FORS-II as a optimum sensor for detection of rotational seismic events

Zbigniew Krajewski; Leszek R. Jaroszewicz

doi:10.1117/12.568923

22 July 2004 FORS-II as an optimum sensor for detection of rotational seismic events

Zbigniew Krajewski, Leszek R. Jaroszewicz

Proceedings Volume 5484, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II; (2004) https://doi.org/10.1117/12.568923
Event: Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II, 2003, Wilga, Poland

Abstract

Generally, the seismic waves appear during the earthquake are bulk longitudinal or transverse type waves. However, the last developed theory shown that so called seismic rotation waves exist, also. These waves appear in the case of non-ideal elasticity due to defect content in a mdeium or due to internal structure of the medium. The detection such kind of waves should use new techniques because conventional seismographs are inertial sensors for linear acceleration, only. Form this reason the Fiber-Optic Rotational Seismometer (FORS) based on the fiber-optic Sagnac interferometer is proposed. The main advantage of such system is measurement of absolute rotation around any axis perpendicular to the optical path plane and without sensitivity to uniform linear motion or distortion. In the article system FORS-II currently developing is presented. This system using appropriate system configuration has extremely high sensitivity without characteristic for the fiber-optic gyro sensitive on polarization phenomenon.

Citation Download Citation

Zbigniew Krajewski and Leszek R. Jaroszewicz "FORS-II as an optimum sensor for detection of rotational seismic events", Proc. SPIE 5484, Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments II, (22 July 2004); https://doi.org/10.1117/12.568923

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