摘要
随着微震监测技术不断发展和成熟,该技术在周界安防领域逐渐显现出广阔的应用前景,针对周界安防中的脚步振动信号采集,设计了一种具有低噪声、高采样率、高动态范围的三分量低噪声微震信号连续采集节点仪。该节点仪选用微机电系统(MEMS)检波器作为前置传感器,MEMS检波器的输出信号经过前级输入电路和增益放大器处理后送至32 bit低噪声的模拟数字转换(AD)芯片AD7177进行AD转换。同时,通过SPI通信读取AD7177芯片数据寄存器中的采集数据,再将数据分包存储到SD卡,并可以采用WiFi或4G无线通信等模块传输到上位机进行实时显示。该节点仪通过GPS授时实现了多节点之间的时间同步。通过实验室实验测试了该节点仪的各项性能指标,实验表明该节点仪能长时稳定地实现微震信息的实时采集、传输和存储,实验数据进一步验证了该节点仪的采集精度和低噪声等性能。
With the development and maturity of microseismic monitoring technology,it gradually shows a broad application prospect in the field of perimeter security.Aiming at the acquisition of footstep vibration signal in perimeter security,a three-component continuous microseismic signal acquisition node instrument with low noise,high sampling rate and high dynamic range is designed in this paper.The MEMS detector is used as the front sensor.The output signal of the MEMS detector is processed by the front input circuit and gain amplifier and then sent to the 32 bit low noise analog digital conversion(AD)chip AD7177 for AD conversion.At the same time,the collected data in the data register of the AD7177 chip is read through SPI communication,and then the data is subcontracted and stored in the SD card,which can be transmitted to the upper computer for real-time display by WiFi or 4 G wireless communication modules.The nodal instrument realizes time synchronization between multiple nodes through GPS timing.The performance indexes of the nodal instrument were tested through laboratory experiments.The experiments show that the nodal instrument can realize real-time acquisition,transmission and storage of microseismic information for a long time and stably.The experimental data further verify the acquisition accuracy and low noise performance of the nodal instrument.
作者
孙文达
郑晶
沈帅帅
滕星智
孙远
Sun Wenda;Zheng Jing;Shen Shuaishuai;Teng Xingzhi;Sun Yuan(School of Geosciences&Surveying Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)
出处
《国外电子测量技术》
北大核心
2022年第4期87-92,共6页
Foreign Electronic Measurement Technology
基金
中央高校基本科研业务费(2021JCCXDC02)
中国高校产学研创新基金(2020HYB08001)项目资助
关键词
微震监测
三分量
周界安防
Microseismic monitoring
three-component
perimeter security
