Research Of Integrated Measurement And Control System For Multi-Field And Multi-Parameter In-Situ Measurement Of Submarine Sediments

The physical properties of seafloor sediments are of great importance to many aspects such as seafloor resource exploration,seafloor engineering construction,and military marine security.In-situ measurement,as a technical tool,can measure the physical characteristics of the in-situ environment of seafloor sediments in a more realistic way.With the increasing improvement of marine scientific research system and the deepening of multidisciplinary cross-trend,the traditional single in-situ measurement method of marine physical field can hardly meet the demand of multi-element detection.Therefore,this paper designs and develops an integrated measurement and control system for in-situ multi-field and multi-parameter measurement of seafloor sediments,which can control the waveform,frequency,number of cycles,and delay of the emitted signals,and can complete the measurement of acoustic,magnetic,and temperature signals at the same time.According to the requirements and indexes of the integrated in-situ measurement and control system for multi-field multiparameter measurement of submarine sediments,the overall system scheme is designed in this paper,and the sensor selection,hardware circuit and software program are designed according to the overall scheme.The design of hardware circuit mainly includes the selection of FPGA chip,DA module circuit,power amplifier module circuit,AD module circuit and Ethernet transmission module circuit.The design of the software program mainly includes the design of the lower computer program and the upper computer program.The lower computer program should meet the following functions: receiving commands from the upper computer and processing them accordingly,driving the relevant modules of signal generation to emit the specified sound waves,collecting and controlling the data of each parameter,and uploading the control data to the upper computer.The upper computer program should meet the following functions: sending commands to the lower computer according to the requirements,receiving,displaying and saving the data uploaded by the lower computer in real time.Finally,the upper and lower computers of the overall system were interfaced under laboratory conditions.The test results show that the maximum absolute error of the emitted signal frequency of the system is 0.4Hz,the collected data matches the emitted signal frequency,the system can work continuously for more than 1.5 hours in cyclic mode without crashing or jamming,the received data is accurate without messy code or loss,and the system is stable and reliable.After the intermodulation test,each sensor is connected to the system,and the relevant measurement results are consistent with the actual.