Laser interferometry-based seismic sensor

Fabrizio Barone; Rosario De Rosa; Leopoldo Milano; Ketevan Qipiani

doi:10.1117/12.462946

14 March 2003 Laser interferometry based seismic sensor

Fabrizio Barone, Rosario De Rosa, Leopoldo Milano, Ketevan Qipiani

Proceedings Volume 4886, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II; (2003) https://doi.org/10.1117/12.462946
Event: International Symposium on Remote Sensing, 2002, Crete, Greece

Abstract

Laser interferometry is one of the most sensitive and versatile techniques for small relative displacements measurement. For these reasons it is used or it is being introduced in many different fields of research. One of its possible applications is seismic activity monitoring, obtained by fixing the mirrors of an interferometer to the ground. In order to obtain a preliminary experimental evaluation of the performances of such an instrument, we tested a simple Michelson interferometer in air as a seismic sensor and compared its sensitivity with a standard seismic sensor. We demonstrated that in the low frequency region the interferometric sensor is much more sensitive and therefore it can represent a valid alternative or replacement to a standard sensor. The optical elements needed to build the interferometer were fixed to the ground to couple the detector with seismic activity. The system were continuously monitored also to take into account of misalignments coming from abnormal air fluctuation and displacement of the mirrors. All data coming from this system are collected by a computer for the storage and are real-time pre-analyzed in order to convert the signal coming from the interference pattern into another describing the equivalent mirrors relative displacement.

Citation Download Citation

Fabrizio Barone, Rosario De Rosa, Leopoldo Milano, and Ketevan Qipiani "Laser interferometry based seismic sensor", Proc. SPIE 4886, Remote Sensing for Environmental Monitoring, GIS Applications, and Geology II, (14 March 2003); https://doi.org/10.1117/12.462946

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