Research on the Isolation and Collection Method of Multi-Channel Temperature and Power Supply Voltage Under Strong Marine Controlled Source EMI

A marine controlled-source electromagnetic transmitter is an important and effective detection device for detecting methane hydrate zones and oil and gas reservoirs on the seafloor. With the deepening of its research, large current transmission has become a prevalent means to achieve deeper detection. However, the increase of current causes severe electromagnetic interference in the transmitting chamber and results in a large error in the collection of temperature and power supply voltage. Therefore, it is essential to improve the anti-interference ability of the acquisition system. In this paper, we analyzed the main interference sources and their conduction, and designed a distributed acquisition system based on the controller area network bus and used a variety of anti-interference methods to reduce the effect of interference. To verify the system’s reliability, we simulated a marine environment and tested it. The experimental results showed that the system still could send the real-time data accurately to the mainframe monitoring system when the transmitting current was up to 1528 A.