新型煤矿井下单分量无缆地震仪研制

槽波地震勘探技术具有探测范围广、准确率高的特点，在煤层地质构造的精细化勘探中作用越来越重要，但当前地震勘探装备多数体积笨重、施工布设大量线缆，效率低下，施工成本较高，严重制约了煤矿井下高精度槽波地震勘探技术的发展。针对上述问题，借鉴节点式地震仪的设计理念，将动圈检波器与采集控制电路、时间精度保持电路以及电源电路一同集成在一个完整的腔体中，省去大线传输，观测系统灵活、无约束，解决煤矿井下复杂工况环境下多道数地震数据采集的问题。并设计授时同步装置，通过GPS授时与温补晶振相结合的时钟机制，解决各个采集单元间的时间同步性问题，实现采集系统的小型化、轻量化、高集成度化。经过实验室及现场测试，各项性能指标均满足设计要求。 

The development of a single-component non-cable seismograph in underground coal mines

In-seam wave seismic exploration, featured in wide detection range and high accuracy, plays an increasingly important role in the refined exploration of coal geological structures. However, most seismic exploration equipment is bulky, with a large number of cables are laid in construction, leading to low efficiency and high construction cost. This seriously restricts the development of high-precision in-seam wave seismic exploration technology in underground coal mines. Based on the design concept of nodal seismograph, the moving coil geophone is integrated into a complete cavity with the acquisition and control circuit, the time precision keeping circuit and the power supply circuit. The system is flexible and unconstrained, which solves the problem of multi-channel seismic data acquisition under complex working conditions in underground coal mine. The timing synchronization device is designed, and the timing synchronization between each acquisition unit is solved by the clock mechanism of GPS timing and temperature-complementary crystal oscillator. Then the acquisition system is miniaturized, lightweight and highly integrated. After laboratory and field tests, all the performance indicators meet the design requirements.