Citation: | LI Jiawei, CHEN Jie, XU Xing, PAN Feiru, LUO Xianhu, YU Xinqin, LUO Xinheng. A new equipment for deep-sea geothermal gradient measurement (FY2)[J]. Marine Geology & Quaternary Geology, 2021, 41(3): 203-211. doi: 10.16562/j.cnki.0256-1492.2020092702 |
The seabed geothermal research has become a common component of integrated marine geological survey nowadays and high requirements are raised to the technical performance of instruments for seabed measurement. Based on the FY1, the self-contained miniature temperature measurement recorder independently developed by Guangzhou Marine Geological Survey, a new type of self-contained miniature temperature measurement recorder, FY2 in abbreviation, was developed after summarization of previous practicce data and survey experiences. In order to verify the performance of the FY2, efforts have been devoted to the instrument calibration and the comparison of the FY2 to the FY1 in laboratories under a constant temperature flume as well as in the deep water area on the northern slope of the South China Sea. Results show that the resolution of the FY2 is higher than 0.0001 ℃, and the precision is higher than ±0.0015 ℃. The seabed geothermal flow value of the measuring point is 78 mW/m2; indicating an excellent performance of the new equipment. The new equipment also has high efficiency, and may provide strong technical support for the research of seabed geothermal flow.
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Installation instruction diagram for FY2 probe
Electronic circuit block diagram & PCB board picture for FY2 probe
Changes of the indications for FY1 and FY2 probes at each standard temperature point in laboratories
Schematic location map of the testing area
The temperature-time curve of the FY1 probe and FY2 probe inserted into the seabed sediment for three times
In the process of inserting into the seabed for the first time and calculating the geothermal gradient, the temperature points measured by the FY1 probe and the FY2 probe respectively, and the linear fitting relationship between temperature and probe distance