本文選題：混合物 + 介電常數(shù)�。� 參考：《長安大學》2015年碩士論文

【摘要】：混合物介電特性是研究其物理學特征、測定其成分的基礎,對環(huán)境污染監(jiān)測、建筑物穩(wěn)定性及道路性能評估等領(lǐng)域意義重大。但受到理論方法、研究手段等因素限制,對土壤、巖石等混合介質(zhì)電學特性的計算和測量問題至今未能形成一套完整成熟的理論體系和有效的研究方法。土壤的含水量測量問題在地質(zhì)學、土壤學研究等領(lǐng)域也都具有重要應用意義,但目前用于測量土壤含水量參數(shù)的各種方法在精度、適用性、環(huán)保等方面尚有局限性。本研究工作利用超寬帶電磁窄脈沖技術(shù)來研究巖石、土壤等混合介質(zhì)的介電常數(shù)特性,并將此方法應用于測量土壤含水量參數(shù)。這種超寬帶電磁脈沖測量方法利用超寬帶電磁脈沖信號來獲得介質(zhì)的時域介電響應以及在超寬頻譜內(nèi)的連續(xù)介電響應曲線,闡明土壤介電特性在連續(xù)譜內(nèi)的變化特性,及其與樣本成分、結(jié)構(gòu)、飽和度、溫度等因素之間的動態(tài)關(guān)系。通過對時、頻域介電響應的聯(lián)合反演分析獲得準確度較高的含水量參數(shù)。并采用數(shù)值模擬與實驗測量相結(jié)合的方法來驗證此測量方法的有效性及可行性。設計并實現(xiàn)超寬帶脈沖收發(fā)天線系統(tǒng),開展土壤介電模型在復雜因素影響下對納秒級脈沖信號的介電響應實驗研究,建立及完善超寬帶介電反演算法以計算土壤含水含鹽量等物理參數(shù)。本項目對于深入了解物質(zhì)介電特性及含水量等參數(shù)對超寬帶電磁脈沖的響應規(guī)律,發(fā)展新型的含水量測量方法,具有重要的科學意義和應用價值,其研究成果可推廣于土壤或路基含水量測量等工程應用。
[Abstract]:The dielectric properties of mixtures are the basis for studying their physical characteristics and determining their components. They are of great significance in the field of environmental pollution monitoring, building stability and road performance evaluation. However, due to the limitations of theoretical methods and research methods, the calculation and measurement of electrical properties of mixed media such as soil and rock have not yet formed a complete and mature theoretical system and effective research methods. The measurement of soil water content is also of great significance in the fields of geology and soil science, but there are still some limitations in the precision, applicability and environmental protection of various methods used to measure soil water content parameters at present. In this study, the dielectric constant of rock, soil and other mixed media was studied by using ultra-wideband electromagnetic narrow pulse technique, and the method was applied to measure soil water content parameters. The UWB electromagnetic pulse measurement method uses UWB electromagnetic pulse signal to obtain the dielectric response in time domain and the continuous dielectric response curve in the ultra wide spectrum. The variation characteristics of soil dielectric characteristics in the continuous spectrum are clarified. And its dynamic relationship with sample composition, structure, saturation, temperature and other factors. The water content parameters with high accuracy are obtained by the joint inversion analysis of the dielectric response in the frequency domain. The method of numerical simulation and experimental measurement is used to verify the validity and feasibility of this method. An ultra-wideband pulse transceiver antenna system is designed and implemented. The dielectric response of soil dielectric model to nanosecond pulse signal is studied under the influence of complex factors. To establish and perfect the ultra-wideband dielectric inversion algorithm to calculate the soil water and salt content and other physical parameters. This project has important scientific significance and application value for deeply understanding the response law of material dielectric characteristics and water content and other parameters to UWB electromagnetic pulse, and developing a new measuring method of water content. The research results can be extended to soil or subgrade moisture measurement and other engineering applications.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S152

【共引文獻】

相關(guān)博士學位論文 前5條

1 吳小平;TEM中寬頻激勵源及單脈沖測深方法研究[D];中南大學;2010年

2 劉廣東;乳腺癌檢測的時域微波成像算法研究[D];南京郵電大學;2011年

3 陳曙東;直升機瞬變電磁系統(tǒng)響應計算與地回線標定[D];吉林大學;2012年

4 席新明;基于介電特性的流體組分檢測方法與技術(shù)研究[D];西北農(nóng)林科技大學;2012年

5 萬玲;地下水磁共振與瞬變電磁聯(lián)合反演方法及探測系統(tǒng)研究[D];吉林大學;2013年

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本文編號：1893172