Active field compensation digital ultra-low frequency electromagnetic sensor

A sensor and compensation technology, applied in the field of electromagnetic sensors, can solve the problems of no way to use digital processing technology, electromagnetic sensor performance changes, large electromagnetic field amplitude and phase, etc., to achieve high local test accuracy, overcome influence, and frequency band range wide effect

Active Publication Date: 2017-11-10
JILIN UNIV +2
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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.

Method used

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  • Active field compensation digital ultra-low frequency electromagnetic sensor
  • Active field compensation digital ultra-low frequency electromagnetic sensor

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Embodiment approach

[0025] Utilize the SD card 26 to import calibration work parameter tables such as calibration frequency and amplitude into the CPU main processing 24, and the CPU controls the 16Bit A / D module 12 according to its predetermined frequency and amplitude according to the number of calibration frequency points in the calibration parameters to create a The calibrated analog signal sequence is amplified by the calibration amplifier 11 and enters into the calibration coil 10 to establish an alternating magnetic field sequence for calibration inside the electromagnetic sensor.

[0026] The CPU main processor 24 starts the data acquisition system, uses the main induction coil to receive the induction signal generated by the calibration electromagnetic field, and converts the collected signal into a data signal through the amplification processing of the high-precision amplifier 14 and the analog-to-digital conversion of the 24Bit A / D module 15 , stored in the SD card in real time after b...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/12G01V13/00
CPCG01V3/12G01V13/00
Inventor 张晓培牛建军翟松涛杜立志邱建慧
Owner JILIN UNIV
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