浅地层剖面仪关键声学参数的检测技术研究

基于在消声水池中对参量阵型浅地层剖面仪进行的声学参数测量试验及数据的处理分析,探索性地提出了一套完整的浅地层剖面仪关键声学参数检测与评价的解决方案。方案主要包括4部分:1)检测平台构建:简述了检测平台的主要组成部分,并对消声水池的建设提出了基本的技术要求;2)声学参数测量:介绍了浅地层剖面仪的声源级、频率和脉冲长度测量的方法和操作要点;3)数据处理分析:论述了测量数据预处理的目的和方法,给出了声学参数计算的主要公式和方法;4)符合性分析:分析各声学参数实测值与标称值的符合性及偏离度。本试验发现所用的浅地层剖面仪的关键声学参数的实测值与其标称值偏离较大,即说明书给出的标称值仅是参考性数值。因此,在进行浅地层剖面仪的检测与校准工作时,应对新购仪器进行强制性首检以获取其各参数准确的初始值。

Research on Measurement Technique of Acoustic Parameters of Sub-bottom Profiler

Based on a test for measuring acoustic parameters of a parametric sub bottom profiler (SBP) in an anechoic tank and subsequent data processing and analysis, this study presented a complete exploratory solution for the measurement and evaluation of key acoustic parameters of SBP. The scheme mainly included four parts, 1) Construction of the measurement platform, which includes briefly describing main components of the platform and putting forward basic technical requirements for the construction of the anechoic tank; 2) Measurement of acoustic parameters, providing methods and operating points of the measurement of the sound source level, frequency and pulse length; 3) Data processing and analysis, which includes discussions on purposes and methods of data preprocessing and providing main formulas and methods for calculating acoustic parameters; 4) Conformity analysis, which analyzes the conformities and deviations between measured and nominal values of acoustic parameters. We suggested that the nominal values of acoustic parameters of SBP used in this test were only reference values or theoretical values. Therefore, it is important to carry out the mandatory first measurement for newly purchased instrument to obtain the initial values of the parameters.