高频海底地震仪性能检测

Performance test of high-frequency ocean bottom seismometer

海底地震仪(ocean bottom seismometer,OBS)采集数据的可靠性取决于地震仪的性能,但目前国内还没有配套的OBS性能检测设备。OBS可控音频测试仪借鉴了拖缆地震采集系统的性能检测系统,使用脉冲信号和固定频率的音频信号作为源信号,并针对OBS的性能指标在出航前进行性能检测,即波形一致性、时间一致性、主频偏差与频谱分析、信噪比、增益分析和脉冲与频谱分析,来确定OBS的可靠性,从而保证数据采集的质量,为野外作业提供了技术保障。

Reliability of ocean bottom seismometer （OBS） data depends on the performance of OBS, but there is no OBS performance detection equipment in China currently. The OBS controllable audio test instrument refer to the performance testing system for towing seismic acquisition system, and uses pulse signal and fixed frequency audio signal as the source signal. OBS performance is tested in terms of performance index before sailing. These indexes include the waveform consistency, time consistency, frequency deviation, spectral analysis, signal-to-noise ratio, gain analysis and pulse spectral analysis. The OBS controllable audio test instrument can determine the reliability of OBS, ensure the high quality of data collected by OBS, and provides technical support for field operation.