文章摘要
王斌贤,冯海泓,黄敏燕,胡波,杨永.基于参量阵双通道信息的富钴结壳高精度测厚算法[J].声学技术,2021,40(4):464~469
基于参量阵双通道信息的富钴结壳高精度测厚算法
Thickness measurement method of Cobalt-Rich Manganese Crusts based on dual-channel information of parametric array
投稿时间:2020-05-19  修订日期:2020-06-20
DOI:10.16300/j.cnki.1000-3630.2021.04.004
中文关键词: 参量阵  富钴结壳  希尔伯特变换  自相关算法
英文关键词: acoustic parametric array  Cobalt-rich Manganese Crusts (CRCs)  Hilbert transform  autocorrelation method
基金项目:国家自然科学基金青年科学基金(61801471)、中国大洋矿产资源开发协会资源环境类课题(DY135-C1-1-08)。
作者单位E-mail
王斌贤 中国科学院声学研究所东海研究站, 上海 201815
中国科学院大学, 北京 100190 
 
冯海泓 中国科学院声学研究所东海研究站, 上海 201815 fhh@mail.ioa.ac.cn 
黄敏燕 中国科学院声学研究所东海研究站, 上海 201815  
胡波 中国地质调查局广州海洋地质调查局, 广东广州 510075  
杨永 中国地质调查局广州海洋地质调查局, 广东广州 510075  
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中文摘要:
      富钴结壳作为一种重要的海底矿产资源,在工业生产中有着重要应用,具有潜在的开采价值,富钴结壳的厚度是评估开采矿区资源量的重要指标。论文基于原位参量探测器测量富钴结壳厚度,探测器向结壳垂直发射调制信号,并接收返回的原频、差频双通道回波信号,分别提取两个回波信号的包络,然后提取回波信号峰值点的到达时刻,采用时延差法测量结壳厚度。回波到达时刻的提取是影响测厚精度的关键因素,传统的包络提取方法如希尔伯特变换,可以准确地提取出原频信号的包络,但对差频信号的提取精度较差。因此,通过希尔伯特变换与自相关算法分别提取原频信号与差频信号包络,提高了测厚的精度。通过水池试验分析了该算法的测厚性能,随后将该算法应用于中国大洋某航次的富钴结壳海试数据,验证了该算法的可行性。
英文摘要:
      Cobalt-Rich Manganese Crusts (CRCs) is one of the important submarine mineral resources and has important application in the industry, so the exploitation of CRCs has potential mining value. The thickness of CRCs is an important index to evaluate the amount of resource in mining areas. In this paper, the prototype parametric acoustic probe is developed for in-situ measurement of CRCs thickness. The prototype transmits primary signals vertically to undersea sediment and receives the dual-channel echo signals of primary and difference frequencies. The envelopes of the primary signal and difference signal are extracted respectively to get the arrival time of the peak point of echo signal, and then the “time delay difference” method is used for the thickness measurement. The extraction of echo arrival time is the key factor of the measurement. Traditional methods of envelope extraction, such as Hilbert transform can precisely extract the envelope of the primary echo, but the extraction accuracy of the envelope of the difference frequency signal is poor. In this paper, the envelopes of the primary signal and difference signal are extracted by Hilbert transform and autocorrelation algorithm respectively, which improves the accuracy of thickness measurement. The pool test is conducted to analyze the performance of the algorithm. The sea trial result in a China voyage shows the effectiveness of the algorithm.
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