基于STM32的数字式小折射采集节点设计  

Design of digital small refraction acquisition node based on STM32

作　　者：袁晨 李怀良 荣文钲[2,3] 黄玉清 刘勇[1] YUAN Chen;LI Huailiang;RONG Wenzheng;HUANG Yuqing;LIU Yong(School of Information Engineering,Southwest University of Science and Technology,Mianyang 621010,China;Sichuan University of Science and Engineering,Zigong 643000,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010 [2]四川理工学院,四川自贡643000 [3]成都理工大学地质灾害防治与地质环境保护国家重点实验,四川成都610059

出　　处：《传感器与微系统》2021年第4期106-109,共4页Transducer and Microsystem Technologies

基　　金：国家自然科学基金委面上资助项目(41774118);国家自然科学基金青年科学基金资助项目(41704175);四川省科技厅应用基础项目(2017JY0006)。

摘　　要：针对表层结构调查浅层地震勘探中小折射仪模拟式检波器串信号保真度低、维护成本高、信号衰减严重等问题,设计了一种低功耗、可裁剪的数字式小折射采集节点。节点以高性能的STM32F405为主控单元,前端采用高保真的信号调理电路对地震信号进行预处理,采集数据经过高精度的A/D转换后,通过自定义的PPP通信协议与采集控制中心进行通信。驱动程序设计中通过预采样与时间戳的方法使分布式节点间的同步采集精度优于10μs。实验结果表明:该采集节点等效噪声水平低于1μV,道间畸变小于-100 dB,能有效提高野外地震勘探的采集精度和施工效率。Aiming at the problem of surface structure investigation,the small refractometer analog detector string signal has low fidelity,high maintenance cost and serious signal attenuation,a low-power,croppable digital small-refraction acquisition node is designed.The node is based on the high-performance STM32F405.The front end uses high-fidelity signal conditioning circuit to preprocess the seismic signal.After the high-accuracy A/D conversion,the data is collected through the customized PPP communication protocol and the acquisition control center.Communication.The pre-sampling and time stamping method in the driver design makes the synchronous acquisition accuracy between distributed nodes better than 10μs.The experimental results show that the equivalent noise level of the acquisition node is lower than 1μV,and the inter-channel distortion is less than-100 dB,which can effectively improve the acquisition accuracy and construction efficiency of field seismic exploration.

关 键 词：表层结构调查 小折射 STM32单片机 PPP通信协议 同步采集 

分 类 号：TN710[电子电信—电路与系统] TH763[机械工程—仪器科学与技术]