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

【摘要】：隨著科學進步和發(fā)展,磁力勘探探測技術在礦產勘探、軍事探潛以及未爆炸物檢測等領域有著廣泛應用。與傳統(tǒng)的磁力勘探相比,磁梯度張量測量具有其特有的突出異常場弱化背景場等優(yōu)點。全張量磁梯度測量技術主要測量磁矢量的三個分量在地理坐標系三個方向上的空間變化率,但由于磁梯度傳感器的兩個拾取環(huán)在測量過程中對共模磁場的抑制能力有限,從而在目標(梯度)信號中引入共模噪聲。通常情況下,需要一個三軸的超導量子干涉器(Superconducting Quantum Interference Device,SQUID)對6個平面梯度計進行不平衡度修正來消除該共模噪聲。針對這一問題,本文設計了基于現(xiàn)場可編程門陣列(Field-Programmable Gate Array,FPGA)的八通道同步采集電路,并利用并行連接方式,實現(xiàn)了九路信號的同步采集,并通過九路信號的同步性實驗和全張量信號采集實驗驗證了方案的可行性和可靠性。本文具體的研究內容有:(1)研究了全張量磁梯度測量原理,在此基礎上針對磁梯度張量測量的測量對象,設計了信號采集電路的整體方案。根據(jù)總體設計方案,研制了全張量磁梯度信號同步采集電路,主要包括電源模塊、放大電路模塊、A/D轉換模塊、FPGA控制模塊、數(shù)據(jù)儲存模塊及與上位機通訊模塊,實現(xiàn)了對九路模擬信號同步進行采集、放大、轉換、傳輸?shù)裙δ堋?2)開發(fā)了上位機控制程序。設置了上位機與通訊模塊的傳輸方式、數(shù)據(jù)的儲存格式和輸出形式,編寫了數(shù)字濾波、電壓轉換及信號輸出電壓與磁場梯度的轉換等程序,實現(xiàn)了數(shù)據(jù)傳輸、存儲、分析、顯示等功能。(3)開展室內實驗,對全張量磁梯度信號同步采集電路進行了性能參數(shù)測試與可行性驗證實驗。獲得了電路的靜噪水平,實驗表明設計的采集電路可以實現(xiàn)全張量9路SQUID測量通道的同步采集。
[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.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM936

【參考文獻】

相關期刊論文 前10條

1 張笑彰;凌振寶;申茂冬;王中e，

本文編號：1699249