Test of damping ratio of large damping geophone

Damping ratio is one of the important parameters of moving-coil geophone. When the damping ratio of moving-coil geophone is large,the damping ratio is obtained according to the second peak voltage in traditional DC test method. But the signal to noise ratio of this value is low,so the test precision of the damping ratio of large damping geophone is low. To solve this problem,a new damping ratio test method is put forward. In this method,the damping ratio is calculated by means of the ratio of the first zero crossing time to the first peak time,which avoids directly using the second peak voltage for calculating the damping ratio so as to improve the test precision of the damping ratio of the large damping geophone.