超声多普勒测量海底渗漏气泡流速的实验研究

Experimental Study on Ultrasonic Doppler Measurement of the Velocity of Seafloor Leakage Bubbles

海底渗漏气泡流速是测量海底冷泉渗漏气体流量的主要参数。为了测量海底渗漏气泡流速,利用超声多普勒测量的原理和气泡的二次多普勒效应,提出海底渗漏气泡速度的超声多普勒测量方法。超声多普勒测量根据超声多普勒原理设计了气泡流量测量装置,通过多普勒频移算出海底渗漏气泡流速,同时用视频法测出海底渗漏气泡流速。从多普勒法和视频法的气泡速度数据t分布95%的置信水平误差可知,视频法的气泡速度数据的波动大于多普勒法的气泡速度数据的波动,表明了超声多普勒测量海底渗漏气泡流速的有效性和准确性,优于视频法测量海底渗漏气泡流速。

The velocity of seafloor leakage bubbles is an important parameter to measure the gas flow from seafloor cold spring leakage. In order to measure the velocity of seafloor leakage bubbles, an ultrasonic Doppler measurement method is proposed in this paper using the principle of ultrasonic DoppXer measurement and secondary Doppler effect. In accordance with the principles of ultrasonic Doppler measurement, a device is designed for measuring bubble flow, so as to calculate the velocity of seafloor leakage bubbles through Doppler frequency shift. Meanwhile, the velocity of leakage bubbles is also measured by the video method. From the confidence level error of 95% t distribution of bubble velocity data form the Doppler and video methods, it can be concluded that the fluctuation of bubble velocity data from the video method is larger than that from the Doppler method, proving the effectiveness and accuracy of ultrasonic Doppler measurement of the velocity of seafloor leakage bubbles, which is better than the method of video measuring.