【摘要】 为更好地解决浅层地震勘探信号采集的时间同步问题,提出一种基于无线网络的浅层地震勘探数据采集系统。设计并完善基于应变式压力传感器的检波装置,以AT89C51单片机作为主控制器(MCU:Micro Controller Unit),采用低功耗、高分辨率的16位Σ-Δ型模数转换芯片AD7705实现数据采集,选用nRF24L01组建无线网络,给出电源模块和稳压电路以实现准确灵活供电。通过确定数据采集系统不同传输距离的实际时间差值,利用地震仪进行时间补偿,从而实现数据采集同步。测试结果表明:系统在测试期间功耗为2 500 mW,无线传输最远距离为94 m,延迟时间最短为1.87×10-6s。解决了勘探环境恶劣时的复杂布线和同步问题,实现了浅层地震勘探的低功耗、便携式的同步功能。更多还原

【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.更多还原