考虑声波折射补偿的海底热液口声学原位测温方法

介绍了海底热液口温度场原位声学测量方法,进行了海底非均匀温度场中声波折射传播路径研究,并建立了声波传播路径的数学模型,利用COMSOLMultiphysics软件进行了声波传播路径的数值求解.在云南省龙陵县境内的茄子上水库的湖底热泉进行了实验研究,准确地还原出温度场.考虑了声波折射补偿,提高了声波飞渡时间估计精度,并对声波路径弯曲补偿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:对声波信号传播路径由曲线变直线进行补偿,可提高温度场原位测量的精确性.

Study on the acoustic in situ measurement techniques for determining temperature field around seafloor hydrothermal vents taking into account the refraction compensation of sound waves

This paper presents the basis of acoustic method used for temperature field measurement of seafloor hydrothermal vents.Study on the refracted propagation path of sonic waves in seafloor non-uniform temperature field with Fermat's theory and by variational calculation,and is numerically calculated in the model's temperature field.Experimental research is performed to exactly rebuild the temperature fields around hot springs on floor of Lake Qiezishan,Yunnan.The accuracy of time of flight estimation has been improved based on the technique of bending compensation of propagation paths of acoustic signal.At the same time,by comparison with two temperature fields,the max absolute error,the max relative error and the root mean square error are given.It shows that the bending compensation of propagation paths of acoustic signal technique can be applied to temperature field measurement detector around seafloor hydrothermal vents.It also has a good accuracy.