Study of Single-fouce seismic source for deep borehole and seafloor deployment

设计了一种用于深孔和海底长期监测地震传播特性的震源。我们为这样的震源制作了试验模型，以测试我们概念设计的可行性。井内和海底环境的难点要求是低功耗，即50瓦。建立了圆柱体中质量下降产生单力的模型，该模型适用于小圆柱体低频信号的产生。利用试验模型进行的实验表明，质量落体源效果良好，但由于质量与质量导轨的摩擦，落体轨迹变化较大。这需要对质量下落进行监测。

A seismic source for long-term monitoring of propagation property by deploying in deep-borehole and seafloor are designed. We produced trial models for such a seismic source to test the feasibility of our conceptual design. The difficult requirement in borehole and seafloor environment is low-power consumption, i.e. 50watts. We developed a model with falling mass in a cylinder body to produce single-force, which is suitable to produce low-frequency signal with small body. Experiments using trial model shows that falling-mass source works well but falling trajectory varies substantially due to friction of mass and mass guide. This requires the monitoring of the mass falling.