Abstract
Marine sediments are rich in mineral resources, organic resources, and microbial life. The study of marine sediments is of great significance for the development and utilization of marine resources and understanding the life process. Resistivity is the overall characteristic of the electrical conductivity of marine sediments. Measuring the resistivity of marine sediments is helpful to ascertain the marine geological structure, study the distribution of marine mineral resources, and evaluate the marine soil environment. Measuring the resistivity of marine sediments is of great significance to promote marine exploration. At present, the resistivity measurement device on the market can be directly used to measure soil and water on land, but if used to measure marine sediments, it will be disturbed by seawater temperature and pressure, resulting in large errors. In this paper, a high-precision pressure-maintaining transfer system of marine sediment resistivity measurement instrument based on circular permutation electrode is designed, which can measure the resistivity of marine sediment samples after pressure-maintaining transfer. At the same time, a new type of circular permutation electrode measurement method is proposed, which makes the resistivity value more accurate, reduces the length of the probe appropriately, and saves the cost. By measuring the resistivity of marine sediments, the type of sediments can be inverted, which provides a way of thinking about the promotion of the research and development and utilization of marine resources.
Highlights
IntroductionMarine sediments [1] are composed of insoluble materials (rocks, soil particles, etc.) transported from land to sea by wind, ice, and rivers
Marine sediments [1] are composed of insoluble materials transported from land to sea by wind, ice, and rivers
A new type of resistivity measurement method based on circular permutation electrode is proposed in the design of marine sediment resistivity measurement system
Summary
Marine sediments [1] are composed of insoluble materials (rocks, soil particles, etc.) transported from land to sea by wind, ice, and rivers. The resistivity meter for monitoring water quality and measuring soil has become mature, but most of the devices used in marine sediments do not consider the seawater temperature or pressure. In view of the lack of consideration of seawater temperature and pressure in the current resistivity meter for marine sediments, this paper designed a new type of resistivity measurement device for marine sediment samples after pressure-maintaining transfer. The corresponding device and probe rod were designed to avoid the influence of temperature and pressure on the resistivity value of sediments. The resistivity measurement system designed in this paper is mainly used for the measurement of marine sediments after pressure-maintaining transfer. A principle block diagram and device diagram of pressure-maintaining transfer system of the marine sediment resistivity measuring instrument are shown in Figures 2 and 3 as follows.
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