Affiliations: [a] Department of Engineering Mechanics, MOE Key Lab for
Strength and Vibration, Xi'an Jiaotong University, 28 West Xianning Road, Xian,
Shaanxi, 710049, China
Abstract: The advantage of geophone with large damping in receiving and
compensating high frequency signals is studied theoretically and
experimentally. It is found that, as the damping ratio increases, the frequency
characteristic of geophone in domain frequency region approximates to the
acceleration characteristic gradually, thus the receiving frequency bandwidth
of land seismic acquisition is widened and the record of high frequency signals
is enhanced. The adopted micro-electronic technology not only increases the
geophone damping largely, but also reduces the output impedance of geophone.
The in-situ record data by self-designed geophones with large damping
demonstrates higher visual frequency and S/N ratio, and stronger spectrum
energy. The proposed method is expected to apply to the moving-coil geophone
for high resolution seismic exploration.
Keywords: Damping, moving-coil geophone, frequency characteristic, receiving frequency bandwidth, high resolution seismic exploration
