• 责任者：Zhang Qisheng (School of Geophysics and Information Technology ; China University of Geosciences ; Beijing 100083 ; China) ; Deng Ming
• 刊名：Chinese Journal of Geophysics
• 出版年：2013
• 卷期：56(11)
• 关键词：电法勘探 ; electrical exploration ; 海洋物探 ; marine geophysical exploration ; 仪器 ; instruments
• 页码：p.3699-3707
• 图表：7 illus., 24 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

     This paper analyzes the development of the expendable current profiler, presents briefly the basic principles of the ocean current induced electric field, and proposes a technical solution for the expendable current profiler. The XCP ocean current electric field sensor is developed according to the actual requirements of the expendable current profiler. During descending of the XCP probe, it will rotate at the speed of 16 r/s, and is driven by the rotation blade, so as to modulate the ocean current electric field signal using AM approach and move it into the ultra-low-noise frequency range of the sensor. In this way, the weak ocean current electric field signal could be rapidly processing circuit on top of the supplementary for the homonymous measured under the high noise background. XCP probe is designed tO realize the component of the ocean current electric fie The weak signal hardware circuit ld while filtering the weak signal of the ocean current electric field, and eliminate the strong interference of the induced electric field produced from the descending of the XCP probe. The SoPC technology is adopted in the XCP probe research in order to measure and digitally process ocean current electric field signals, coil signals and temperature information, and send the digital information to the XCP float through the UART protocol and the LVDS physical layer transmission method. The dynamic data transmission technology with the 2 km long, 0.1 mm diameter varnished wire is developed, and the digital data transmission between the XCP probe and the XCP float is realized. The XCP ocean current data processing methods are researched based on the ocean current electric field signals collected by the XCP probe and the in-phase component I,,, quadrature component Q~ and the baseline B,,, so as to calculate the eastward and northward relative speed components, VEt and VNr, of the ocean current. The XCP ocean current electric field information and the ocean temperature information at the depth of 1000 m of the South China Sea have been collected for the first time with the XCP developed in this work.