作者：李怀良^1,2, 庹先国^1,2, 任家富¹, 朱丽丽¹

作者单位：1. 地球探测与信息技术教育部重点实验室(成都理工大学), 四川 成都 610059;
2. 地质灾害防治与地质环境保护国家重点实验室(成都理工大学), 四川 成都 610059

关键词：多道信号采集; 地震信号; 分时切换; ADS1256转换器

摘要：

针对工程地震信号采集设备的便携性问题,采用MSP430F149驱动单片24位ADS1256以分时切换方式控制四路差分信号采集,实现系统的低功耗、小型化设计。重点介绍有限存储空间内大数据量的暂存、A/D通道切换与数据存储时间差的平衡问题,包括A/D分辨率和精度的提高方法。系统最终实现最大1kS/s等效采样率时四通道2048点的并行采集存储,分辨率在19位以上,从其在自主开发的无线遥测式地震仪应用效果来看,其信号频谱均满足有效地震波勘探需求。

Design and implement on miniature and multi-channel seismic signal acquisition system

LI Huai-liang^1,2, TUO Xian-guo^1,2, Ren Jia-fu¹, ZHU Li-li¹

1. Key Lab of Earth Exploration & Information Techniques of Ministry of Education, Chengdu 610059, China;
2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China

Abstract: For solving the portability problem of engineering seismic signal acquisition equipment, the authors adopt MSP430F149 to driver single 24-bit ADS1256 to control four-channel differential signal acquisition by time-sharing switching, and to accomplish the low-power and miniature design on the system of multi-channel engineering seismic signal acquisition. It focused on problems that the large amount of data is stored temporarily in limited storage space and the balance of time difference between A/D channel switching and a large amount of data storage, including the means to improve A/D resolution and accuracy. The system ultimately achieves the four-channel 2048 points parallel acquisition and storage with maximum 1ks/s sampling rate and higher than 19bits resolution. According to the effects obtained from the experiment applying it to wireless telemetry seismograph which is self-developed, the signal spectrum meets the demand for effective seismic wave exploration.

Keywords: multi-channel signal acquisition; seismic signal; time-sharing switching; ADS1256

2013, 39(1): 97-100  收稿日期: 2012-8-30;收到修改稿日期: 2012-10-22

基金项目: 国家杰出青年基金项目(41025015)

作者简介: 李怀良(1985-),男,安徽阜阳市人,博士研究生,主要从事地球物理勘探仪器研发与数字信号处理工作。

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