文章摘要
伍智林,邹大鹏,孙晗,刘伟,肖体兵.海底沉积物岩芯横向声学测量系统的标定[J].声学技术,2023,42(4):462~467
海底沉积物岩芯横向声学测量系统的标定
Calibration of the crosswise acoustic measurement sysem of marine sediment cores
投稿时间:2021-12-13  修订日期:2022-02-26
DOI:10.16300/j.cnki.1000-3630.2023.04.008
中文关键词: 海底沉积物  横向测量  声速  声衰减  等效换能器
英文关键词: marine sediments  crosswise measurement  sound velocity  sound attenuation  equivalent transducer
基金项目:国家自然科学基金(41976180、41776043);声场声信息国家重点实验室开放基金(SKLA202105)。
作者单位E-mail
伍智林 广东工业大学, 机电工程学院, 广东广州 510006  
邹大鹏 广东工业大学, 机电工程学院, 广东广州 510006
广东工业大学, 省部共建精密电子制造技术与装备国家重点实验室, 广东广州 510006
中国科学院声学研究所, 声场声信息国家重点实验室, 北京 100190 
anthonyzou@126.com。 
孙晗 广东工业大学, 机电工程学院, 广东广州 510006  
刘伟 广东工业大学, 机电工程学院, 广东广州 510006
中国科学院声学研究所, 声场声信息国家重点实验室, 北京 100190 
 
肖体兵 广东工业大学, 机电工程学院, 广东广州 510006  
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中文摘要:
      水平轴向测量技术相对成熟,但较难获取海底沉积物的无扰动分层声学特性,采用横向测量技术可以解决这一问题。文章研究了海底沉积物岩芯横向测量技术,将水作为海底沉积物测量的参考标准,进行测量系统的标定。提出了等效换能器的概念,将样品以外的声传播介质整合成等效换能器的一部分,标定测量等效换能器声延时和声传播初始能量。以水为标准介质,分别采用33、80、100 kHz三种频率的声学换能器,以及75、90、110 mm三种管径的聚氯乙烯(Polyvinyl Chloride,PVC),测量所得的水中的声速与标准计算水中的声速具有一致性,其中以采用80 kHz频率声学换能器和90 mm管径PVC管测量时的声速误差最小,选用此状态进行标定,得出当隔水耦合测量法换能器相对距离为142.02 mm时,标定的等效换能器声延时为45.88±0.08 μs,等效换能器声传播初始能量(以接收换能器的接收电压表示)为0.86±0.03 V。应用标定的等效换能器声延时和声传播初始能量测量海底沉积物。计算得到声速和声衰减系数符合黏土质粉砂的声学特性。
英文摘要:
      The relatively mature horizontal axial measurement technique is difficult to obtain the non-disturbing layered acoustic properties of marine sediment samples in laboratory. The crosswise measurement technology can solve this problem. The research on this measurement technique is carried out by using water as the reference standard for seabed sediment measurement to calibrate the measurement system. The concept of equivalent transducer is proposed, the sound propagation medium other than the sample is integrated into a part of the equivalent transducer, the sound delay of the equivalent transducer is calibrated and the initial energy of sound propagation is measured. By taking water as the standard medium and comparing calibration results in measuring the commonly used Polyvinyl chloride (PVC) pipes of 75, 90, and 110 mm diameters with three acoustic transducers of 33, 80 and 100 kHz, the measured sound velocities are consistent with the standard calculated sound velocity, in which the error of measuring 90 mm diameter PVC pipe at 80 kHz frequency is the smallest. Based on the above calibration method, it is concluded that when the relative distance between the transducer pairs in the water-proof coupling method is 142.02 mm, the calibrated sound delay of the equivalent transducer is 45.88±0.08 μs, and the initial value of the sound propagation energy represented by the receiving voltage of the receiving transducer is 0.86±0.03 V. Based on the sound delay of the equivalent transducer and the initial value of the sound propagation energy, the calculated acoustic velocity and acoustic attenuation of seabed sediments are consistent with the acoustic properties of clay silt.
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