LASER SEISMOMETER Russian patent published in 2008 - IPC G01V1/16 G01B11/16 

FIELD: instrument engineering.

SUBSTANCE: instrument is comprised of basic plate and active laser material fixed between polarised separating prism and partially transmitting mirror. Mirror is mounted onto basic plate so that one part of radiation is reflected by mirror in auto collimation manner and the other is transmitted to photo sensor installed behind mirror when optical radiation comes out of active laser material. Differential frequency measuring unit is connected to photo sensor outputs. Two mirrors are fixed fast to basic plate at equal distance from beam separation point in polarised prism. Two-sided mirror is fixed to piezo-element, which is connected with modular oscillation generator output. Piezo-element is mounted on independent base. When optical radiation from polarised prism hits mirrors, reflected from mirrors beams are directed towards each other and along common direct line, and two-sided mirror is installed perpendicular to the above line and at equal distance from mirrors with the use of piezo-element and independent base.

EFFECT: improvement of seismic distortions measurement sensitivity.

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