Research On Principle Model Of In Situ Measuring Device For Carbon-bearing Fluid In Deep Ocean

Since the "Alvin" deep sea vehicle discovered hydrotherm and hydrothermal biota at the deep ocean of Galapagos archipelago in the year of 1977, the hydrothermal system and its correlative field have become the research focus on the international front edge. The cold seepage is a new type of seafloor fluid since the discovery of hydrothermal. Both hydrothermal and cold seepage abundant in methane and carbon dioxide, to understand their distribution in the deep ocean is helpful for research on hydrothermal sulfide and micro-biota, sea-floor carbon cycle, thermal cycle, cold seepage authigenic carbonate and microbe carbon sequestration, hydrothermal vent ecosystem and cold seep community, deepwater hydrocarbon exploration etc. Some gas sensors around the world are listed. Though there are many mature merchant models, but most of them are for measuring the concentration of CO₂ and CH₄ in the air, instead of for carbon-bearing fluids in the deep ocean.K-METS produced by the Germanic corporation is the only merchant type of methane sensor in seawater. Another commonly used type is the Non-dispersed Infrared Gas Sensor which and Wuhan Sifang Optoelectronics Co., Ltd. The later is methane in the air. Their working principle and deficiency was discussed. A principle model of in situ measuring device for carbon-bearing fluid in deep ocean is proposed as a solution. It is based on physical decompression to make the gases escape from fluids, and then measure the gas by infrared method.