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The lines high resolution optical seismometer
- Source :
- EAGE/DGG Workshop on Fibre Optics Technology in Geophysics (EAGE/DGG 2017), EAGE/DGG Workshop on Fibre Optics Technology in Geophysics (EAGE/DGG 2017), Mar 2017, Postdam, Germany. 2017, EAGE/DGG Workshop 2017, EAGE/DGG Workshop 2017, Mar 2017, Potsdam, France. ⟨10.3997/2214-4609.201700166⟩
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- We present here the performance of an innovative, high resolution, robust, and low-cost optical seismometer. The instrument was developed within the LINES project ( ANR, 2009-2012), and tested at the low noise underground laboratory of LSBB (France). It is based on a Fabry-Perot interferometry between the extremity of a laser fiber and a reflecting mirror fixed on the mobile mass of a passive geophone (2 Hz ). At the other extremity of the fiber, 3 km long, an optical system includes a laser diode (1310 nm) and the recording and control systems. A double modulation (at 50 KHz and 1 KHz ) of the intensity of the diode current produces a wavelength modulation, allowing to calculate in real-time the position on the mass, thanks to fast and innovative numerical processing. It ran more than two years, recording many teleseismic earthquakes and a few regional ones. It resolves the low seismic noise of the Earth for periods as low as 5 s, and presents an acceleration floor noise lower than 1 ng/sqrt(Hz) in the 0.2-5 Hz range. The LINEs optical seismometer is thus a promising instrument for the microseismic monitoring of deep and/or hot industrial boreholes.
- Subjects :
- Seismometer
010504 meteorology & atmospheric sciences
Laser diode
business.industry
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]
Geophone
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Seismic noise
010502 geochemistry & geophysics
01 natural sciences
7. Clean energy
law.invention
Interferometry
[SPI]Engineering Sciences [physics]
Optics
Modulation
law
business
[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing
Noise (radio)
Geology
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Diode
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- EAGE/DGG Workshop on Fibre Optics Technology in Geophysics (EAGE/DGG 2017), EAGE/DGG Workshop on Fibre Optics Technology in Geophysics (EAGE/DGG 2017), Mar 2017, Postdam, Germany. 2017, EAGE/DGG Workshop 2017, EAGE/DGG Workshop 2017, Mar 2017, Potsdam, France. ⟨10.3997/2214-4609.201700166⟩
- Accession number :
- edsair.doi.dedup.....0f412f52fe1ca57554b676c0920bd505