LASER INTERFEROMETRIC BOTTOM SEISMOGRAPH Russian patent published in 2018 - IPC G01V1/18 G01V1/38 

FIELD: geophysics.

SUBSTANCE: invention relates to the field of geophysics and can be used to measure the Earth crust microdeformations at the bottom of the seas and oceans and to study the space-time structure of the geophysical fields of the infrasonic and audio ranges. Laser interferometric bottom seismograph is made in the form of a sealed case, inside which there is an optical bench with an optical system made according to the Michelson interferometer scheme and a digital recording system. One of the bases of the case is muffled by a removable cover of two rigidly connected flanges – a main and a clamping – with an inner diameter smaller than the diameter of the case. Membrane is installed between the flanges, which is equipped in the center of the inverted wall of the device with a mirror and it is a sensor element of the device. Main flange is designed in such a way that it is possible to fix an optical bench on its surface, and it is possible to install inside an optical window with the formation of a chamber for the external pressure compensation during installation of the seismograph on the bottom. Clamping flange on the outside is provided with an overlap with holes, forming a protective chamber between the cover and the membrane, designed to ensure the contact of the membrane (the sensor element of the seismograph) with the ground. Second case base is provided with a sealed lead-in for a signal and power cables and a pressure compensation system.

EFFECT: increase in the sensitivity to the vertical intensity of the micro displacements of the Earth's crust in the infrasonic frequency range, the stability of the interference pattern to working loads, reduction in size and increased operational reliability.

5 cl, 1 dwg