The Technique for Memorizing Acquisition Data Doubly and Simultaneously on the Marine Magnetotellurics

The marine environment is complex. Both the overseas literatures and the domestic applications indicate that when the detecting device is working on the seafloor, losing the data occasionally happens because of various unexpected factors. Compared with continental operation, there are higher risk and expenses in detecting and more difficult in acquisition repeatedly on the marine magnetotellurics. Therefore, it is of great scientific significance to study the technique prospecting doubly and simultaneously so as to extract the whole medium electric information in exploration areas and ensure the integrality of the real acquisition data. The project chooses the PC104 computer as microcontroller and also comprises of the interface circuit, which converts the PC104 bus to the USB bus and saves the real time data acquired on the marine magnetotellurics into the IDE disk and U disk simultaneously. The chips adopted by the circuit include CPLD in encoding and logic controlling, bidirectional data received and transmitted and CH375A of interface conversion, and the source program of PC104 also contains their corresponding instructions. With that function, it has insured the full preservation of the acquisition because of redundant data. The practicality has been approved by Huanghai Sea experimentation.