Self-adaptive compensation fluxgate sensor

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

Active Publication Date: 2020-11-03
JILIN UNIV
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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

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  • Self-adaptive compensation fluxgate sensor

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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 a self-adaptive compensation fluxgate sensor which is composed of an excitation circuit, a sensitive element, a detection circuit, a feedback circuit, a microcontroller and amagnetic field compensation circuit. The microcontroller executes a corresponding self-adaptive control algorithm and combines a corresponding electronic circuit and a compensation coil to achieve real-time automatic compensation of a changing magnetic field, and compensation operation is performed on an original measured magnetic field signal, so that the index requirement on an A/D chip is reduced, and the problem that a large dynamic range and a high-resolution index are difficult to realize at the same time is solved. Under the condition of the same dynamic range and resolution index constraints, the technical scheme provided by the invention can save the effective digit of the A/D chip by 10 bits, and in addition, the invention can perform real-time adaptive compensation on the changed magnetic field without manual adjustment, thereby meeting the application requirements of long-term monitoring of the magnetic field.

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