A new Ag/AgCl sensor for measuring marine electric fields was prepared and characterized through electrochemical methods and scanning electron microscopy.Its performance was evaluated in both laboratory and deep-water...A new Ag/AgCl sensor for measuring marine electric fields was prepared and characterized through electrochemical methods and scanning electron microscopy.Its performance was evaluated in both laboratory and deep-water settings.The study indicates that the double-pulse electrodeposition method is advantageous for producing Ag/AgCl sensors that maintain excellent stability over time.During a 20-day continuous stability test,the potential difference of the sensor consistently remained between -24.76μV and 62.07μV,with a minimum potential difference drift of 2.77μV per 24 h.All sensors accurately detected artificial signals in both the time and frequency domains,and their responses were consistent with one another.The minimum noise level of the sensor was 0.59 nV(√Hz)^(-1)@1 Hz.The sensor performed well in high-precision electric field measurements at a depth of approximately 2800 m in the South China Sea.The high stability and low noise level of the sensor make it an effective tool for detecting electrical conductivity structures beneath the seafloor.展开更多
To accurately acquire deep-sea live biological samples,a hydraulic suction macro-biological pressure-retaining sampler(HSMPS)was designed to achieve active capture of seafloor biological by a suction pump.The complex ...To accurately acquire deep-sea live biological samples,a hydraulic suction macro-biological pressure-retaining sampler(HSMPS)was designed to achieve active capture of seafloor biological by a suction pump.The complex flow fields of deep-sea biologicals at three different locations were simulated.The deep-sea biologicals cause the flow field pressure and velocity to rise at different locations of the sampler,and the magnitude of the rise varies at different locations.The internal flow properties of the sampler were analyzed for different pumping flow rates the sampler.When the flow rate of the sampler pump was greater than 14 m3/h,the velocity of the inlet of the inflow area was greater than the limiting velocity of the deep-sea biologicals.The pumping test of deep-sea biologicals pumping sampler was carried out in the laboratory,and the test results were basically consistent with the simulation analysis.In order to balance the deep-sea biologicals damage and escape rate,the pumping flow of the sampler should be controlled between 14 and 16 m3/h.The test results provide a theoretical basis for the design of deep-sea biologicals sampling equipment.展开更多
基金supported by the National Natural Science Foundation of China(Nos.U23B20158,91958210,42004055)。
文摘A new Ag/AgCl sensor for measuring marine electric fields was prepared and characterized through electrochemical methods and scanning electron microscopy.Its performance was evaluated in both laboratory and deep-water settings.The study indicates that the double-pulse electrodeposition method is advantageous for producing Ag/AgCl sensors that maintain excellent stability over time.During a 20-day continuous stability test,the potential difference of the sensor consistently remained between -24.76μV and 62.07μV,with a minimum potential difference drift of 2.77μV per 24 h.All sensors accurately detected artificial signals in both the time and frequency domains,and their responses were consistent with one another.The minimum noise level of the sensor was 0.59 nV(√Hz)^(-1)@1 Hz.The sensor performed well in high-precision electric field measurements at a depth of approximately 2800 m in the South China Sea.The high stability and low noise level of the sensor make it an effective tool for detecting electrical conductivity structures beneath the seafloor.
基金Supported by National Key Research and Development Program of China(Grant Nos.2023YFC2809304,2022YFC2805904)National Natural Science Foundation of China(Grant No.52275106)Special Project for the Construction of Innovative City in Xiangtan of China(Grant No.ZX-ZD20221005).
文摘To accurately acquire deep-sea live biological samples,a hydraulic suction macro-biological pressure-retaining sampler(HSMPS)was designed to achieve active capture of seafloor biological by a suction pump.The complex flow fields of deep-sea biologicals at three different locations were simulated.The deep-sea biologicals cause the flow field pressure and velocity to rise at different locations of the sampler,and the magnitude of the rise varies at different locations.The internal flow properties of the sampler were analyzed for different pumping flow rates the sampler.When the flow rate of the sampler pump was greater than 14 m3/h,the velocity of the inlet of the inflow area was greater than the limiting velocity of the deep-sea biologicals.The pumping test of deep-sea biologicals pumping sampler was carried out in the laboratory,and the test results were basically consistent with the simulation analysis.In order to balance the deep-sea biologicals damage and escape rate,the pumping flow of the sampler should be controlled between 14 and 16 m3/h.The test results provide a theoretical basis for the design of deep-sea biologicals sampling equipment.
