earticle

영어

The main purpose of this study is to develope a dry-contact geophone sensing device that improves sensor coupling to structural members during elastic wave measurements without a need of coupling materials. Test results in the laboratory showed that the signal-to-noise ratio (SNR) of typical signals from the proposed sensing devise was about 48dB, which was comparable to that of a commercially available integrated circuit piezoelectric (ICP) accelerometer. Furthermore, the value was about 35 dB improved than using a conventional geophone using vacuum grease as a couplant material. In addition, typical signals from the proposed sensing devise had excellent coherence (about 99.6%) to the values from an ICP accelerometer, which was about 10% improved than using a conventional geophone. In addition, when applied to impulse response and multichannel analysis of surface waves, the proposed sensing devise resulted in equivalent or improved accuracy compared to the two conventional sensors and significantly improved test speed.