Because the solution to geophone motion equation has not been found, the coupling relation between the geophone and the ground has not been explained. We find its solution by using LapLace transform. From this we find the output potential signal of the geophone includes not only the vibration of underground reflection, but also the vibration whose frequency is the natural frequency of geophone. Therefore, we must first remove the vibration at natural frequency of geophone when underging information processing.... Because the solution to geophone motion equation has not been found, the coupling relation between the geophone and the ground has not been explained. We find its solution by using LapLace transform. From this we find the output potential signal of the geophone includes not only the vibration of underground reflection, but also the vibration whose frequency is the natural frequency of geophone. Therefore, we must first remove the vibration at natural frequency of geophone when underging information processing. Geophone has selecting frequency function, the stronger the output signal, the closer the frequency of seismic wave to the natural frequency of geophone. The output signal can be enhanced by improving the sensitivity of geophone, reducing damping and increasing the natural frequency of geophone. Receiving seismic signal has to use geophone with variable natural frequency or the combination of several geophones with different natural frequencies in the field. |