关键词: 仪器仪表技术, 无线同步, 预测模型, 浅层地震勘探, 数据采集, 模数转换

Abstract:

In order to solve the time synchronization problem of shallow seismic prospecting signal acquisition, a data acquisition system of shallow seismic exploration based on wireless network is presented. It uses AT89C51 micro-controller as the main controller, uses AD7705 modulus conversion chip with low power consumption and high resolution to realize data collection, chooses nRF24L01 to set up wireless network. In accordance with the characteristics of modulus conversion unit and MCU, the power module and the voltage stabilizing circuit are designed to realize accurate flexible power supply. By determining the realtime data of different transmission distance, using seismograph for time compensation the data acquisition synchronization is realized, solving the complex wiring and synchronization problems when the conditions for exploration, realizing low power, portable and synchronization function in the shallow seismic exploration. Tests show that the system power consumption is 2 500 mW, the wireless transmission distance is 94 m, and transmission delay time is less than 1.87 μs.

Key words: instrument and meter technology, wireless synchronous, prediction model, superficial seismic exploration, data acquisition, analogtodigital conversion