本文選題：磁梯度張量　切入點(diǎn)：同步采集　出處：《吉林大學(xué)》2017年碩士論文

【摘要】：隨著科學(xué)進(jìn)步和發(fā)展,磁力勘探探測(cè)技術(shù)在礦產(chǎn)勘探、軍事探潛以及未爆炸物檢測(cè)等領(lǐng)域有著廣泛應(yīng)用。與傳統(tǒng)的磁力勘探相比,磁梯度張量測(cè)量具有其特有的突出異常場(chǎng)弱化背景場(chǎng)等優(yōu)點(diǎn)。全張量磁梯度測(cè)量技術(shù)主要測(cè)量磁矢量的三個(gè)分量在地理坐標(biāo)系三個(gè)方向上的空間變化率,但由于磁梯度傳感器的兩個(gè)拾取環(huán)在測(cè)量過(guò)程中對(duì)共模磁場(chǎng)的抑制能力有限,從而在目標(biāo)(梯度)信號(hào)中引入共模噪聲。通常情況下,需要一個(gè)三軸的超導(dǎo)量子干涉器(Superconducting Quantum Interference Device,SQUID)對(duì)6個(gè)平面梯度計(jì)進(jìn)行不平衡度修正來(lái)消除該共模噪聲。針對(duì)這一問(wèn)題,本文設(shè)計(jì)了基于現(xiàn)場(chǎng)可編程門(mén)陣列(Field-Programmable Gate Array,FPGA)的八通道同步采集電路,并利用并行連接方式,實(shí)現(xiàn)了九路信號(hào)的同步采集,并通過(guò)九路信號(hào)的同步性實(shí)驗(yàn)和全張量信號(hào)采集實(shí)驗(yàn)驗(yàn)證了方案的可行性和可靠性。本文具體的研究?jī)?nèi)容有:(1)研究了全張量磁梯度測(cè)量原理,在此基礎(chǔ)上針對(duì)磁梯度張量測(cè)量的測(cè)量對(duì)象,設(shè)計(jì)了信號(hào)采集電路的整體方案。根據(jù)總體設(shè)計(jì)方案,研制了全張量磁梯度信號(hào)同步采集電路,主要包括電源模塊、放大電路模塊、A/D轉(zhuǎn)換模塊、FPGA控制模塊、數(shù)據(jù)儲(chǔ)存模塊及與上位機(jī)通訊模塊,實(shí)現(xiàn)了對(duì)九路模擬信號(hào)同步進(jìn)行采集、放大、轉(zhuǎn)換、傳輸?shù)裙δ堋?2)開(kāi)發(fā)了上位機(jī)控制程序。設(shè)置了上位機(jī)與通訊模塊的傳輸方式、數(shù)據(jù)的儲(chǔ)存格式和輸出形式,編寫(xiě)了數(shù)字濾波、電壓轉(zhuǎn)換及信號(hào)輸出電壓與磁場(chǎng)梯度的轉(zhuǎn)換等程序,實(shí)現(xiàn)了數(shù)據(jù)傳輸、存儲(chǔ)、分析、顯示等功能。(3)開(kāi)展室內(nèi)實(shí)驗(yàn),對(duì)全張量磁梯度信號(hào)同步采集電路進(jìn)行了性能參數(shù)測(cè)試與可行性驗(yàn)證實(shí)驗(yàn)。獲得了電路的靜噪水平,實(shí)驗(yàn)表明設(shè)計(jì)的采集電路可以實(shí)現(xiàn)全張量9路SQUID測(cè)量通道的同步采集。
[Abstract]:With the progress and development of science, magnetic exploration technology has been widely used in the fields of mineral exploration, military submarine exploration and non-explosive detection. The magnetic gradient Zhang Liang measurement has its unique advantages such as prominent anomalous field weakening background field and so on. The magnetic gradient measurement technique mainly measures the spatial change rate of three components of magnetic vector in three directions of geographical coordinate system. However, due to the limited ability of the two pickup rings of the magnetic gradient sensor to suppress the common-mode magnetic field in the measurement process, common-mode noise is introduced into the target (gradient) signal. In order to eliminate the common-mode noise, a three-axis superconducting Quantum Interference device squid is needed to correct the unbalance of six planar gradiometers. In this paper, an eight-channel synchronous acquisition circuit based on Field-Programmable Gate FPGA (Field Programmable Gate Array) is designed. The feasibility and reliability of the scheme are verified by the synchronous experiment of nine signals and the experiment of collecting all Zhang Liang signals. On this basis, the whole scheme of signal acquisition circuit is designed for the measuring object of magnetic gradient Zhang Liang. According to the overall design scheme, the synchronous acquisition circuit of all Zhang Liang magnetic gradient signal is developed, which mainly includes the power supply module. Amplifier circuit module A / D conversion module FPGA control module, data storage module and communication module with host computer to realize the acquisition, amplification, conversion of nine analog signals synchronously. The control program of upper computer is developed. The transmission mode between upper computer and communication module, the storage format and output form of data are set up, and the digital filter is compiled. Programs such as voltage conversion and signal output voltage conversion with magnetic field gradient have realized data transmission, storage, analysis, display and other functions. The performance parameter test and feasibility verification experiment of the synchronous acquisition circuit of all Zhang Liang magnetic gradient signal are carried out, and the static noise level of the circuit is obtained. The experiment shows that the designed acquisition circuit can realize synchronous acquisition of 9 channels of SQUID measurement channel.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM936

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張笑彰;凌振寶;申茂冬;王中e，

本文編號(hào)：1699249