海底热液口温度场高精度声学测量方法研究

Study on high precision acoustic measurement techniques for determining temperature fields around seafloor hydrothermal vents

介绍了海底热液口温度场原位声学测量的基本原理、总体最小二乘重建方法和抛物插值算法。在云南省龙陵县茄子山水库进行湖底试验研究,基于总体最小二乘重建方法准确地还原出湖底热泉的温度场原位分布;将抛物插值算法应用于声波飞渡时间延时估计,并对抛物插值前后重建出的温度场进行最大绝对误差、最大相对误差和均方根误差分析。实验表明:总体最小二乘重建方法和抛物插值算法可用于海底热液口温度场的原位测量,且重建精度比较高。

This paper presents the basic principle of the acoustic method used for temperature field measurement of seafloor hydrothermal vents,which includes total least-squares algorithm and parabolic interpolation technique.Experiment research was performed to exactly rebuild the temperature fields around the hot springs on the floor of Lake Qiezishan,Yunnan.The accuracy of time of flight estimation has been improved based on the parabolic interpolation technique.At the same time,through comparing the two temperature fields obtained before and after parabolic interpolation,the max absolute error,the max relative error and the root mean square error are given.Experiment result shows that the total least-squares algorithm and the parabolic interpolation technique can be applied to temperature field measurement detection around seafloor hydrothermal vents,and good reconstruction accuracy is achieved.