Abstract

ABSTRACT In this article we show a fibre-optic device base d on the Sagnac effect designed for measuring rotational motions which appear during seismic events. The experimental investigation s of presented Autonomous Fibe r-Optical Rotational Seismograph s indicate that such device s keep the accuracy no less than  -9 WR  -8 rad/s in the frequ ency band from 0.83 Hz to 106.15 Hz. Furthermore , the ir operations are controlled fully remotely via Internet. W e present the comparison of results obtained by such system in the field test with a mechanical rotational seismo meter which is mounted simultan eously in the seism ological observatory LQ.VL*3RODQG Keywords : fibre optic sensor ; rotational seismograph ; seismic events; remote control ; Internet 1. INTRODUCTION The observations of strange, rotational deformations of buildings after earthquakes lead to enlargement of interest in seismic rotational phenomena 1

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