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An Adaptive Compensation Fluxgate Sensor

A fluxgate sensor and self-adaptive compensation technology, which is applied to the magnetic field measurement and the size/direction of the magnetic field using the principle of magnetic flux control, and can solve the problem that it is difficult to meet the dual index constraints of long-term data transmission, large dynamic range and high resolution, etc. problem, to achieve the effect of ensuring reliability, reducing index requirements, reducing multiplication error and temperature coefficient

Active Publication Date: 2021-12-07
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sensor with small size, low cost, large dynamic range and high resolution to solve the problem that the existing fluxgate sensor is difficult to meet the dual index constraints of large dynamic range and high resolution in the long-line data transmission process. Adaptively Compensated Fluxgate Sensors

Method used

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  • An Adaptive Compensation Fluxgate Sensor
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  • An Adaptive Compensation Fluxgate Sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0084] The long-term continuous monitoring of the geomagnetic field at 1000m downhole requires the dynamic range of the downhole fluxgate sensor to be ±100000nT, and the resolution is better than 0.01nT.

[0085] A / D effective digit calculation formula:

[0086]

[0087] Among them, m is the effective number of digits required by A / D, V i,max The maximum input signal for the A / D chip, V i,min It is the smallest signal resolvable by the A / D chip. Bring the required index parameters into the formula, and consider the positive and negative ranges, and calculate m≥25. Under certain sampling rate conditions, the effective number of digits is more than 25 A The / D chip is more difficult to select.

[0088] Since human interference is avoided in the deep earth environment of 1000m underground, and the influence of the daily change of the geomagnetic field is considered, the short-term fluctuation of the magnetic field will not exceed 100nT. Therefore, the adaptive magnetic field...

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Abstract

The invention relates to an adaptive compensation fluxgate sensor, which is composed of an excitation circuit, a sensitive element, a detection circuit, a feedback circuit, a microcontroller and a magnetic field compensation circuit. The micro-controller executes the corresponding adaptive control algorithm, and combines the corresponding electronic circuit and the compensation coil to realize the real-time automatic compensation for the changing magnetic field. Requirements, to solve the problem that the large dynamic range and high resolution indicators are difficult to achieve at the same time. Under the constraints of the same dynamic range and resolution index, the technical solution proposed by the present invention can save 10 effective bits of the A / D chip. In addition, the present invention can perform real-time self-adaptive compensation to the changing magnetic field without manual Manual adjustment to meet the application requirements of long-term magnetic field monitoring.

Description

technical field [0001] The invention belongs to the technical field of magnetic field detection sensors, in particular to a fluxgate sensor, in particular to a fluxgate sensor with an adaptive compensation function. Background technique [0002] Fluxgate sensor is a vector sensor for measuring DC and low-frequency AC magnetic fields. The basic principle of its magnetic field measurement is Faraday's law of electromagnetic induction. The core link is that the magnetic permeability of high magnetic permeability materials changes nonlinearly under the action of an excited magnetic field. The fluxgate sensor has the characteristics of small size, light weight, vector measurement, and high reliability. It is known as the magnetic sensor with the best comprehensive performance and is used in deep well detection, satellite magnetic survey, ocean monitoring and other fields. [0003] In some application fields that require long-term data transmission, such as geological disaster mon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/04
CPCG01R33/04
Inventor 王言章石佳晴李京杰秦佳男
Owner JILIN UNIV