29 December 1998 Wideband laser interferometer for monitoring the Earth strains
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Proceedings Volume 3682, Laser Optics '98: Solid State Lasers; (1998) https://doi.org/10.1117/12.334779
Event: Laser Optics '98, 1998, St. Petersburg, Russian Federation
Abstract
The wide-band laser interferometer with a measurable armlength of 75 m has been installed in an underground tunnel (the North Caucasus), in one of the most active in geodynamic respect region of Russia. The optical scheme of the interferometer is the two passes (N equals 2) Michelson- type interferometer with unequal arms working in regime of space separated beams which is realized by use of the corner reflectors. The mirrors, the beam-splitter and the optical passes are placed in vacuum (5 X 10-5 mbar). The long-term monitoring strains of the Earth is provided in two frequency bands: below 0.1 Hz and in the bandwidth of 0.5 Hz around frequency of 1.62 kHz (the monitoring of quadrature components). The sensitivity in the high frequency band is about 10-15 Hz-1/2. In the regime of long- term monitoring the Earth strains the interferometer is operating from the beginning of 1993. The observation data, thanks to the unique capabilities of the laser interferometer with respect to both the frequency and the dynamic ranges, are used for studying some geophysical and astrophysical problems.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vadim K. Milyukov, Vadim K. Milyukov, Valentin N. Rudenko, Valentin N. Rudenko, B. S. Klyachko, B. S. Klyachko, A. M. Kart, A. M. Kart, A. V. Myasnikov, A. V. Myasnikov, "Wideband laser interferometer for monitoring the Earth strains", Proc. SPIE 3682, Laser Optics '98: Solid State Lasers, (29 December 1998); doi: 10.1117/12.334779; https://doi.org/10.1117/12.334779
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