The Key Technology Of Borehole Seismometer Research And Experiment

Seismic technology has great significance for the development of seismology,the rapid development of economic construction in the country today,the effects of the Earth's surface as well as man-made noise,the ground became a tradition of serious disturbances and seismic geophysical observations of the planet weak signal and physical shock information submerged in high noise background is difficult to identify.Borehole seismic avoid outside interference,improve the sensitivity of the monitoring equipment,you can get more and more realistic ground motion information is an effective means and methods of observation noise ratio.In view of this,the paper borehole seismometers key technology research and experiments.In this paper,the basic principle of seismometer paper introduces a transfer function model by the displacement detector circuitry and feedback model seismometer constitute a circuit,the feedback circuit,the output voltage obtained seismometer earthquake acceleration response.Theoretical analysis of borehole seismometers were key technology of miniaturization and borehole devices based.Horizontal borehole seismic meter prototype to the pendulum and vertical pendulum selected were "garden gate" structure and leaf spring arrangement,the pendulum adjustment structure position,thereby adjusting the cycle size to solve how to get in a small space problems long period of performance indicators.In order to facilitate the well,the design of the prototype borehole seismometers borehole means to address the borehole device coupling seal and borehole wall,and stress affect the data transfer cable to the instrument,underground leveling position to determine such issues.By underground seismometers experimental prototype debugging of surface experiments,bandwidth,sensitivity,maximum output voltage,dynamic range,linearity and other performance tests,and CTS-1 very broadband seismometer lengthy comparative observation borehole seismic verification count two prototype instrument reliability and consistency of performance.The results show that the prototype borehole seismometers during the trial observation,good performance,truly observed tidal,pulsing,short-period seismic waves,the long-period seismic wave and long-period seismic waves,to achieve better test results.