HELMET-MOUNTED SYSTEM FOR RAPID DETECTION OF EARTHQUAKE PRECURSORS Russian patent published in 2012 - IPC G02B27/01 G01V9/00 

FIELD: physics.

SUBSTANCE: system has a helmet, a pull-down mirror made from a monocrystal - light flux polarisation analyser with a helmet viewing direction, a helmet-mounted module of a micromechanical strap-down positioning system, a radio interface for transmitting data on the angular position of the helmet to a notebook and a light flux receiving channel. The light flux receiving channel has a light filter in form of a sputtered layer on a light-gathering lens of a focusing system for input of the light flux into an optical fibre, an optical fibre coupler and two parallel signal processing channels with λ₁~660 nm and λ₂~760 nm. Each of the signal processing channels is connected in series to an acoustooptical filter, a photodiode multiplier and analogue-to-digital converter. Outputs of the analogue-to-digital converter are connected to a buffer memory unit for recording current values of the measured signals. The buffer memory unit is connected to the radio interface for transmitting the signal trace to the notebook. The required selectivity band of each acoustooptical filter is provided by the corresponding high-frequency pumping oscillator.

EFFECT: rapid and reliable prediction of seismic shock parameters.

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