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AFORS Autonomous Fibre-Optic Rotational Seismograph: design and application

Jaroszewicz L.R., Krajewski Z., Kowalski H., Mazur G., Zinówko P., Kowalski J.

Acta Geophysica

2011

Vol. 59, no. 3

578-596

We outline the research leading to development of the Autonomous Fibre-Optic Rotational Seismograph (AFORS) and describe the final version of the instrument. The instrument with linear changes of sensitivity keeps accuracy from 5.1 x 10minus9 to 5.5 x 10minus8 rad/s in the detection bandpass 1.66-212.30 Hz; it is designed for a direct measurement of rotational components emitted during seismic events. The presented system is based on the optical part of the fibre optic gyro construction where a special autonomous signal processing unit (ASPU) optimizes its operation for the measurement of rotation motions instead of the angular changes. The application of a newly designed telemetric system based on the Internet allows for a remote system control, as shown in an example of the system's operation in Ksiaz (Poland) seismological observatory.

Application of fibre-optic rotational seismometer in investigation of seismic rotational waves

Jaroszewicz L. R., Krajewski Z.

Opto-Electronics Review

2008

Vol. 16, No. 3

314-320

Application of a fibre-optic Sagnac interferometer as a rotational seismometer is presented in this paper. It is a new device which parameters (sensitivity equal to 4.3x10⁻⁸ rad/s for 2ð) are comparable with the parameters of typical mechanical rotational seismometers. However, a direct measurement of rotation without influence of linear motions for fibre-optic rotational seismometer designed it for a direct measurement of a ground rotation component. Experimental data obtained during simultaneous application of the above two types of sensors are also presented. Research of near-field seismic events, the amplitude of which has been identified in the range of 1.5x10⁻⁶ rad/s to 2x10⁻⁷ rad/s, shows directly that, so-called, seismic rotational waves exist independently of typical seismic waves generated during earthquakes.