本文選題：電磁探測 + 水下電磁場　； 參考：《電子科技大學》2015年碩士論文

【摘要】：隨著海洋資源開發(fā)利用逐步成為國家重點發(fā)展領(lǐng)域,水下金屬物體,如航行器、金銀、貴重金屬的探測技術(shù)也快速發(fā)展。對于沉埋在水底的金屬物體,常規(guī)的探測手段如圖像聲納等,難以有效進行探測,而采用電磁探測手段對于沉埋的金屬物體能夠取得較好的探測效果。本文對水下金屬物體電磁反射特性進行了研究,為水下金屬物體電磁探測提供了理論和實驗依據(jù)。本論文對水下金屬物體電磁反射特性進行了理論分析與實驗研究,首先對水下磁探測的發(fā)展和國內(nèi)外現(xiàn)狀進行了介紹,給出了金屬物體對磁偶極子輻射場的電磁反射原理,對磁偶極子輻射源的空間分布和水下衰減進行了理論分析與仿真計算,根據(jù)金屬物體電磁反射場的特點,設計了電磁反射場檢測傳感器的布局方式,并設計了適用于水下主動電磁探測的發(fā)射線圈和發(fā)射電路,選擇了適宜頻段的電磁傳感器,搭建了數(shù)據(jù)采集系統(tǒng),并編寫了數(shù)據(jù)采集分析軟件等,針對水下電磁反射信號的特點,論文提出了水下金屬物體電磁反射信號的小波降噪方法、幅度包絡檢測方法、瞬時特征提取方法及發(fā)射線圈等效阻抗計算方法,并給出了通過電磁反射場幅度變化和發(fā)射線圈等效阻抗變化情況判斷金屬物體類型的一些依據(jù),最后使用鋁和鐵兩種材質(zhì)的金屬物體進行了淡水中的電磁反射特性實驗,對電磁反射場和發(fā)射線圈等效阻抗進行了信號采集與分析,驗證了電磁反射的檢測方法、信號處理方法及特征提取方法,在一定條件下實現(xiàn)了金屬物體判斷及金屬類型區(qū)分。
[Abstract]:With the development and utilization of marine resources, the exploration technology of underwater metal objects, such as navigators, gold and silver, and precious metals, has gradually become a key area of national development. Conventional detection methods such as image sonar are difficult to detect metal objects buried on the bottom of water, but the electromagnetic detection method can obtain better detection effect for buried metal objects. In this paper, the electromagnetic reflection characteristics of underwater metal objects are studied, which provides a theoretical and experimental basis for the electromagnetic detection of underwater metal objects. In this paper, the electromagnetic reflection characteristics of underwater metal objects are theoretically analyzed and experimentally studied. Firstly, the development of underwater magnetic detection and the present situation at home and abroad are introduced, and the electromagnetic reflection principle of metal objects to magnetic dipole radiation field is given. The spatial distribution and underwater attenuation of magnetic dipole radiation source are theoretically analyzed and simulated. According to the characteristics of electromagnetic reflectance field of metal object, the layout mode of electromagnetic reflection field detection sensor is designed. The launching coil and transmitting circuit suitable for underwater active electromagnetic detection are designed. The electromagnetic sensor with suitable frequency band is selected, the data acquisition system is built, and the software for data acquisition and analysis is compiled. According to the characteristics of underwater electromagnetic reflection signal, wavelet denoising method, amplitude envelope detection method, instantaneous feature extraction method and equivalent impedance calculation method of transmitting coil are proposed in this paper. Some evidences for judging the type of metal objects are given by the variation of electromagnetic reflectance field amplitude and equivalent impedance of the emitter coil. Finally, the electromagnetic reflection characteristics of metal objects of aluminum and iron are tested in fresh water. The signal acquisition and analysis of the electromagnetic reflectance field and the equivalent impedance of the transmitting coil are carried out to verify the detection method, the signal processing method and the feature extraction method of the electromagnetic reflection. Under certain conditions, the judgment of the metal object and the classification of the metal type are realized.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P715.5

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本文編號：2050342