Aller au compte twitter


Participants hors IPGP : 
ESEO: G. Plantier, M. Feuilloy, R. Féron

2017- 2019 High Performance Optical Seismometer 

We propose the development and  demonstration  of an innovative, high resolution, low-cost optical (laser) seismometer aimed at improving the real-time  monitoring for  regions with high telluric hazard (earthquakes, volcanoes, landslides, tsunmais...), as well as  for  areas of  industrial underground exploration, production and storage  (geothermy, oil, gas, deep mines, CO2 and nuclear waste storage,..), for safety as well as  production objectives. In the LINES (2009-2012) ANR project, we  successfully developed a high resolution optical  seismometer prototype on a 3 km long optic cable, based on a 2 Hz commercial geophone and on Fabry-Pérot interferometry. However, further R&D is requested, for entering the  industrial market of seismometers, with the ambitious objective of combining  miniaturization (<4 cm), resistance to high temperature (250°), average floor noise at less than  2  nanog/sqrt(Hz) in  the 1-20 Hz range, omnidirectional (no requested levelling), low cost, and low power.  Such an instrument is not yet proposed by the geophysical indutry.  This requires new coupled designs in the mechanics, optics, and algorithmics.


HIPERSIS is proposing the  Research and Development above, involving two  partners of the former LINES ANR project:  IPGP, with experts in  seismology and seismometry,  which will develop the mechanical oscillator  and the integration of the optical part; and ESEO, a private engineering school and research institute,  with experts  of signal processing and electronics, which will design new algorithms and in particular integrate and correct for specificities of the mechanical device (resonance, damping, non linearities). At IPGP, several  prototypes  will be designed,  constructed and tested, aiming at an optical and mechanical amplification of the signal of at least a factor of 5. In particular, the efficiency of a double measurements for common mode rejection will be  studied, as well as the sensitivity of the fiber itself  to vibration.  A first qualification of the integrated sensor will be done in  the  low-noise underground laboratory of LSBB (Southern France). Valorization will start after the first year,  with the preparation of  application projects for microseismic monitoring  in the industrial and academic sector.