|"JOURNAL OF RADIOELECTRONICS" N 10, 2000|
HIGH-PRECISION LASER INTERFEROMETERS IN MULTICOMPONENT MEASURING SYSTEMS
M. N. Dubrov, V. A. Alyoshin
of Radio Enginering and Electronics, RAS
The new multicomponent laser strainmeters have been developed and tested. The interferometer instruments of 1-2 m length have threshold resolution about 0.001 nanometer and dynamic range up to 180-190 dB. This is achieved using by especial device: dynamic range expander which allows to measure the seismic and another strains of the earth surface both in horizontal and vertical planes with high accuracy. A number of long term geophysical observations was made during 1997- 1999. The first estimation for vertical component of the earth surface strain/barometric factor has been obtained. The advance of a course of the earth surface strains as contrasted to by course of atmospheric pressure is revealed.