The Overall Design Of 3D Resistivity Instrument Acquisition Substation Based On LPC1788

The electrical prospecting is developing in direction of finding out the fine geological structure of three-dimensional, but the centralized high-density resistivity exploration instrument on the domestic and foreign market is difficult to meet the three-dimensional electrical prospecting instrument’ requirements of multichannel, large area, high precision、parallel、and synchronous data acquisition at present.Based on a large collection of today’s domestic and foreign research data,and the previous project "LQC-Ⅱ 3D resistivity acquisition system" has successfully developed, the overall scheme of acquisition system for 3D resistivity prospecting is optimized, especially for key data collection sub-station’s soft 、 hardware design, improves anti- interference ability of the data collection substation, And in the design of sub-station increased the man- machine interface design, U disk storage and USB communication function of the program design, make each sub-station can also work independently without industrial computer.According to the structure characteristics and working principle of 3D resistivity data acquisition system, puts forward the whole des ign of data collection substation, chooses the processor LPC1788 of ARM Cortex-M3 with 32-bit kernel as the main control system and the ADS1278 24 of 24 bit sigma delta A/D converter chip for data system. At the same time, using the Cadence16.3 software for 3D resistivity data collection substation for PCB design, selects the high performance transformer coupling isolation devices chips ADuM1402 has carried on the detailed research and design for data acquisition front-end signal conditioning circuit, including the PC B board of high precision data acquisition system grounding technology, electrical isolation technology, chassis shielding technology. In software design, through the KEIL uvision4 development platform and the application of μC/OS-Ⅱ operating system for developing the embedded software in the PC machine, connects the AK100 to debugging the substation’s frogram module.Finally completes the circuit hardware testing, the whole equipment test...