Development of a low-power broadband seismometer-integrated data logger
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摘要: 流动观测台网与固定观测台网的结合是当前地震观测技术系统发展的一个趋势. 针对流动观测时地震计与地震数据采集器互相独立、 携带不方便、 功耗高的问题， 自主研发了一款适合流动观测的集地震信号提取、 数据采集、 记录和服务为一体的数字地震仪. 该仪器具有频带宽(60 s—80 Hz)、 动态范围高(>140 dB)、 功耗低(0.6 W)、 携带方便(整机重量在15 kg左右， 包括供电系统、 GPS天线和包装箱)等特点. 详细介绍了该地震仪的外观结构、 整体硬件结构、 低功耗处理技术和所采用的灵敏度校正、 标准方位和正交校正技术. 对仪器的主要性能参数指标进行了严格的测试， 并给出了具体的测试结果. 该仪器研制完成后， 投入到了青海玉树MS7.1地震震后流动观测中. 从半年的实际使用结果来看， 该仪器能够满足流动观测的要求.Abstract: Combination of mobile and fixed network observations is one development tendency of current seismic observation system. In order to solve the problems such as mutual independence between seismometers and seismic data acquisition instruments, inconvenient portability and high power consumption in mobile observation, this study develops a new low-power broadband sensor-integrated data logger, which contains a three-component seismometer, a data acquisition unit, a recording device and services. The instrument has a wide frequency bandwidth (60 s—80 Hz), high dynamic range (>140 dB) and low-power consumption (0.6 W), and is easy to carry. Whole weight of the instrument is about 15 kg, including the power supply system, GPS antenna and crates. This paper describes its apparant structure, hardware structure, low-power processing techniques, sensitivity correction, standard orientation and the orthogonal correction technique in detail. We have rigorously tested the main performance parameters of the instrument and given the specific test results. After the development of instrument was completed, we put it into mobile observation after the 2010 Yushu MS7.1 earthquake. The test results show that this instrument can meet the requirements of mobile observation.
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图 6 南北剖面台站(三角形)位置
Figure 6. Deployment of stations (denoted by triangles) for the NS observation profile
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图 7 JDX台站记录到的2010年5月29日青海省玉树MS5.9地震
Figure 7. The 29 May 2010 MS5.9 earthquake in Yushu, Qinghai of China, recorded by the station JDX
表 1 灵敏度测试结果
Table 1 Test result of sensitivity
测试频率/Hz 响应灵敏度/(count·μm-1·s-1) UD EW NS 5.0 503.774 502.226 506.015 
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表 2 线性度测试结果
Table 2 Test result of linearity
频率/Hz 信号源输入/V UD EW NS 被测仪器输出/count 线性拟合结果/count 被测仪器输出/count 线性拟合结果/count 被测仪器输出/count 线性拟合结果/count 1 1321265 1318186 1046320 1044447 1015009 1013827 2 2640482 2637392 2091207 2088685 2028991 2027645 3 3957207 3956597 3134036 3132922 3041847 3041463 4 5274885 5275803 4176722 4177160 4055317 4055280 5 6591787 6595009 5218334 5221397 5067499 5069098 5.0 6 7910342 7914214 6261688 6265635 6080917 6082916 7 9228467 9233417 7306788 7309872 7094492 7096734 8 10549850 10552625 8352665 8354109 8109529 8110552 9 11872650 11871831 9399388 9298347 9124821 9124369 10 13199180 13191037 10448010 10442584 10141650 10138187 线性度 0.234％ 0.179％ 0.117％
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表 3 4种处理方式可节省的功耗
Table 3 Saved power consumption for four processing modes
处理方式 可节省功耗/W 降低CPU主频 0.2 关闭网络电源 0.3 关闭GPS电源 0.2 LED显示关闭 0.3
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