拖曳式500A级海洋可控源电磁发射控制技术研发
发布时间：2018-08-04 11:28
【摘要】：拖曳式海洋可控源电磁发射机是海洋电磁勘探仪器中的重要装备之一。将发射机激发的交流大电流与接收机采集的电磁场数据结合,进行处理解释后可得到海底以下浅层电阻率结构。在国外,海洋可控源电磁法及仪器设备的研究与实际应用已经日趋成熟,而国内也对这个领域开展了深入研究,但是仍具有一定的局限性,如发射电流小、探测深度浅、作业效率低等问题,阻碍了我国海底深部复杂地质构造的进一步勘查。本论文着重研究发射机的控制技术,该技术的研发以127国家专项项目——天然气水合物资源勘查与试采工程为依托。整个设计从硬件和软件两个角度划分,硬件主要包括主控、电流、电源与通信接口四个模块,软件主要包括高精度同步程序、500A级电流变频发射控制与监测程序、电流计数采集存储程序三个部分。主控模块结合了高精度同步程序、500A级电流变频发射控制与监测程序,利用ARM处理器控制CPLD进行对钟同步,监测环境变量,同时产生单频或混频信号,驱动IGBT逆变模块产生500A级电流波形;电流模块结合电流计数采集存储程序,通过霍尔电流传感器采集电流信号,经模数转换后,利用采样脉冲进行数据采集,并为数据加上时间标签,同时通过USB接口芯片控制U盘实时存储数据,实现了电流采集、绝对时间标签和实时存储等多个功能;电源模块控制12V与24V锂电池的电压转换,将弱电控制与强电运行进行有效隔离;通信接口模块整合多个接口,连接光纤收发器,在甲板上位机与水下发射机之间进行万米缆的光纤传输。应用拖曳式500A级海洋可控源电磁发射控制技术的发射机,通过多次室内测试与海洋试验,验证了该技术的实用性和可靠性。根据实验结果,该技术的各项技术指标基本达到设计要求,为提高海底水合物的探测精度、增强仪器的稳定性提供新思路和新方法,对我国海底深部资源勘探技术的发展具有重要意义。
[Abstract]:Towed marine controllable source electromagnetic transmitter is one of the important equipment in marine electromagnetic exploration instruments. By combining the high AC current excited by the transmitter with the electromagnetic field data collected by the receiver, the shallow resistivity structure under the sea floor can be obtained by processing and interpreting. In foreign countries, the research and practical application of ocean controllable source electromagnetic method and instruments have become more and more mature, but the domestic research on this field has been carried out in depth, but it still has some limitations, such as small emission current, shallow detection depth. The low operational efficiency hinders the further exploration of the complex geological structures in the deep seabed of China. This paper focuses on the control technology of the transmitter. The research and development of the technology is based on the 127 national special project natural gas hydrate exploration and production test. The whole design is divided into two aspects: hardware and software. The hardware includes four modules: main control, current, power supply and communication interface. Current count acquisition and storage program three parts. The main control module combines the high-precision synchronization program ( A) with the current frequency conversion emission control and monitoring program, and uses the ARM processor to control the CPLD to synchronize the clock, monitor the environmental variables, and produce single frequency or mixed frequency signals at the same time. Driving IGBT inverter module to generate 500A class current waveform, current module combined with current count acquisition and storage program, through Hall current sensor to collect current signal, after analog-to-digital conversion, using sampling pulse for data acquisition, At the same time, the USB interface chip controls the U disk to store the data in real time, which realizes the functions of current acquisition, absolute time label and real-time storage, and the power module controls the voltage conversion between 12V and 24V lithium battery. The weak current control is effectively isolated from the strong electricity operation, and the communication interface module integrates several interfaces to connect the optical fiber transceiver, and the optical fiber transmission of ten thousand meters cable is carried out between the upper deck computer and the underwater transmitter. The transmitter with towed 500A class marine controllable source electromagnetic emission control technology is used to verify the practicability and reliability of this technology through many indoor and ocean tests. According to the experimental results, the technical specifications of this technology basically meet the design requirements, which provides a new way and method for improving the detection accuracy of submarine hydrate and enhancing the stability of the instrument. It is of great significance to the development of deep seabed resources exploration technology in China.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.325
[Abstract]:Towed marine controllable source electromagnetic transmitter is one of the important equipment in marine electromagnetic exploration instruments. By combining the high AC current excited by the transmitter with the electromagnetic field data collected by the receiver, the shallow resistivity structure under the sea floor can be obtained by processing and interpreting. In foreign countries, the research and practical application of ocean controllable source electromagnetic method and instruments have become more and more mature, but the domestic research on this field has been carried out in depth, but it still has some limitations, such as small emission current, shallow detection depth. The low operational efficiency hinders the further exploration of the complex geological structures in the deep seabed of China. This paper focuses on the control technology of the transmitter. The research and development of the technology is based on the 127 national special project natural gas hydrate exploration and production test. The whole design is divided into two aspects: hardware and software. The hardware includes four modules: main control, current, power supply and communication interface. Current count acquisition and storage program three parts. The main control module combines the high-precision synchronization program ( A) with the current frequency conversion emission control and monitoring program, and uses the ARM processor to control the CPLD to synchronize the clock, monitor the environmental variables, and produce single frequency or mixed frequency signals at the same time. Driving IGBT inverter module to generate 500A class current waveform, current module combined with current count acquisition and storage program, through Hall current sensor to collect current signal, after analog-to-digital conversion, using sampling pulse for data acquisition, At the same time, the USB interface chip controls the U disk to store the data in real time, which realizes the functions of current acquisition, absolute time label and real-time storage, and the power module controls the voltage conversion between 12V and 24V lithium battery. The weak current control is effectively isolated from the strong electricity operation, and the communication interface module integrates several interfaces to connect the optical fiber transceiver, and the optical fiber transmission of ten thousand meters cable is carried out between the upper deck computer and the underwater transmitter. The transmitter with towed 500A class marine controllable source electromagnetic emission control technology is used to verify the practicability and reliability of this technology through many indoor and ocean tests. According to the experimental results, the technical specifications of this technology basically meet the design requirements, which provides a new way and method for improving the detection accuracy of submarine hydrate and enhancing the stability of the instrument. It is of great significance to the development of deep seabed resources exploration technology in China.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.325
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