eliminated by digital processing technology.

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