Abstract
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 × 10−9 to 5.5 × 10−8 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 Książ (Poland) seismological observatory.
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Jaroszewicz, L.R., Krajewski, Z., Kowalski, H. et al. AFORS autonomous fibre-optic rotational seismograph: Design and application. Acta Geophys. 59, 578–596 (2011). https://doi.org/10.2478/s11600-011-0011-7
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DOI: https://doi.org/10.2478/s11600-011-0011-7