【摘要】：地面核磁共振探測(cè)是目前世界上唯一一種直接探測(cè)地下介質(zhì)中含水體儲(chǔ)備情況的地球物理方法,與其他地球物理方法相比,具有探測(cè)效率高、探測(cè)結(jié)果定量等優(yōu)勢(shì),因而被廣泛應(yīng)用于水資源勘查、評(píng)價(jià)以及隧道/礦井突涌水等水災(zāi)害隱患監(jiān)測(cè)領(lǐng)域。然而,地面磁共振探測(cè)儀器系統(tǒng)在進(jìn)行野外探測(cè)時(shí),由于對(duì)環(huán)境中存在的電磁噪聲缺少先驗(yàn)認(rèn)知,直接的開(kāi)展探測(cè)工作,在復(fù)雜的噪聲環(huán)境下可能會(huì)導(dǎo)致即使經(jīng)過(guò)數(shù)據(jù)后處理依然無(wú)法實(shí)現(xiàn)磁共振信號(hào)的有效提取,從而浪費(fèi)了大量人力物力資源。針對(duì)這一問(wèn)題,本文提出開(kāi)展基于磁共振測(cè)量的空間電磁噪聲采集系統(tǒng)的研制,并通過(guò)對(duì)該系統(tǒng)獲取的噪聲數(shù)據(jù)進(jìn)行分析,給出探測(cè)區(qū)域是否具備開(kāi)展磁共振測(cè)量的必要性評(píng)價(jià),課題研究具有重要的實(shí)際應(yīng)用價(jià)值。首先,在查閱大量文獻(xiàn)資料的基礎(chǔ)上,通過(guò)分析磁共振環(huán)境噪聲的特點(diǎn),設(shè)計(jì)并實(shí)現(xiàn)了以MSP430為主控系統(tǒng)的磁共振空間電磁噪聲采集系統(tǒng)。考慮到野外探測(cè)的便攜性和穩(wěn)定性,提出了基于PCB板的傳感器設(shè)計(jì)方案;為了實(shí)現(xiàn)磁共振信號(hào)1kHz-3kHz頻帶內(nèi)高動(dòng)態(tài)范圍的噪聲采集,通過(guò)對(duì)接收線(xiàn)圈匹配網(wǎng)絡(luò)傳遞函數(shù)的分析,進(jìn)行了匹配電路和調(diào)理電路的設(shè)計(jì);此外,系統(tǒng)還具有GPS定位實(shí)驗(yàn)區(qū)域和實(shí)時(shí)存儲(chǔ)數(shù)據(jù)的功能。然后,本文提出了以特征參數(shù)擬合誤差為基準(zhǔn)開(kāi)展空間電磁噪聲等級(jí)劃分方法研究,通過(guò)對(duì)不同含水量條件下含噪MRS信號(hào)的仿真處理,實(shí)現(xiàn)了不同噪聲環(huán)境下對(duì)環(huán)境電磁噪聲水平的三級(jí)有效劃分,為實(shí)際應(yīng)用提供了理論指導(dǎo)。最后,開(kāi)展了噪聲采集裝置的室內(nèi)外測(cè)試實(shí)驗(yàn),通過(guò)對(duì)不同環(huán)境下的噪聲測(cè)試,驗(yàn)證了所設(shè)計(jì)的噪聲采集系統(tǒng)的性能;同時(shí),通過(guò)對(duì)探測(cè)空間所測(cè)到的環(huán)境電磁噪聲的分析評(píng)價(jià)以及與實(shí)際探測(cè)工作結(jié)果的對(duì)比,驗(yàn)證了本文提出的噪聲等級(jí)評(píng)估方法的有效性。
[Abstract]:Surface nuclear magnetic resonance (NMR) detection is the only geophysical method in the world to directly detect water reserves in underground media. Compared with other geophysical methods, it has the advantages of high detection efficiency and quantitative detection results. Therefore, it is widely used in the fields of water resources exploration, evaluation and monitoring of water hazards such as tunnel / mine flooding. However, when the ground magnetic resonance detection instrument system carries out field exploration, due to the lack of a prior understanding of the electromagnetic noise existing in the environment, the detection work is carried out directly. In complex noise environment, even after data processing, magnetic resonance signal can not be extracted effectively, thus wasting a lot of human and material resources. To solve this problem, this paper proposes to develop a spatial electromagnetic noise acquisition system based on magnetic resonance measurement, and analyzes the noise data obtained by the system. The evaluation of the necessity of magnetic resonance measurement in the detection area is given, and the research is of great practical value. Firstly, a magnetic resonance spatial electromagnetic noise acquisition system with MSP430 as the main control system is designed and implemented by analyzing the characteristics of magnetic resonance ambient noise based on a large amount of literature. Considering the portability and stability of field detection, the sensor design scheme based on PCB board is proposed, and in order to realize the noise acquisition in high dynamic range of magnetic resonance signal (1kHz-3kHz) band, the transfer function of receiving coil matching network is analyzed. The matching circuit and conditioning circuit are designed, in addition, the system also has the function of locating the experimental area of GPS and storing data in real time. Then, based on the fitting error of characteristic parameters, the method of classification of spatial electromagnetic noise is proposed, and the simulation of noisy MRS signal under different water content is carried out. The three-level effective division of electromagnetic noise level in different noise environment is realized, which provides theoretical guidance for practical application. Finally, the indoor and outdoor testing experiments of noise acquisition device are carried out, and the performance of the designed noise acquisition system is verified by the noise test in different environments. The effectiveness of the proposed method is verified by the analysis and evaluation of the environmental electromagnetic noise measured in the detection space and the comparison with the actual detection results.
【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)】：P641.7;P631

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