FIELD: physics; mining engineering.
SUBSTANCE: system contains hermetic enclosure with attached seismic vibration receiver and distributed mass pendulum, optoelectronic sensor of preset limit pendulum deviation. Pendulum consists of optically matched coherent light source and photodetector connected through photocurrent amplifier and frequency meter to alarm initiating detector. Optoelectronic sensor is represented with signal and reference fibre coils, optically connected through coherent light source and photodetector to interferometer. Herewith signal and reference fibre coils are embedded in the enclosure mounted on sea-bed, while coherent light source and photodetector are arranged in above-water control and record centre. Alarm initiating detector is designed as a transmitter provided in above-water control and record centre, satellite transponder and terrestrial station. Transmitter represents modulation code generator, phase-shift modulator, high-frequency generator, power amplifier and transmitting antenna. Terrestrial station consists of receiving antenna, high-frequency amplifier, mixer, heterodyne, intermediate-frequency amplifier, phase-shift keying signal demodulator, registration unit, audible warning device. Phase-shift keying signal demodulator contains delay line, the first, second and third adders, the first and second amplitude detectors, phase inverter.
EFFECT: higher reliability of system.
3 dwg
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