A laser sensor of a seismic slope of the Earth surface

A principally new method of the measurement of a seismic slope of the Earth surface is suggested. The method makes it possible to stabilize the position of the laser beam as a highly extended coordinate axis in the metrological support of the precision construction of large-scale physical installations. The method has been tested experimentally: for the first time, low-frequency periodic angular oscillations have been registered with an amplitude of 5 × 10^-7 rad and the noise registration value of 2.5 × 10^-8 rad. The measurements were taken at CERN, during the construction of the spectrometric complex ATLAS.